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Home My WebLink AboutAPA861EXAMINATION OF SUSITNA RIVER DISCHAHGE AND TEMPERATURE CHANGES OUE TO THE PROPOSED SUSITNA HYDROELECTRIC PROJECT SUSITNA HYDROELECTRIC PROJE·CT FEDERAL INeRGY ReGULAlORY COMMI8SION PROJeCT No.7114 u -LD """"""",0) ~ ~(\')---.q ~.q :g==o"-0c==o _LD ~LDr--. -(\') ~M "-.------1 UNIVERSITY OF ALA8KA ARCTIC ENVIRONMENTAL-' INFORMATIOH AND DATA CENTER UNDeR ~ONTRACT TO oo~rra~~~~~~®©© SUSITNA JOINT VENTURE FINAL REPORT FEBRUARY 1884 DOCUMENT No.841 1 SUSITNA HYDROELECTRIC PROJECT Document No.861 IK 14;;'0 ,~~ fLt-:=r~ nt),Yo{ EXAMINATION OF SUSITNA RIVER DISCHARGE AND TEMPERATURE CHANGES DUE TO THE PROPOSED SUSITNA HYDROELECTRIC PROJECT - Report by Arctic Environmental Information and Data Center Under Contract to Harza-Ebasco Susitna Joint Venture Prepared for Alaska Power Authority UNIVERSITY ARcTiC ENVJRONMENi' AND DAT/~ 707 A ST~ff!r ANCHORAGE,AK -Final Report February 1984 ~-------------_._-- ..... - .... NOTICE ANY QUESTIONS OR COMMENTS CONCERNING THIS REPORT SHOULD 8E DIRECTED TO THE ALASKA POWER AUTHORITY - ..... ..... - .... l.!') 0) 00 (Y) ~ ooo l.!') l.!') r-.... (Y) (Y) This report was prepared by the following AEIDC staff William J.Wilson,Principal Investigator Paul R.Meyer,Hydrologist Ken A.Voos,Ph.D.,Environmental Engineer Beverly J.Valdez,Information Coordinator Charles G.Prewitt,Ph.D.,Fisheries Biologist TABLE OF CONTENTS LIST OF FIGURES 'INTRODUCTION.... .. .. .. .. .. ..... .. .. .. .. .. .. .. .. .. .. .. ...... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ...•.. .. .. .. .. .. .. .. .. .. .. .. .. ..1 .-. - ".... - PROJECT BACKGROUND ••••••••• APPROACH OF THE STUDy •••••• ]~ETHODS .. Dr SCHARGE .. Pre-and Postproject Flows •.••••• Statistical Testing •.•••••••••••• TE~ERATURE .. Initial Temperatures at Cantwell t Chulitna and Talkeetna .. Reservoir Release Temperatures ••••••••.••••••••••••• Selection of Conditions Producing Normal and Extreme Temperatures...... ...... .. .. .. .. ...... Postproj ect Simulations .. RESULTS AND DISCUSSION. DISCHARGE e-.. Single-Dam Scenario (Watana Only). Two-Dam Scenario...................... TEMP ERATURE.... .... .... .. .... Postproject Simulations..•••••.• Watana Filling ••••••••••••.•• Operational Scenarios ••••.••• S~y .. REFERENCES .APPENDICES A.FLOW STATISTICS FOR THE SINGLE-DAM SCENARIO B.FLOW STATISTICS FOR THE LOG-TRANSFORMED DATA t SINGLE-DAM SCENARIO C.MONTHLY FLOW PROFILES FOR NATURAL AND SINGLE-DAM OPERATIONAL CONDITIONS D.FLOW STATISTICS FOR THE TWO-DAM SCENARIO E.MONTHLY FLOW PROFILES FOR NATURAL AND TWO-DAM OPERATIONAL CONDITIONS F.NATURAL RIVER TEMPERATURE PROFILES FOR NORMAL AND EXTREME CONDITIONS 1 2 3 3 3 6 9 9 11 13 13 15 15 15 17 20 20 20 24 24 - 1?igure No. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. LIST OF FIGURES Region of present temperature study,Cantwell gage to Sunshine Station Regression model-predicted initial temperatures (C) with 95%confidence intervals. Regression model-predicted initial temperatures (C) for June to September 1980. Estimated mean monthly summer reservoir release temperatures. SNTEMP-predicted temperatures (C)and rank of the mainstem Susitna at Talkeetna Station for June through September,1968 through 1982. Project-related flow changes,I-dam scenario Project-related flow changes,2-dam scenario River temperature profiles for second year of filling Watana reservoir (2 pages). River temperature profiles for natural and I-dam operational conditions (2 pages). River temperature profiles for natural and 2-dam operational conditions (2 pages). Page No. 4 10 12 12 14 18 19 21 25 27 ..... - EXAMINATION OF SUSITNA RIVER DISCHARGE AND TEMPERATURE CHANGES DUE TO THE PROPOSED SUSITNA HYDROELECTRIC PROJECT INTRODUCTION PROJECT BACKGROUND The Alaska Power Authority is proposing to construct a 1620 megawatt hydroelectric project on the Susitna River,approximately 120 miles northeast of Anchorage,Alaska.Licensing of this project by the Federal Energy Regulatory Commission (FERC)requires,in part,that the Power Authority provide an analysis of the environmental effects of the project including a description of the present conditions,an evaluation of expected impacts,and proposals to mitigate those impacts. The Susitna project aquatic resources impacts are expected to result primarily from changes in Susitna River discharge and temperature patterns. In general,these effects are expected to be reduced summer streamflow and increased winter streamflow relative to preproject conditions.Summer stream temperatures downstream from the project are expected to be cooler and winter temperatures warmer than those currently recorded (APA 1983). The aquatic impact assessment program is designed primarily to predict \ aquatic impacts at study sites selected to represent similar areas which cannot be intensively studied because of cost or time constraints.Central to this type of assessment is the delineation of pre-and postproject discharge and temperature effects in terms of their expected magnitude and significance to aquatic organisms. It is therefore necessary,when proposed project configuration is finalized,to determine the magnitude of expected proj ect changes (in this case discharge and temperature)from the project location to the downstream -1- - - point at which effects may no longer be considered significant.In so doing, two things are accomplished:first,the stream reaches or segments within which discharge and temperature are homogeneous are determined and serve to stratify the river prior to assigning study site impacts to larger unstudied areas;second,physical bounds are put on the reach of river where discharge and temperature changes are significant,and thus within which impact studies should be concentrated. APPROACH OF THE STUDY In this paper proposed mainstem Susitna flows resulting from project operation are examined in relation to natural flows.Attempts are made to identify reaches of the river where postproject flows are statistically indistinguishable from natural flows.We believe that flow-related aquatic impact issues cannot be addressed in areas of the river where natural and operational flow regimes are statistically the same. Temperature variations are addressed by comparing natural stream temperatures with downstream temperatures resulting from proj ect operation. We feel it desirable to show natural and postproject temperatures expected during normal and extreme meteorologic/hydrologic conditions.To do this, those summer periods which resulted in the normal,maximum and minimum stream temperatures under predevelopment conditions were selected from stream temperature simulations which used historical meteorology and hydrology data. The data from these three selected summer periods (1970 for the minimum,1980 for the normal and 1977 for the maximum)were combined with postproject modifications to compare the difference between predevelopment and postproject stream temperatures.The postproject simulations will,therefore,represent -2- the range of temperatures expected under natural variations in hydrology and meteorology. The sparcity of daily discharge and water temperature data in the Susitna basin dictates the use of monthly timesteps for most simulation modeling. Data for large time steps are expected to mask some short-period variations, thus conclusions drawn from these monthly simulations must be made with caution.Simulations are presently underway using weekly time periods in -, - which greater short-term variations are expected to appear.This second round of simulations is also being done on a yearly basis,whereas only summer periods (June through September)have been addressed in this report. Thoughout this report the terms "natural flow"and "preproject flow"are used synonomous1y in reference to the estimated flow regime of the Susitna River which occurred since record-keeping began with water year 1950.These estimated flows are a composite of the flows recorded at USGS gage stations in the basin and the statistically-generated flows developed by APA (1983)to fill gaps in the record. METHODS DISCHARGE Pre-and Postproject Flows Preproject mean monthly discharges for the Susitna River downstream from the Watana dam site (Figure 1)were estimated using the statistically-filled streamflow datal given in the FERC license application (APA 1983)and a water balance computer program (H20BAL)developed by AEIDC.The H20BAL program - (AEIDe 1983)computes contributing tributary inflow to the Susitna River from small subbasins based either on watershed area or precipitation-weighted 1.A mu1tisite regression technique was used to analyze existing monthly streamflow data and fill in periods of missing record for the USGS stations within the basin (APA 1983). 1 1 J -1 J 'I J J Figure 1.Region of present temperature study,Cantwell gage to Sunshine Station. I +'- I ~ ~. ~.' ..' ",' "ORTH ----.fORI< ~ kASHWlr",A <9,,, ~<9 e USGS GaU.SIQlioli 100m 51 •• SUSITNA RIVER Cantwell to Kashwilna River Scole 1";:8"'1111 watershed area.From this,mainstem flows are determined for a number of locations.The watershed area weighting method was used for these simulations.This was done to maintain as much consistency as possible with the methods previously employed by Acres American,Inc.It should be - ...... emphasized that since the H20BAL program only generates mainstem flow data for locations between gage stations,flows used in this report for gage locations (Gold Creek,Watana,Chulitna,Talkeetna and Susitna Station)are consistent with those appearing in the license application.The only exception is at Sunshine Station,where flows available in the license application sometimes result in negative inflows when water balancing.Flows at this station were determined by -Qs =~1::-::1=0,=,,00~._ 10736. - where QS'QGC'QT'and QC refer to flow at Sunshine Station,Gold Creek,Talkeetna,and Chulitna,respectively, 11000.is the area (mi 2 )of the watershed defined at Sunshine Station,and 10736.is the area (mi 2 )of the summed watersheds defined at Gold Creek,Chulitna,and Talkeetna gages. ..- Employing H20BAL results in the reconstruction of Susitna River mean monthly streamflows for the water years 1950 through 1981 at all gage stations and significant tributary confluences from the Watana dam site to Susitna Station,26 miles from the river mouth at Cook Inlet.Postproject streamflows can be predicted at the same locations using the 32-year postproject flows at -5- ,~ the Watana dam site (one-dam scenario)or the Devil Canyon dam site (two-dam scenario)as simulated by the ACRES reservoir operation models.These models provide release discharge estimates after simulating power production based on the dimensional properties of the dam(s).One model simulates Watana dam only,while another simulates conjunctive operation of both Watana and Devil Canyon dams. The reservoir operation schedule presented in the Application for FERC License (APA 1983),the "c"scenario,was analyzed in this report.This - scenario is indicated in the License Application (APA 1983)to balance the cost of impact mitigation measures and loss in net economic benefits.It reflects the minimum flow demand at Gold Creek for 6000, 6480,12000 and 9300 cubic feet per second (cfs)respectively in June,July,August and September for fishery purposes. Operational flows expected during the summer of the second year of filling the Watana reservoir were also simulated.This period is of special concern due to the cold (4 C)water that would be released from the lower level dam outlet during this season (APA 1983).Minimum releases me~s:ur~d1i.t. Gold Creek for the summer filling period are 6000,6480,12000 and 9100 cfs for June,July,August and September respectively (APA 1983).During some years,enough water is available from tributary inflow between Watana and Gold Creek to meet this requirement without releasing any water from the reservoir. For such cases,a minimum Watana release of 1,000 cfs has been specified (APA 1983). Statistical Testing The statistical analysis of the 32-year flow series is used to describe the flow regime for the natural and operational scenarios at a given mainstem -6- location and,if possible,to determine the point downstream from the project where operational flows become indistinguishable from natural flows.All statistical methods used are described in this section although initial statistical results determine which,if any,additional testing is done on the data. In testing for statistical significance,the pre-and postproj ect flow series at each mainstem node location are considered as samples of distinct tributaries will dampen the differences between natural and operational flows.- flow populations.Moving downstream from the lower reservoir,inflowing ~ I - During months where reservoir releases do not differ greatly from natural flows at the dam site,it is reasonable to expect that the 32-year sample of operational flows would become statistically indistinguishable from the sample of natural flows at some point downstream. Ideally,if both natural and operational flow series approximate normal distributions at each node location for a given month,testing for significant differences at mainstem locations progressing downstream is relatively straightforward.The statistical test that can be used in this case is a comparison of population means with both population variances unknown and not assumed equal (Johnson and Leone 1964).The test statistic has a distribution approximating a Student's t distribution with 31 degrees of freedom. Yevjevich (1972)suggests two criteria for determining whether or not a normal function should be applied to an empirical distribution.These requirements incorporate the skewness (a measure of symmetry)and kurtosis (a measure of peakedness)of a distribution through the skewness coefficient c ,and the excess coefficient,C •s e For normally distributed populations, both parameters equal O.The population a sample is drawn from can be - considered normal if it meets the following requirements: -7- by -0.2 <C <0.2 ands -0.5 <C <0.5.e The skewness coefficient is approximated for a small sample (Chow 1964) Cs =n (n-l)(n-2) n E (X.-X)3 1 =1 1 -where n =the sample size ( = 32), the monthly flow during the th for givenX.=mean i year a 1-site and month, X =the mean of the n monthly flows at a given site. -The coefficient of excess (Yevjevich 1972)is determined by C =e 2n (n-l)(n-2)(n-3) n 1:(X.-X)4 1=1 1 - 3 .- - where variables are as above • When data fails to meet these requirements,Yevjevich gives two options: fit the data to another distribution or transform the variable values to fit a normal distribution.Frequently,discharge data series are positively skewed due to extreme high-flow events.In these cases,replacing flow values with the logarithm of flows may normalize the series and has a justifiable -8- !~ hydrologic basis (Chow 1964).This is only useful~however.if both pre-and postproj ect flow distributions are positively skewed.When this is not the case.no further statistical manipulation is attempted here.For flow series that fit the transformed lognormal distributions (using the Cs and Ce values of the transformed data).the test for significant differences can be performed. An additional statistical parameter of a 'sample distribution which fi appears in the tabular output is the coefficient of variation. simply the standard deviation divided by the mean. TEMPERATURE Initial Temperatures at Cantwell.Chulitna and Talkeetna C •v This is To begin a natural condition temperature simulation.starting I""" i temperatures are required for the Susitna'River at the Cantwell gage and the Chulitna and Talkeetna rivers at the USGS gages near the town of Talkeetna. When these data are not available.initial temperatures are synthesized by (l)using SNTEMP to compute an equilibrium temperature for the period of missing data.and (2)using this calculated equilibrium temperature to estimate an initial water temperature from a regression model developed from observed water temperatures and calculated equilibrium temperatures (AEIDC 1983).The reliability of these regression models restricts the accuracy of the physical process temperature simulations.For example.if the regression model for the Cantwell gage predicts an initial temperature of 8 C when the actual stream temperature was 7 C.this one degree overprediction would cause overprediction throughout the simulated length of river.The temperatures predicted with the regression models and the 95%confidence intervals for individual stream temperature values are presented in Figure 2.The -9- 1 ----1 1 1 J ')I J 1 J I Figure 2.Regression model-predicted initial temperatures (C)with 95%confidence intervals. SUSITNA RIVER AT CHULITNA RIVER TALKEETNA RIVER CANTWELL USGS GAGE AT USGS GAGE AT USGS GAGE ......... T 95%T 95%T 95% Confidence Confidence Confidence Interval Interval Interval 1970 (minimum) June 7.97 +1.38 6.48 +2.35 7.85 +5.79 July 8.90 +1.40 6.87 +2.38 5.17 +6.28 August 7.47 +1.39 6.27 +2.38 6.70 +5.89 September 3.81 +1.82 4.44 +3.62 1.37 +8.19 I 1977 (maximum)I-' 0 June 11.12 +1.61 7.39 +2.57 10.88 +6.36I July 10.60 +1.54 7.69 +2.74 11.71 +6.70 August 9.22 +1.41 7.21 +2.48 10.23 +6.14 September 5.35 +1.57 5.16 +2.98 3.69 +6.89 1980 (average) June 8.68 +1.39 6.54 +2.35 8.18 +5.79 July 10.20 +1.50 7.47 +2.61 10.88 +6.36 August 8.28 +1.38 6.53 +2.35 7.91 +5.79 September 5.22 +1.59 4.89 +3.20 3.19 +7.14 T =predicted temperature - .... .... ~- difference in the level of confidence among the three regression models is a result of the number of data points available for computing mean monthly temperatures and the type of data collected.Continuous data was collected at Cantwell gage for June to September of 1980 and 1982,continuous data was collected at Chulitna gage in 1982 with grab samples in 1980,and only grab samples were available at Talkeetna gage for June to September of 1980 and 1981.Comparisons between the observed and regression model-predicted temperatures for 1980 (representing a normal year)are presented in Figure 3. Reservoir Release Temperatures Presently,reservoir release temperature estimates are very sparse.The reservoir thermal model,DYRESM,has been run for both reservoirs only for 1981 conditions (APA 1983).We have estimated mean monthly release temperatures (Figure 4)from the continuous thermograph output from these runs.Since reservoir outflow temperatures are expected to vary from year to year due to differences in meteorology,hydrology,available reservoir storage and power requirements,applying thesetemperatures_too_tberyearsmaynot be representative.Consequently,downstream temperatures were simulated under operational conditions for only one year (1981). Release temperature estimates for the second year of filling the Watana reservoir have been made without DYRESM simulations.Until the reservoir level rises to where the normal (upper)outlet facilities can be used (estimated as late summer or fall of the second year of filling),releases are restricted to the lowest outlet facilities (APA 1983).A water temperature of 4 C is expected at the level of this outlet and thus was used for simulating under cold,normal and warm temperature conditions.The selection of these representative conditions is discussed in the following section. -11- 1 1 ..~)1 J »1 I 1 ]i 1 1 j Figure 3.Regression model-predicted initial temperatures (C)for June to September 1980 SUSITNA RIVER AT USGS CANTWELL GAGE' CHULITNA RIVER AT USGS GAGE TALKEETNA RIVER AT USGS GAGE MONTH June July August September T 8.68 10.20 8.28 5.22 Tabs 8.5 10.0 9.0 4.5 n 31 30 30 31 T 6.54 7.47 6.53 4.89 Tabs 6.8 7.1 n 1 1 o o '"''f 8.18 10.88 7.91 3.19 Tabs 8.3 8.8 n o 1 1 o I l-' N I T =predicted temperature Tobs =observed temperature,computed as average of mean daily temper~tures, n =number of days of observed temperature data Figure 4.Estimated mean monthly summer reservoir release temperatures (C) (based on 1981 DYRESM results,ACRES 1983) June July August September Watana (1 dam)7.7 9.5 8.7 8.3 Devil Canyon (2 dams)6.0 7.2 6.7 7.5 - Selection of Conditions Producing Normal and Extreme Temperatures The Susitna study application of the stream temperature model,SNTEMP (AEIDC 1983),was used to estimate the range of natural temperature variations in the mainstem Susitna River from the USGS Cantwell gage station to Talkeetna Station just above the Chulitna confluence (river mile 103.0,site of the Talkeetna fishwhee1).Mean monthly river temperatures were calculated for the summer months (June through September)for the fifteen-year period of readily available meteorology data,1968 through 1982.Meteorology data from Talkeetna (U.S.National Climatic Center 1968-1982)and recorded and statistically-filled flow data (APA 1983;R&M 1982a,1982b)were used. Predicted mean monthly Susitna River temperatures at Talkeetna Station for the fifteen-year summer period are shown in Figure 5.The ranking - - (coldest to warmest)for each month as well as the overall seasonal ranking are also given in this figure.In the case of two years having the same monthly temperature (July 1972 and 1975),equal ranks (averaged)were assigned. The three years chosen from these rankings to represent cold,normal and warm temperature conditions were 1970,1980 and 1977 respectively.1981 was eliminated from consideration as the normal year due to the variation in June .-and July temperatures (warm June followed by a cold July).These years represent the normal and extremes in seasonal water temperatures,a product of both meteorology and hydrology for that period. Postproject Simulations Projected reservoir release flows and temperatures were used as initial conditions for simulating the downstream temperature effects of filling and operation of the dams.For the second year of Watana filling and the Watana-on1y operational scenarios,the simulated river reach begins at the -13- -J --J ---,1 i 1 J I "I 1 B I 1 J Figure 5.SNTEMP-predicted temperatures (C)and rank of the mainstem Susitna at Talkeetna Station for June through September,1968 through 1982. Av.Av.Seasonal YEAR JUN Rank JUL Rank AUG Rank SEPT Rank Temp Rank Rank 1968 10.52 13 12.58 13 11.46 13 6.44 7 10.25 11.5 13 1969 10.45 10 11.83 10 9.52 4 6.80 12 9.65 9.0 9 1970 8.75 4 10.27 1 9.06 2 5.10 2 '8.30 2.25 1 1971 9.00 6 10.64 4 10.30 9 5.77 4 :~iL 93 5.75 5 1972 7.75 1 11.64 8.5 10.05 7 4.87 1 8.57 4.38 3 1973 8.65 3 11.03 5 8.64 1 5.15 3 8.37 3.0 2 1974 9.79 8 10.60 3 10.02 6 6.41 6 9.20 5.75 6 1975 8.52 2 11.64 8.5 9.40 3 6.07 5 8.91 4.62 4 1976 10.73 14 12.78 14 11.20 10 6.55 9 10.32 11.75 14 I 1977 11.61 15 12.95 15 11.50 14 6.88 13 10.74 14.25 15l-' +:-1978 10.50 12 11.84 11 11.29 11 7.13 14 10.19 12.0 11I 1979 10.00 9 12.09 12 11.37 12 7.76 15 10.23 12.0 12 1980 8.97 5 11.57 7 10.27 8 6.61 10 9.36 7.5 8 1981 10.46 11 10.40 2 9.95 5 6.52 8 9.33 6.5 7 1982 9.77 7 11.38 6 11.53 15 6.71 11 9.85 9.75 10 """", Watana dam site.For the two-dam scheme,the simulated reach is shortened to begin at the Devil Canyon dam site. The three years selected to represent normal and extreme summer water temperature conditions were used to define the range of expected effects. Basin flow and meteorology data for these three periods were used with the corresponding projected reservoir release flows and temperatures.Since river water temperatures are functions of both hydrology and meteorology,both these data sets were used together for a given year. RESULTS AND DISCUSSION DISCHARGE Single-Dam Scenario (Watana Only) Tabulated statistical results comparing natural mainstem Susitna flows with single-dam operational flows are given in Appendix A.Attempts to ,.... determine reaches where operational flows show statistically significant differences from natural flows were unsuccessful.This was due to the ,....variations in the shape of the sample distributions with respect to natural versus operational flow samples,and in the consistency of flow distribution shapes at node locations progressing downriver. As mentioned previously,sample distributions of operational flows must be similar in shape to those of natural flows for the proposed test of significance.Additionally,the distribution shape must remain consistent progressing from node to node downriver.Since the observed results did not meet these requirements,significance testing of the differences between flow distributions could not be done. There is a trend of the natural flow distribution toward positive skewness.Nine months showed C values at most node locations greater thans 0.2;one month showed a symmetric distribution (May).and only two months -15- .- (October and January)showed negative skewness.Dam operations tend to reduce the positive skewness during winter months and increase positive skewness during the summer.Five monthly flows,including December through March, reversed skewness coefficients to the negative (C s <-0.2)under project operation.For the four summer months (June through September),operational flows remained positively skewed.Reservoir operations,while specifying minimum summer flow requirements to facilitate fish usage,also tend to capture higher flows for winter releases.The result is elimination of ..- extreme flows in both directions (high and low),increasing kurtosis as reflected in the coefficient of excess values • There is a tendency for variation in both skewness and kurtosis when moving downstream.This appears to be due in large part to the effects of the larger tributaries.These tributaries generally do not respond in concert with the upper Susitna River;hence,the shape of the mainstem flow distribution is often altered significantly at the confluence of these rivers. Additionally,there was a tendency for increased positive skewness in the lower riverreach.-.near ..and be.1owthe.Yentna confluence.This effect is seen both in natural and postproject flows. Since the four summer months showed the greatest consistency in the shape of natural and operational flow distributions,and as these months are of greatest concern,the same statistics were run on the flow data after a log transformation (results in Appendix B).Improvement in the Cs and Ce values was not sufficient to warrant significance testing of these transformed values. Perhaps the most useful result presented in Appendix A appears under the "%CHANGE"column.This value is determined by postproject flow -preproject flow preproject flow -16- - - - - - -- and is given for each node location. Flow augmentation under proj ect operation occurs during seven months, October through April.For the four midwinter months (December through March),this augmentation exceeds 100 percent as far downstream as Susitna Station.The remaining five months undergo flow deficits,the most substantial during June and July.The absolute flow increase for any location downstream from the Watana damsite and the relative change in flows at Gold Creek,Sunshine and Susitna Station are shown graphically in Figure 6. Profiles comparing natural and single-dam operational flows for each month are shown in Appendix C. Two-Dam Scenario Mainstem river flows resulting from operation of the two-dam system differ only slightly from that of single-dam operation (statistical results in Appendix D).In general,differences between natural and post-construction flows become more severe with addition of the Devil Canyon dam.When comparing results in the tabular output,the node at "CHINCHEE"for the single-dam case corresponds to the "D.C.DAM"node in the two-dam scenario. For the six month winter period,November through April,the flow augmentation seen under the single-dam scheme is increased slightly.For the May through August period,there is slightly less mainstem flow than under single-dam operation and,consequently,greater flow deficits.The only diversion from this pattern of more severe flow differences occurs in September and October when flow regimes are slightly closer to natural conditions.There is less of a flow deficit in September and slightly less augmentation in October.Figure 7 shows a graphical representation of the absolute changes in flow at any location downstream from the Devil Canyon dam -17- -- Figure 6.Project-related flow changes,I-dam scenario. Absolute flow increases with dam operation,systemwide IllD .......... 5&- .. "- .. + -5IllI9 - + -ISll01J .... OCT JAN FEB APR MAY .. JIJN .. SEP Relative change in postproject over preproject flows at three sites IIN:REASE GllJl CREEK 1BrJ o !DSIll£ STATlIJl 0\ 411I SUSITNA STAflllll ..3lIl 111I I -111I L_'------A-l-1--~T OCT JAN FEB -18- MAY JlIl JU.SEP Figure 7.Project-related flow changes,2-dam scenario. Absolute flow increases with dam operation,systemwide r .,.., IBm1B • • -58 I- -lmmB I- -15ll1l11 - OCT • DEC • JAN • FEB • MAY • JtJl • • SEP Relative change in postproject over preproject flows at three sites %IIOEASE ClllI CREEK 7. D 6lII - 5l.DlSIliNE STATIm SIllA .tlIl SlJSITNA STATlIll +D 311 .1111 III -1111 L--------l-l-l--~T OCT JAN FEB IOITH !lAY JIl.SEP -19- - site due to the paired dam operation (positive when postproj ect flows are greater than natural flows).The percent change in postproject flows over preproject flows for Gold Creek,Sunshine and Susitna Station mainstem locations are also shown on this figure.Patterns of skewness and kurtosis for natural and operational flows were similar in this case to those in the single-dam case.Consequently,testing for river reaches with significant flow differences was not pursued.Flow profiles of natural and two-dam -- ..- i .... I -I .... operational conditions are shown in Appendix E. TEMPERATURE Postproject Simulations Watana Filling.The downstream effects of the second year of filling Watana reservoir were simulated using the three selected years representing normal and extreme conditions.These simulations are of special concern due to the potential impact of 4 C release waters on the fishery resources.Four monthly temperature profiles (June through September)for the three years appear in Figure 8• These profiles show conditions from the proposed Watana dam site to Sunshine Station below the confluences of the Chulitna and Talkeetna rivers. The projected filling flows and temperatures were used to initialize the temperature model.The expected normal,cold and warm temperature profiles are presented along with the minimum (1970)and maximum (1977)natural conditions (banded area)for comparison.The temperature discontinuity at river mile 98 represents the influence of the Chulitna River (instantaneous mixing is assumed).The smaller discontinuities throughout the simulated length are a result of the smaller tributaries mixing with the Susitna River. Note that the cold natural hydrology/meteorology does not always result in the minimum temperature profiles for filling conditions;conditions -20- Figure 8.River temperature profiles for second year of filling Watana reservoir.Shaded band represents range of simulated natural temperature conditions. SUSITNA WATER TEMPERATURES,JUNE Year 2.Watana Filling Flowe TElIPERh TURE (C) 29 Cold 1970 Normal 15 1900 Warm 1'J77 10 -.-_.------.---..---.;;::;--.-----.---~-;;::;;--:::::-- 5 ..,..i"....~..........u ...."".....""......a ..."~~0 '"t:l u 0 1911 1811 1711 160 1511 149 131\129 110 l011 90 80 DISTANCE 00 SUS ITNA WATER TEMPERATURES,JULY __Yeel"2.WOta1Cl Filling Flowe TElIPERA TURE (0 2Il Cold 19711 Normal 15 1980 ..... ..... .... 10011012lJ 5 ,.>I """.........u c:"..""..a .......0:O:Q t.:l 0 19a 18a 1711 loll 150 140 131\ Warm 1977 lil- ..... DISTANCE ()I) .....Figure 8 (Continued).River temperature profiles for second year of filling Watana reservoir.Shaded band represents range of simulated natural temperature conditions. SUSITNA WATER TEMPERATURES,AUCUST Year 2.Vatana Filling Flaw.. TEMPERATURE (Q Cold 1970 SUSITNA WATER TEMPERATURES,SEPTEMBER 5 .. '"0 .w>.........~...~..l;..~...u .....'"...... ....'"...~9 ............."t g 8 ti~~~g 0 100 1811 170 160 150 140 130 1211 110 100 00, DISTANCE 00 Normal 15 19811 ---- Warm 1977 10 -.--.- ..... .... Y..""2.Vatana Filling Flaw.. TEMPERA lURE (D Cold 1970 Normal 15 1980 ._--- Warm 1977 10 --_._- 5 ............j,o ~...U.."'to .....a ....~~0'" 190 1811 170 161l 150 140 130 120 110 01 STAIICE (Ml -??- ,... representing June 1970 resulted in a warmer temperature than those produced by the normal (June 1980)condition.This is a result of two factors.First, combinations of meteorology and hydrology were selected for seasonal (sequential June to September)normal,cold and warm temperatures.Thus,even though the natural temperatures expected for June 1970 were lower than the temperatures of June 1980 (refer to Figure 5 and the temperature profiles for natural conditions,Appendix F),June 1970 was not the minimum June and June 1980 was not the average June.We selected seasonal conditions as an initial approach to best represent natural events;we would not expect the coldest June to be followed by the coldest July,August and September. Second,we have used combinations of existing hydrologic conditions with existing meteorologic conditions.Again,this approach was selected to be more representative of natural events,rather than mixing hydrologic and meteorologic conditions to form a synthetic data set.This appears to be responsible for a number of interesting results.Downstream temperatures -I - simulated under the filling scenario for June 1970 were higher than those for June 1980.The larger tributary inflows during 1980 apparently keep mainstem temperatures low,even though the 4 C reservoir flow release was higher during June 1970 than during June 1980.A similar anomaly appears in July when the normal condition year (1980)produced the warmest temperatures. Two additional points are brought out in the results of this scenario. The impact of the tributaries on the mainstem is significant,especially in June.The cooler waters of the tributaries and the lower flows in the mainstem combine in their effects to result in a slow recovery to natural conditions.Reduction in the range of temperatures expected downstream is also significant.The temperature profile produced during the second year of filling will fall within a narrow band relatively independently of the hydrology and meteorology occurring during that year. -23- r Operational Scenarios.Since reservoir release temperatures are available for only one year and as there is no appropriate technique for estimating release temperatures short of using a reservoir temperature model,we were limited to simulating one-dam and two-dam effects for the single year for which the simulated reservoir release temperatures were available.This has several ,.,... ...... r r- I .- ..- shortcomings.With only one year of simulation,no estimate of the range of effects is available.Additionally,the year for which the reservoir release temperatures are available (1981)was a normal year based on the seasonal average (seasonal rank was 7 of 15,see Figure 5)but was composed of a warm June (rank =11)and a cold July (rank =2).Thus the downstream temperatures predicted using the 1981 meteorology and hydrology will not represent average conditions for June and July.The simulations for Watana-only summer season operation are presented in Figure 9 and the Watana plus Devil Canyon operation are presented in Figure 10. These simulations imply that there will be observable temperature differences below the Chulitna and Talkeetna confluences.Interpretation of these results should be made with consideration to the low accuracy available from the Chulitna and Talkeetna initial temperature regression models (refer to Figure 2).Fortunately,the regression model for the Chulitna River,which has more influence due to greater flow,is more accurate than the Talkeetna model (AEIDC 1983).As previously stated,1983 field season data will improve the accuracy of these regression models • SUMMARY An analysis was done comparing the natural flow regime of the Susitna River with those expected under operation of a single dam (I.J'atana)and a two-dam project.This provides a direct comparison of operational flows with -24- - Figure 9.River temperature profiles for natural and i-dam c?erational conditions. SUSITNA WATER TEMPERATURES,JUNE NATlRAl.NIl l-11A11 IFERAT1001. llGREES (0 - .. -l~-'---f-------~- f- -"'I.-t--.-- f--. "~0 "">.III III e III '"...'"III ..e"'....u ...u ~e In .... '"....In ":l .......E!.......:>'"'">E!0 .r=~Q III '"t.'l U I I I 1'<:1 I I I I I f I""" I -r i 5 II III 1811I 179 lfilrJ ISIl 14B 1311 122 lIB Ifill IEREES CO [IlSTANCE 011) SUSITNA WATER TEMPERATURES,JULY NATlRAL ANI HlAil (l'ERATlCllAL, 5 II r- I- r----"=-r-----------1-""'------'- L--- f- l- e 0 .:.:>.IIIIII"III...'"III ..'"....u ...u "In .... '"....<II ":l...B ......... ~~>a 0"'"t.'l I 1 I ~Q.I I I !I I 1!1l 1811I Hill 158 14ll 1:11 1211 liB Ifill DlSTAIIl:am ~ -Figure 9 (Continued).River temperature profiles for natural and I-dam operational conditions . .'SUS ITNA WATER TEMPERATURES,AUGUST NAl1.RAI..00 1-lIAM 1FEIIA1IOOL NA'II.IlAL 1981 I-DAM II'ER. 1981 IS III 5 II f0- r- f0- r-1_......."--'---=----::::::!-------=- r- e '"0 "">."<II e ""...ra ~...e......uu u """"........ ".....,""....u a ........:l....>a 0 .r.::l:l'l ""u u I I I 'j'l'l I I I I I I I 191 1811 1711 IfJI UII 131 13!1111 I'll 8ll - NAllJRAL 1981 1-lWI II'ER. 1981 '3! 15 III 5 DISTNa 01]) SUSITNA WATER TEMPERATURES,SEPTEMBER NATlRAl .00 1-iWI CflfRA1IOOL IlEGREES (C) r- r- --...-------------, b-- r- e 0 ""'">."<II C ""....:12:.........u .5c.............."0..... ...a ...............>a 0 :l ::l:l'l "..u .r. f Q u t I I I !I r I I I UIJ 1811 1711 lIi1l 1511 131 DISTAIa om 1211 1111 1111 911 Figure 10.River temperature profiles for natural and 2-dam operational conditions. SUSITNA WATER TEMPERATURES.JUNE NAlWL 00 ~AM CPERATItJ/AI., IJEGREES <0 21 I"""NATUW. 1981 2-lJAH(PER.15 1981 -- 10 -5 .0 I- ,' 1 t ---........--I--------0..--.---.------l- e ~0 ......"..e "".....III "C......u ...u ...".......... ~s ...";;;'......~....>a 0 B;l:Q OJ .,'"'I 1 r fCl I,I I I I I 1911 1811 17.11 llllil 150 Ull 138 12Il JIll 'HII 8IiI DlSTAIa AU> SUSITNA WATER TEMPERATURES.JULY NA1UW.NIl ~lFERATIttW. - 1lATUW. 1981 2-lJNI (PER. 1981 15 18 5 B - I---~-_.----------'------ I- "0 ...'">.OJ f-..c ".....'"III "c:.....U ...tJ ...c:..........."'0 .. ...e ..............>Ii 0 ~ f-;:=Q OJ '"'"''"I r I l'Q I I f I J tJ I 1911 Ill!178 168 1511 138 DISTAtI:E am 12Il 1111 IN Figure 10 (Continued).River temperature profiles for natural and 2-dam operational conditions. SUSITNA WATER TEMPERATURES,AUGUST NATWL 00 2-00 lPERATIONAL, DEGREES 10 5 II ~ ~ r- '" - '-- '":l-.----~------- - 5 "".;'"Cl....c ""..........c......\,J'"U ... C '"'"........<'""'"..<...a ......."!-..">a 0 <5~I:I "..<:l r ,I ft:l I 1 I I I I 1911 188 1711 1611 IS6 .1411 131 12D 110 11111 DEGREES 10 OISTAIa eMl) SUSITNA WATER TEMPERATURES,SEPTEMBER NATUW.Am 2-DAlI lPERATIONAL 2S ~HATWL 1981 ,-152-OAM 1FER. 1981 --- III 5 - '-- - - -----------. ~--L ~ ",0 "".;'"OJ..C OJ ....."....."'....u ...u "C III ....... ..<'"""....".........e ...."'"">Ii!0 .c:..1:1 OJ ..<:l \,J I I I 'j'Q I !I !I .I, lB1l 1711 16ll ISll 1411 131l 1211 1111 100 911 D1STAICE OlD -- - - natural flows during any month at a number of mainstem locations.However, the effort to delineate river reaches where postproject flows differ significantly from natural flows has been unsuccessful.The purpose of this effort was to limit the area where flow-related impacts (other than water quality issues)need to be considered.Being unable to establish these limits,it appears necessary to include the entire length of river below the Watana dam site when considering aquatic habitat effects. Simulations were done using the SNTEMP model to examine the effects of the project on the downstream temperature regime of the Susitna River.Two scenarios have been simulated thus far,that of the second year of filling the Watana reservoir,and the normal operation of both a single-and two-dam configuration under 1981 summer meteorologic and hydrologic conditions.The filling scenario was run under cold,normal and warm summer conditions in an effort to determine the extent of possible deviations from natural river temperatures. During June and August of the second year of filling the Watana reservoir,4 C release waters consistently result in.lo!N~:t:~1:ha!l~Il()rm~l. temperatures as far as the Chulitna River confluence.Beyond this point to Sunshine,the limit of current temperature predictive capabilities of SNTEMP, river temperatures remain approximately 1 C cooler than normal,and under cold meteorological conditions may fall below the temperature range normally encountered.The July temperature regime is similar,but may reach the normal river temperature range before the Chulitna confluence.During all three months,tributaries have greater influence on mainstem temperature than under natural conditions due to the smaller mainstem flows during the filling period.This results in a cooling effect on the mainstem during June and July,and in a warming effect during August.During September when the -29- ..... ..... ..... - ..... - mainstem river normally has cooled considerably,temperature deviations are smaller and fall very close to the band of normal temperature conditions. Simulations under 1981 operational conditions show cooler-than-normal river temperatures early in the summer period (June)switching to warmer-than-normal temperatures by September.Thus at some point in late August or early September,operational river temperatures will match those of the natural regime.Both the'single-and two-dam schemes show this same pattern,with the two-dam configuration having the greater deviation from the natural temperature regime • The most serious restriction in this study was the lack of estimates for reservoir release temperatures.We feel that the 1981 DYRESM results cannot be applied when simulating other years.Thus,at this time we are unable to establish a range of downstream temperatures ,resulting from proj ect operations.There is clearly a need for additional DYRESM simulations for representative years. Initial condition river temperature estimates based on regression models have been made with very limited data and thus have wide confidence intervals. Incorporating data collected during the 1983 field season will considerably enhance these models and thus the predictive ability of SNTEMP • -30- ...... ..... REFERENCES Alaska Power Authority.1983.Application for license for major project, Susitna Hydroelectric Project,before the Federal Energy Regulatory Commission.Vol.SA.Exhibit E,Chaps.1 and 2 (figures).Susitna Hydroelectric Project.1 vol. Alaska,University,Arctic Environmental Information and Data Center.1983. Stream flow and temperature modeling in the Susitna Basin,Alaska. Final Report.Alaska Power Au thori ty.Susi tna Hydro Aqua tic Studies, Anchorage,AK.Report for Harza-Ebasco Susitna Joint Venture.60 pp . Chow,V.T.1964.Handbook of applied hydrology.McGraw-Hill Book Co,New York,NY.1 vol. Johnson,N.L.and F.C.Leone.1964.Statistics and experimental design in engineering and the physical sciences.Vol.1.John Wiley and Sons, Inc.,New York,NY 523 pp. Consultants,Inc. Supplement 1.Task Hydroelectric Project. ..... R&M 1982a.Field data collection and processing, 3-Hydrology.Alaska Power Authority.Susitna Prepared for Acres American,Inc.215 pp. 1982b.Field data collection and processing.Vol.3. Task 3-Hydrology.Alaska Power Authority.Susitna Hydroelectric Project.Prepared for Acres American,Inc.215 pp. .....U.S.National Climatic Center.1968 to 1982. Talkeetna,Alaska.US NOAA,Asheville,NC. Local climatological data - 3 pp./month. _. Yevjevich,V.1972.Probability and statistics in hydrology. Resources Publications,Fort Collins,CO.302 pp. -31- Water .- .,... ...., - ...... APPENDIX A:·,: FLOW STATISTICS FOR THE SINGLE-DAM SCENARIO .- Location by River Mile of H20BAL Flow Calculation Nodes NODE RIVER MILE Watana 184.4 Tsusena 181.3 ,~Fog 176.0 Devil 161.3 Chinchee 154.6 D.C.Dam 152.0-Portage 148.8 Indian 138.6 Curry 116.8 Whiskers 101.4 Chulitna 98.2 Talkeetna 97.2 ~Trapper 91.2 Sunshine 83.8 Montana 77.2 Sheep 70.0 Kashwitna 61.2 Little Willow 50.5 Willow 49.8 ,-Deshka 40.6 Susitna Station 25.8 t~ - .-. A-i ".., STATISTICAL RECORD OF 3:.:!-YEAR SUMMARY,WATANA UNLY OCTUB~R MAINSTEN FLOWS (CFS)STANDARD DF.VHHIUN LOCATION PRE-POST _.i.CHANGE f'RE-PO~T- ------------------------------------------------------------------- WATANA 4522.8 6766.1 4<1.6 1100.7 12~6.4 TSUSENA 4774.6 7017.9 47.0 1172.9 1327.5--FOG 499::5.3 7238.6 44.9 1232.1 1367.5I DEVIL 5215.5 7458.9 43.0 1293.5 1411.1 CHINCHEE 5334.3 75T?.7 "\2.1 13:.:!7.5 1135.9 PORTAGE 5569.5 7812.8 40.3 1396.4 1487.6 INDIAN 5770.8 8014.1 J8.9 1456.8 1534.3 CURRY 5931.9 8175.3 37.8 1486.0 1553.3 WHISi<ERS 5985.8 82~~9 •2 37.5 1495.8 1559.8 CHULITNA 11397.0 13640.3 1'1.·7 2385.1 2224.7 TALKEET 14145.4 163B8.7 15.9 2970.8 2772.5 TRAPPER 14189.9 16433.2 15 tf:~2980.1 2·781.2 I"'"SUNSHINE 14286.~16530.2 15.7 3000.5 2BOO.1 MONTANA :14835.3 17078.7 15.1 3088.2 2880.7 SHEEF'152«;8.1 17541.5 14.7 3176.0 :.:!96J.7-KASHWIT 16052.3 18:.:!95.6 14.0 3343.2 3125.5 LWILLOW 16480.8 18724.1 13.6 3450.2 3230.4 WILLOW 17012.1 192::;::;.5 13.2 3593.5 3372.1 DESHKA 18349.0 20592.4 12.2 3«;97.'1 3775.3 SU STA 31426.9 33670.3 7.1 9270.2 9076.5 ADDITIONAL ST~TIS"ICS -COEF.OF VARIAT.SKEWCUl:::EF I CIENTS £XCESSCUl:::fFICIENTS LOCATION PRE-POST-PRE-POST-PRE::-PUS"!"- -------------_._----------------------------------------------------- WATANA .245 .190 .085 .883 -.741 -.470 TSUSENA .246 +189 .070 .898 -.768 -.407 FOG .247 .189 .063 .904 -.laO -.~44 DEVIL .248 .189 .061 .904 -.78:3 -·.2'79 CHINCHEE .249 .189 .061 .903 -.785 -.243 PORTAGE .251 .190 .064 .895 -.782 ••i 17-4 INDIAN .252 .191 .068 .886 ..•777 -.119 ~CURRY .251 .190 .060 .878 -.l8l _.•118 WHISKERS .250 .190 .057 .874 -.790 -.119 CHULITNA .209 .163 -.003 .U37 -.731 -.668 TALKEET .210 .169 -.022 .179 -.762 -.521 TRAPPER .210 .169 -.022 •1 ',8 -.762 -.522 SUNSHINE .210 .169 ..•022 .175 -·.7..32 -.525 MONTANA .208 .169 -.004 .190 -.830 -.';19 SHEEF'.208 .169 .025 .212 -.B32 -.420 KASHWIT .208 .171 .095 .262 -.140 -.294 LWILLOW .209 .173 .143 .298 -.648 -.213 WILLOW .211 .175 .208 .345 -.::;08 -.108 DESHKA .218 .183 .375 .471 -.095 .158 SU STA .295 .2i'O 1.057 1.015 1.697 1.333 A-I - STATISTICPIL RECORD OF 32-YEAR SU!'H'1ARY,WATANA ONLY NOVEMBER MAINSTEl1 FLOWS (CFS)STANrlARD DEVIAT10N LOCATION PRE-POST··i.CHANGE pr~E-POST- ------------------------------------------------------------------- WATANA 2059.0 8667.7 321.0 600.2 1845.7 TSUSENA 2160.9 8769.6 305.8 626.3 1860.1 FOG 2250.2 8858.9 293.7 6:::;0.9 1873.5 DEVIL 2339.3 8948.0 282.5 676.9 1887.6 CHINCHEE 2387.4 89';6.1 276.8 691.-1 1895.5 PORTAGE 2482.6 9091.3 266.2 721.0 1911.7 INDIAN 256-1.0 9172.7 257.7 747.3 1926.2 CURRY 2633.3 9242.0 251.0 762.8 1936.6 WHISKERS 26S6.-1 92b5.1 248.8 ·16l.'-i 19·10.1r-CHULITNA 4854.2 11462.':t 136.1 1201.1 2226.2 TALKEET 607'1.9 126B6.5 108.7 1446.5 2-12</.0 TRAPPER 6097.0 12705.7 108.4 1451.1 2432+"7.....SUNSHINE 6138.6 127'47.3 107.7 1461 •I)2440.7 MONTANA 6374.2 12982.9 103.7 1532.1 2499.2 SHEEP 6573.0 1.3181.7 100.5 1596.9 2552.1 KASHWIT 6896.9 13505.6 95.8 1710.7 2644.7 LWILLOW 7081.0 13689.7 93.3 1779.3 27')0.6 WILLOW 7309.2 13917.9 90.4 1867.6 2772.9 DESHKA 7883.5 14492.1 83.8 2103.1 296~.2.....SU STA 13500.7 20109.4 49.0 4795.2 5403.5 ~ STATISTICAL RECORD OF 32-YEAR BU~lMAR)"WATANA Ul-.tL )'llECEHBI:::R MAINSTEN FLOWS (GFS)BTANDAfUi DEVU4TIUN LOCATION PRE-POl:lT-i.CHANGI:::PRE-POST- r---------------------------------------------------------------~---- WATANA 1414.8 10300.9 628.1 391.3 1930.6 TSUSENA 1494.8 10331.0 :::;94.5 422.6 19,14.4-FOG 156~.0 10451.2 567.8 451.0 19~6.9 DEVIL 163:::;.0 10521.2 :::;43.5 480.1 19/0.0 CHINCHEE 1672.8 10~59.0 531.2 496.0 19·1i~.3 PORTAGE 1747.6 10633.7 508.5 528.0 199'L.1 INri I AN 1811.6 10697.8 490.5 555.8 ;~<')05.1 CURRY 1860.3 10746.5 477.7 564.13 2010.2 WHISKERS 1876.6 10762.7 473.5 567.7 2011.S' CHULITNA 3418.1 12304.3 260.0 733.2 2087.5 TALKEET 4275.5 13161.6 207.8 879.8 2167.1 TRAPPER 4288.9 131/5.1 207.2 882.5 2168.9 SUNSHINE 4318.2 13204.4 205.8 888.6 2172.8 MONTANA 4452.6 13338.8 199.6 923.8 21',14.3 SHEEP 4566.0 13452.1 194.6 957.3 ~~214.4 KASHWIT 4750.8 13636.9 187.0 1018.::,)22:::;0.8-LWILLOW 1056.34855.7 13741.9 183.0 22'73.3 WILLOW 4985.9 13872.1 17E:l.2 1106.1)2303.2 DESHKA 5313.5 14199.6 167.2 1242.0 2386.9 ~SU STA 8:::;17.:::;17403.7 104.3 2891>7 3638.1 -ADDITIONAL STAlISTICS COEF.OF VARIAT.BKEW COEFFICIENTB EXCEBB COEFFICIEHTS....LOCATION PRE-POST-PRE-POST-PRE-POST- -------------------------------------------------------------------- WAf ANA .277 >187 .304 -.614 -.544 -1.345 I""'"TSUSENA .283 .187 .338 -.603 -.3"1J -1.338 FOG .288 >187 >373 -.593 -.259 -1.330 DEVIL .294 .187 .410 -.:383 -.121 -1.318 .....CHINCHEE .297 .187 .430 -.:::;77 -.048 -1.311 PORTAGE .302 .187 .468 -.566 .091 -1.296 INDIAN .307 .187 .:::;00 -.555 .20:;;;:-1.280 CURRY .304 .187 .492 -.5~2 .183 -1.2'17 I"""WHISKERS .303 .187 .489 -.551 .1'77 -1.276 CHULITNA .214 .170 -.042 -.:541 -.51:5 -1.207 TALKEET .206 .165 -.155 -.539 -.435 -1.089 TRAPF'ER .206 .165 -.155 -.S39 -.435 -1.087 SUNSHINE .206 .165 -.155 ..•:::;38 -.435 -1.084 MONTANA .207 .165 -.108 -.::;24 -.436 -1.0J4 PII!IllI SHEEP .210 >165 -.058 ···.508 ·.439 -1.062 KASHWIT .214 .165 .036 -.416 -.439 -1.037 LWILLOW .218 .165 .094 ··.454 -.433 -1.019 WILLOW .222 .166 .165 -.424 -.41'1 -."194 DESHKA .234 .168 .337 ··.337 -.355 -.!l15 SU STA .339 .209 .994,.554 .416 .182 A-3 STATISTICAL RECORD OF 32-YE.AR SU1~jHARY ,WitT tHoUl ONLY JANUARY ....MAINSTEM FLOI..JS (GFS)STANIIAIUl II E::lJI t'l T 10 N LOCATION PRE-POST-k CHAl·{GE PRE-POST- --~---------------------------------_._---------------------------- WATANA 1165.5 9399.2 706.4 312.0 12'78.Y TSUSENA 1231.3 9465.0 QQa.7 334.·1 1291.6 i""'"FOG 1289.0 9522.7 638.8 3~~.6 1303.4 DEVIL 1346.5 9580.2 611.5 377.8 1315.7 CHINCHEE 1377.6 9611.3 597.7 390.1 1322.:; PORTAGE 143~·.0 9672.7 572.2 415.2-1336.5 INDIAN 149 ':.6 9725.3 552.0 43'7.4-13·19.0 CURRY 1532.4 9766.1 537.Z 444.1 lZ53.2 WHISKERS 1546.0 9'779.7 532.6 44.!l.,;,s 1354.6 CHULITNA 2893.9 11127.6 284.5 542.7 1431.0 TALKEET 3579.0 11812.6 230.1 632.1 1487.5 TRAPPER 3590.2 11823.9 229.3 634.1 l-UH:l.8 ~SUNSHINE 3614.8 11848.4 227.8 638.1}1·191.8 MONTANA 3756.0 11989.7 219.2 656.2 1'197'.4 SHEEP 3875.3 12108.9 212.5 672.6 1503.0 KASHWIT 4069.S 12303.2 202.3 701.9 1:.513.6 ~.-.LWILLOW 4179.</12413.6 197.0 719.8 1520.5 WILLOW 4316.8 12S50.5 190.l 743.2 1529.8 DESHKA 4661.2 12894.9 176.6 807.3 1 l':-'';''-r\""""I.~ SU STA 8030.0 16263.7 102.5 1613.0 2056.'J ~ADDITIONAL STATISTICS COEF.OF VARIAT.SKEW l,;OEFFICIEN1S EXl,;ESS COEFFICIENTS r LOCATION PRE';"POST-PRE-PUST-F'HE .•PU~T- -----~-------------------------------------------------------------- WATANA .268 .136 .209 "'1.055 -.766 -.426 TSUSENA .272 .136 .198 -1.036 -.729 -.442 FOG .276 .137 .195 ··1.017 ..•"l0 7 -.455 DEVIL .281 .137 .199 -.997 -.687 -.468 CHINCHEE .283 .138 .204 -.986 -.677 -.474 PORTAGE .289 .138 .220 -.963 -.652 -.485 INDIAN .293 .139 .237 '·.941 -.62"7 -.494 CURRY .290 .139 .237 -.935 -.62'7 -.497....,WHISKERS .289 .139 .237 ··.933 -.627 -.498 CHULITNA .188 .129 .020 -.901 -.705 -.511 TALI<EET .177 .126 .036 --.832 -.'389 -.506 .....TRAPPER .177 .126 .036 -.830 -.389 -.506 SUNSHINE .177 .126 .036 -.827 -.389 -.505 MONTANA .175 .125 .098 ·,.802 -.293 -.501 SHEEF'.174 .124 .157 -.777 -.199 -.495 KASHWIT .172 .123 .261 -·.732 -.OJO -.479 UJILLOW .172 .122 .322 -.'704 .069 -.467 WILLOW .172 .122 .396 -.•~66 .1 'i2 -.449-DESHKA .173 .121 .573 -.559 .4Bl ·-.3B7 SU STA .201 .126 1.177 .554 1.:::S80 .752 A-4 .- STATISTICAL RECORD OF 32-·YEnR SUI"'iNARY,Wt'lTANA ONLY FEBRUARY ....MAINSTEN FLUWS (CFS)STANDARD lll::VltiTLlJN LOCATION PRE-POST-%I,;HANGE PRE-PUST- --------------_._-------------------------------------------------- WATANA 983.3 B6B~.4 783.3 25:3.B 1260.7 TSUSENA 10"\1 •6 B743.7 739.5 273.9 126B.5 FOG 1092.6 8794.8 704.9 292.1 1276.1 DEVIL 1143.6 B845.7 673.5 312.1 1284.4 CHINCHEE 1171.1 8873.3 657.7 323.4 1289.0 PORTAGE 1225.6 8927.7 628.5 347.0 1298.9-INDIAN 1272.2 8974.3 605.4 368.2 1:507.8 CURRY 1306.5 9008.6 539.5 3'13.7 1310.8 WHISKERS 1318.0 9020.1 584.4 37~.5 1:511.8 CHULITNA 2443.5 10145.6 J15.2 440.-1 1373.8 TALKEET 3015.2 10717.3 25:::;.4 519.1 1417.8 TRAPPER 3024.7 10726.8 254.6 520.7 1418.8 SUNSHINE 3045.4 10747.5 252.9 524.3 1420.9 MONTANA 3176.7 108'78.8 242.5 541.3 1421.0 SHEEP 3287.5 10989.6 234.3 5:::;6.9 1421.9 KASHWIT 3468.0 11170.1 222'.1 584.'7 1424.6 LWILLOW 3570.6 11272.7·215.7 601.6 1426.8 WILLOW 3697.8 11399.9 208.3 623.7 1130.3 DESHKA 4017.8 .11720.0 191.7 683.5 1442.6 SU STA 7148.7 14B50.8 107.7 1415.3 1788.6 ADDITIONAL.STATISTICS COfF.OF VARIAT.SKEW COEFFII,;IENTS EXCESS CUEFFICIENTS LOCATION PRE-POST-PRE-PfJST-PRE··PO~3T- --------------_._---------------------------------------------------- WATANA .260 .145 .359 -1.314 -.366 .151 TSUSENA .263 .145 .293 -1.299 -.474 .126 FOG .267 .145 .259 --1.282 -.5BO .104 DEVIL .273 .145 .253 -1.262 -.652 d)80 CHINCHEE .276 .145 .261 '-1.250 -.6~7 .067 PORTAGE .283 .145 .297 -1.22~-.642 .042 INDIAN .289 .146 .343 --1.200 -.561 .022 CURRY .286 .146 .344 -1.195 -.56~.017.-WHISKERS .285 .145 •3'~4 -1.193 -.5~7 .015 CHULITNA .180 .13~.362 -1.141 -.::!i'6 -.020 TAU,EET .172 .132 'l')')·-1.065 -.625 -.088."'04':'-TRAPPER .172 .132 .222 -1.063 -.62~-.089 SUNSHINE .172 .132 .222 --1.059 -.~25 -.091 MONTANA .170 .131 .287 -1.025 -.613 '·.119 SHEEP .169 .129 .342 -.993 -.5.s1 -.140....KASHWIT .169 .128 .432 -.936 -.4:59 -.1"70 LWILLOW .168 .127 .482 -.902 -.343 -.183 WILLOW .169 .125 .541 -.l:J56 -.210 .-•196 DESHKA .170 .123 .673 -.731 1 ~-.-.208•oJ I SU STA .198 .120 1.113 .604 1.951 1.181 A-5 STATISTICAL RECORD OF 32··YEAR SUH~'ARY ,WATANA UNLY MARCH MAINST:::N FLO\~S (CFS)STANDA:';::O lH::VrAl"IUN LOCATION PRE-POST-/.CHANGE.PRE.-POST- --------------------------------------~---~-------------------------- WATANA 898.3 8098.4 801.5 25-;.3 735.3 TSUSENA 946.7 8146.8 760.5 272.7 7·1.5.1 ....FOG 989.2 8189.3 727.9 287.6 7~0.6 DEVIL 1031.6 8231.7 698.0 ~H)3.6 758.8 CHINCHEE 1054.5 8254.5 682.8 312.6 763.5 PORTAGE 1099.7 8299.8 654.7 .j31.2 773.3 I NIl I AN 1138.4 8338.5 632.5 347.8 782.2 CURRY 1169.0 8369.1 ·615.9 ~53.2 78:3.0 WHISKERS 1179.2 8379.3 610.6 354.9 785.9- .-CHULITNA 2184.4 Y384.5 32Y.6 43:':.7 830.8 TALKEET 2679.6 9879.J 268.7 500.9 874.0 TRAPPER 2688.0 Y888.1 267.9 502.5 875.0 SUNSHINE 2706.4 9906.5 266.0 505.9 877.2-MONTANA 254.92824.Y 10025.0 516.9 881.4 SHEEP 2924.8 10124.9 246.2 526.7 885.3 KASHWIT 3087.7 10287.8 233.2 51;:).7 8';012."1 LWILLOW 3180.2 10380.3 226.4 553.9 896.'7 WILLOW 3295.0 104Y5.1 218.5 5~7.0 903.0 [IESHKA 3583.7 10783.8 200.9 602.0 920.1 r-SU STA 6408.0 13608.1 112.4 10:.53.'-jI 1207.8 ADDITIONAL STATISTICS r.OEF.OF VARIAT.SKEW COE.FFICIENlS EXCESS COE.FFICIENTS LOCATioN PRE--··"':;03'r-PRE-·FOST~-...-F'RE-POST- -------------------------------------------------------------------- WATANA .286 .091 .762 '·1.396 1 r.--,1.123•".I";;' .....TSUSENA .288 .091 .738 -1.360 .078 1.090 FOG .291 .092 .719 --1.J24 -.003 1.056 DEVIL .294 .092 .706 -1.284 -.OB6 1,020 CHINCHEE .296 .092 .702 '-1.261 -.127 .998 PORIAGE .301 .093 .699 -1.213 -.19B .955 INDIAN .306 .094 .701 --1.168 -.2Jl:S .918 CURRY .302 .094 .700 -1.152 -.244 .B99 WHISKERS .301 .094 .700 --1 .147 -.244 .893 CHULITNA .198 .089 .489 -.926 -.490 ,,595 TALKEET .187 .088 .574 ..•724 -.112 .458 TRAPPER .187 .088 .574 -.720 -.112 .455 SUNSHINE .187 .089 .574 ·-.711 -.112 .448 MONTANA .183 .088 .613 -.655 -.018 ,406 SHEEP .1BO .087 .647 '.•b06 .068 .375 KASHWIT .176 .087 .703 -.52::!.219 .335 LWILLOW .174 .086 .734 '·.1\72 .308 .:,518 WILLOW .172 .086 .772 -.410 .41Y .302-DESHKA .168 .085 .862 -.249 .6<72 .292 SU STA .161 .089 1.248 1.011 1.860 1.367 A-6 STATISTIC~JL RECOR~I OF ;?;2-YEAR SUMHARY,WtHANA ONLY APRIL HAINSTE~l FLOWS (CFS)STANl)AR~l DEVIAT10N LOCATION F'RE-POST -.%CH~NGE PRE-POSf- --------------_._-------------------------------------------------- WATANA 1099.7 7478.1 580.0 301.0 810.6 TSUSENA 1156.8 7535.3 551.4 318.7 820.9 FOG 1206.8 1585.3 :::J:lB.5 ::.s36.5 8::S1.0 DEVIL 1256.8 7635.3 507.5 356.1 842.1 CHINCHEE 1283.8 7.s62.2 4<16.9 3~7.4 ~48.5 PORTAGE 1337.1 7715.6 477.0 390.8 862.1 INDIAN 1382.8 1761.2 461.3 411.9 ~"l4.5 CURRY 1419.7 7798.1 449.3 419.0 87/.4 WHISKERS 1432.0 7810.5 445.4 421.3 8/8.5 r-CHULITNA 2660.7 9039.1 239./568.0 93:i.3 TALKEET 3238.8 9617.3 196.9 678.1 1001.5 TRAPPER 3249.0 9627.5 196.3 680.5 1002.9 SUNSHINE 3271.2 964<;.7 1 '/5.0 685.2 1005.9 MONTANA 3398.0 9776.4 18l.7 701.4 1020.2 SHEEP 3504.9 9883.4 182.0 715.9 1032.7 KASHWIT 3679.1 10057.6 173.4 741.2 1054.9 ~LWILLOW :.078.1 10156.6 168.8 756.3 1068.0 WILLOW 3900.9 10279.4 163.~775.8 1084.8 DESHKA 4209.8 10588.2 151.5 828.2.1130.0 SU STA 7231.3 13609.8 88.2.1472.8 1707.9 AD[IITIONAl.STATISTICS C:OEF.OF VARIAT.SKE.W COEFFIC1EN1S EXCESS CUEFF I C l EI~TS LOCATION PRE-P08T-PRE-P08T-PRE>P08T- --------------_.----------------------------------------------------- WATANA .274 .108 .669 -1.423 .766 1.275 TSUSENA .275 .109 .704 -1.366 1.052 1.201 FOG .279 .110 .732 '-1.309 1.219 1.132 DEVIL .283 .110 .763 -1.246 1.329 1.061 '....CHINCHEE .286 .111 .781 ··1.210 1.313 1.024 PORTAGE .292 .112 .819 :-1.134 1.444 .9~3 INDIAN .298 .113 .055 ·-1.066 1.49/'.896 CURRY .295 .113 .855 -1.040 1.494 .868-WHISKERS .294 .112 .854 ·-1.032 1.493 .859 CHULITNA .213 .103 .792 -.490 1.45::-.469 TALI-(EET .209 .104 .801 '·.143 .980 .23-4 TRAPPER .209 .104 .801 -.137 .9813 .233 SUNSHINE .209 .104 .801 .-.125 .988 .•231 MONTANA .206 .104 .841 -.oa~1.016 .~45 SHEEP .204 .105 .875 -.051 1.048 .262 KASHWIT .201 .105 .930 .007 l.11·11 .301 LWILLOW .200 .105 .961 .040 1.159 .329 WILLOW .199 .106 .998 .082 1.221 .:569 DESHKA .19'7 .107 1.086 .187 1.398 .491 SU STA .204 1 ~,,,"1.482 .929 2.823 1.958•'\.J A-7 STATISTICAiL RECORD OF ~2··YEAR SUMMflRY,WArANA ONLY MAY MAINSTEM FLOWS (CFS)STANllARD lIEVIATI0N LOCATION PRE-POST··X CHANGE PI<E-POt)T- ------------------------------------------------------------------ WATANA 10354.6 7519.7 ·,27.4 J209.8 2088.0 TSUSENA 10957.3 8122.3 -2~.9 33B~.8 22·42 .~ FOG 11485.2 B650.3 ·-24.7 3555.5 2·10J.2-DEVIL 12012.3 9177.4 -23.6 3737.2 2582.7 CHINCHEE 12296.7 fi461.7 '-23 •1 383<;."7 2686.1 PORTAGE 12859.3 10024.4 -22.0 4050.8 2901.9.....INDIAN 13341.0 10506.1 -~21 .2 4239.1 3096.6 CURRY 13657.1 10822.2 -20.8 4320.8 3173.~ WHISKERS 13762.8 10(127.8 '·20.6 4348.2 319'7.·1 ,.....CHULITNA 23570.9 20736.0 -12.0 7412.1 6441.1 TALKEET 27743.3 24<;08.4 '-10.2 83'72.3 7351.7 TRAPPER 27830.6 24995.7 -10.2 8398.6 731"1.6 SUNSHINE 28020 ..9 25185.9 '·10.1 8456.0 7·134.1 MONTANA 29096.9 26261.9 -9.7 8~21.1 7494.3 SHEEP 30004.7 27169.8 -9.4 8587.3 7558.0 KASHWIT 31484.2 28649.3 -9.0 8716.',1 '76B6.5 LWILLOW 32324.9 2948',1.9 -8.8 .8802.0 777'2.6 WILLOW 33367.3 30532.3 -8.5 8918.8 7892.0 DESHKA 35990.0 33155.1 -7.9 9264.3 8250.1 SU STA 61646.0 58811.1 -4.6 15113.7 14344.() ADDITIONAL STATISTICS COEF.OF VARIAT.SKE.W COEFFICIENTS EXCESS CUEFF1C1ENTS LOCATION PRE-POST-F'RE-POST-F'RE-POST---------------_.----------------------------------------------------- WATANA .310 .278 -.595 .637 .412 - •.513 TSUSENA .309 .276 -.~97 .641 .507 -0171I!"'"FOG .'310 .278 -.~85 .622 .5;:)9 -.114 DEVIL .311 .281 -.564 .594 .53~'·.102 CHINCHEI:::.312 .284 -·.549 .578 r.-')-J -.108•..J,,,)-PORTAGE .315 .289 -.~17 .546 .4B::!..•133 INDIAN .318 .295 ·-.485 .522 .1:':>6 -0162 CURRY .316 .293 -.493 .492 .42~-,.210 WHISKERS .316 .293 ·-.496 .482 .tl19 '")'")C'-......,,;J CHULITNA .314 .311 -.270 .196 0132 ·'.269 TALKEET .302 .295 -.321 .095 .142 -.243 TRAPPER .302 .295 -.321 .094 .142 ..·.242 SUNSHINE .302 .295 -·.321 .092 0142 -.240 MONTANA .293 .285 -.341 .071 0168 .~(252 SHEEP .286 .278 .~•.5 5 2 .059 .188 -.259 KASHWIT .277 .268 -.360 .049 .21/-.264 LWILLOW .272 .264 ·-.359 .048 .~32 -.264 WILLOW .267 .2~8 -.3~3 .052 .249 -.260 DESHKA .257 .249 ··.314 .081 .280 -.239 SU STA .245 .244 .323 .~2~.11',1 -'.078 ..... A-8 STATISTICAL RECORII OF 32-YEAR SUtH1ARY,WAr ANA ONLY JUNE -MAINSTEN FLOWS (CFS)STANDAIUI DEVIArrUN LOCATION PR"E-POST-/.CHANGE PRE-posr- ------------------------------------------------------------------- WATANA 23023.7 6628.4 -71.2 6208.7 3382.8 TSUSENA 23997.9 7602.6 -()8.3 6~68.5 3600.5-FOG 24851.3 8456.1 -66.0 6702.4 3806.6 DEVIL 25703.4 9308.1 -63.8 6941.1 4024.5 CHINCHEE 261b2.9 9767.6 -~2.7 7071.9 4146.3 ""'"'i PORTAGE 27072.4 10677.1 -60.6 7334.3 4395.1 INDIAN 27851.0 11455.8 -58.9 7562.7 4615.3 CURRY 28579.7 12184.5 -57.4 7725.2 4764.4 WHISI<ERS 29823.3 12428.1 -56.9 7779.6 4814.6 F CHULITNA 52400.5 36005.2 -31.3 1196;5.1 91J9.9 TALKEET 63957.6 47562.3 -25>6 15000.0 11987.4 TRAPPER 64158.9 47763.6 -25.6 1504,'.2 12034.0 SUNSHINE 6-4597.4 48202.1 -25>4 15150.1 121::55.4 MONTANA 66517.9 50122.6 -24.6 15366.8 12326.1 SHEEP 68138.3 51743.0 '-24.1 15569.l 1251:.!.3 ~KASHWIT 70779.1 54383.8 -23.2 15936.9 12862.4 LWILLOW 72279.5 558H4.2 -22.7 16164.2 13085.6 WILLOW 74140.0 57744.7 -22.1 16465.2 13385.3 DESHKA 78821.3 ,s2t\26.0 '-20.8 17305.6 14240.7 SU STA 124613.8 108218.5 -13.2 2922/'.0 26666.1 ,.... ADDITIONAL STATISTICS COEF.OF VARIAT.SKEW CUEFFICIENTS EXCESS CUEFFICIENTS I""'"LOCATION PRE-pusT-PRE-PUST-PI~E-POST- -------------------------------------------------------------------- WATANA .270 .510 1.101 2.522 2.489 6.122-.TSUSENA .270 .474 1.054 2.412 2.313 5.660 FOG .270 .450 1.013 2.289 2.160 5.194 DEVIL .270 .432 .972 2.155 2.010 4.716 !""'"CHINCHEE .270 .424 >950 2.081 1.9:i2 4.462 PORTAGE .271 .412 .907 1.935 1.782 3.981 INIIIAN ..272 .403 .871 1.814 1.659 3.597 CURRY .270 .391 .872 1.'193 1.666 3.5"14-WHISi,ERS .270 .387 .873 1.786 1.669 3.527 CHULITNA .228 .255 1.316 1.l71 3.305 4.422 TALKEET .235 .252 .964 1.321 1.it 4 '?!2.655 ~TRAPPER .235 .252 .964 1.320 1.949 2.653 SUNSHINE .235 '")c"...,.964 1.318 1.919 2.648)~..J~ MONTANA .231 .246 .872 1.208 1.626 2.227.-SHEEP .228 .242 .798 1.116 1.365 1.882 KASHWIT .225 .237 .682 .970 .970 1.355 LWILLOW >224 .234 .621 .891 .764 1.082 WILLOW .222 .232 .550 .800 .530 .773~. DESHKA .220 .228 .397 .605 .046 .153 SU STA .235 .246 .143 .283 -.~22 ':'.377 - A-9 STATISTIC~tL RECORD OF 32-·YEAR SUt·HtARY,WATANA ONLY JULY MAINST:::N FLOWS (CFS)STANDAHD l:IEVIATION LOCATION PRE-F'OST-k CHANGE PRE-POST- ------------------------------------------------------------------ WATANA 20810.0 5549.6 -73.3 3484.0 1-1'1'3.1 TSUSENA 21555.B 6295.4 ·,70.8 3659.6 1611.9 ..-FOG ~~2209.2 6948.8 -68.7 381'7.9 1748.5 DEVIL 22861.5 7oS01.1 -66.8 3979.4 U::l95.6 CHINCHEE 23213.3 7952.9 -65.7 4067.8 1978.6 PORTAGE 23909.6 8oS49.2 '·63.8 4215.3 21/l.,..0 INIIIAN 24505.7 9245.3 -62.3 4399.6 ~!300.:3 CURRY 25238.4 9978.0 -60.5 4497.1 2392.5 WHISKERS 25483.4 10222.9 -59.9 4529.7 2423.5 CHULITNA 53167.0 37906.5 '-28.7 7oS/l4."l 5808.8 TALKEET 64309.8 49049.3 -23.7 9266.1 7320.4 TRAPPER tl<\512.1 49251.7 ·,23.7 9295.2 7349.1 .....SUNSHINE t>4953.0 49692.6 -23.5 9358.7 7411.7 MONTANA 67180.1 51919.7 ·,,22.7 9458.2 7197.8 SHEEP t)9059.2 53798.8 -22.1 95~O.8 7581.8 KASHWIT 72121.5 56861.0 ·,21.2 9718.4 773"..9.....LWILLOW 73861.4 58600.9 -20.7 9822.4 7B40.9 WILLOW 76018.9 60758.4 -20.1 99511.8 7976.9 DESHKA 81447.4 66187.0 -18.7 10344.9 8367.7 ~SU STA 1~r4549.6 119289.1 -11.3 16035.1 14357.tl ""'"ADDITIONAL STATISTICS COEF.OF VARIAT.SKEW CUEFF Ie 1 EN'rs EXCESS COEFFICIENTS LOCATION f'RE-POST-PRE-POST-PRE-F'UST- -------------------------------------------------------------------- WATANA .167 .265 .587 1.693 -.042 1.857 ~TSUSENA .170 .256 .610 1.653 .012 1.9~1 FOG .172 .252 .627 1.586 .052 1.917 DEVIL .174 .249 .641 1.508 .088 1.81"7 CHINCHEE .175 .249 .647 1.465 .104 1.748 PORTAGE .178 .248 .657 1.382 .133 1.596 INDIAN .180 .249 .•664 1.315 .153 1.463 CURRY .178 .240 .655 1.'27l...138 1.349 ~WHISKERS .178 .237 .652 1.263 .133 1.312 CHULITNA .144 .1~3 .4~8 .721 -.455 ~,.144 TALKEET .144 .149 .354 .501 -.370 -.273 TRAPPER .144 .149 .354 .501 -.370 -.274 SUNSHINE::.144 .149 .354 .499 -.370 -.276 MONTANA .141 .144 .368 .532 -.322 ·'.159 SHEEP .138 .141 .381 .562 -.27/l -.048P"'".135 .136KASHWIT .404 .610 -.184 1 ..,.,"') f ..J • LWILLOW •133 ,134 .417 .638 -.127 .27·1 WILLOW .131 .131 .434 .673 -.051 .430 DESHKA .127 .126 .478 .7::54 .lG8 .830 SU STA .119 .120 .731 .991 1.666 2.478 A-IO ~ STATISTICAL RECOfHl OF 32-YEAR~UMMARY,WATANA UNLY AUGUST ,...,MAINSTE1'1 FLOWS (CFS)STANDARD DEVIATION LOCATION PRE-POST-~CHANGE PRE-POST- ---------------------------------------------_.~------------------- WATANA 1.8628.1 9778.8 -4"7.5 4102.8 2~6::!.8 TSUSENA 19350.4 10501.1 '-45.7 1284.1 2638.9 I"'"'FOG 1.9983.2 11133.9 -44.3 4451.6 2728.0 DEVIL 20611.9-11765.6 -42.9 4626.1 28::55.8 CHINCHEE 20955.6 12106.4 -42 ..2 4722.8 2901.0 PORTAGE 2162<;.9 12i'BO.7 .-il 0 .9 4919.3 304,3.1.-INDIAN 22207.3 13358.0 -3'!.B 5092.4 3177.1 CURRY 22853.1 14003.8 -38.7 ~214.6 3276.7 WHISKERS 23069.0 14219.7 -38.4 5255.6 3310.6 CHULITNA 46115.6 37266.4 '-19.2 9078.1 7353.7 TALKEET 56684.8 47835.6 -15.6 11761.1 9691.7 TRAPPER ~;4B63.2 48013.9 -15.6 11798.1 9727.9 SUNSHINE 57251.8 48402.6 -15.5 11878.8 9806.6 MONTANA ~;<;005.7 50210.4 -15.0 11921.9 9826.9 SHEEP 60596.2 51746.9 -14.6 11966.8 9854.4 KASHWIT 63090.2 542'11.0 '-14 +()12055.l7'9Y1Y.0 LWILLOW 64507.3 55658.1 -13.7 12115.4 9966.6 WILLOW 66264.5 5741:,).3 -13.1 12197.8 10036.3 DESHKA 70685.8 61836.6 -1::?5 12446.3 10262.4 SU STA 11.3935.4 105086.2 -7.8 17221.9 1:5231.8 .....ADDITIONAL STATISTICS COEF.OF VARIAT.SKEW COEFFICIENTS EXCESS COk::FFICIENTS ~"""LOCATION """PRE-POST~PRE-POST-PRE-POST- -------------------------------------------------------------------- WATANA .220 .262 1.414 2.380 ~l.421 6.542 TSUSENA .221 .251 1.428 2.646 2.426 7.673 FOG .223 .245 1.439 2.810 2.412 8.395 DEVIL .224 .241 1.447 2.913 2.387 8.842 CHINCHk::E .225 .240 1.450 2.946 2.369 8.976 PORTAGE .227 .238 1.455 2.972 2.329 9.047 INDIAN .229 .238 1+458 2.961 2.2C10 8.943 CURRY .228 .234 1.44~2.944 2.269 8d~44-WHISKERS .22ij .233 1.446 2.937 2.262 8.805 CHULITNA .197 .197 1.112 1.731 2.296 4.318 TALI<EET .207 .203 .801 1.145 1.210 2.434 TRAPPER .207 .203 .801 1.143 1.::?10 2.430 SUNSHINE .207 .203 .801 1.140 1.210 2.420 MONTANA .202 .196 .820 1.173 1.::?16 2.465 SHEEP .197 .190 .834 1.196 1.216 2.493 KASHWIT .191 .183 .849 .1.222 1.209 2.~14 LWIl.LOW .188 .179 .854 1.232 1.201 2.513 WILLOW .184 .17~.858 1.::?38 1.188 2.501 DESHKA .176 .166 .B51 1.227 1.139 2.416 SU STA .151 .145 .317 .434 .447 .746 A-ll ~STATISTICAL RECORD OF 32-YEAR SUHMARY,WATAIM ONLY SEP"r El'iB MAINSTEN FLOWS (GFS)STANDARD DEVIATION LOCATION PRE-POST-/.CHANGE PRE-PUST- ---------------------------------------_.~------------------------- WA1ANA 10791.9 7310.8 -32.3 3044.8 1165.8 TSUSENA 11306.2 782~.1 -30.a 3211.7 1091.9 FOG 11756.7 8275.6 -29.6 3365.5 1069.5 """DEVIL 12206.5 8725.4 -28.5 3525.4 108'1.2 CHINCHEE 1214'1.1 8968.0 -28.0 3613.9 1116.7 PORTAGE 12929.2 9448.1 -26.'1 3793.2 1202.1 INDIAN 13340.2 9859.1 ··26.1 3'150.6 1302.7 CURRY 13702.4 10221.3 -25.4 4043.0 1374.2 WHISKERS 13823.4 10342.3 ·-25.2 1074.0 1398.9 CHULITNA 25768.0 22286.9 -13.5 7098.0 480'1.1 TALKEET 31·186.3 28305.2 -11.0 8835.8 6416.9 TRAPPER 31886.3 28405.2 -10.9 8863.6 6443.4 SUNSHINE 32104.2 28623.1 .~10.a 8924.2 6501.:; MONTANA 33241.7 29760.6 -10.5 9021.0 6608.4 SHEEP 34201.5 30720.4 ··10.2 9114.(;1 6713.1 KASHWIT 35765.6 32284.5 -9.7 9290.7 6'119.0 LWLLLOW 36654.3 33173.2 -9.5 9402.9 7030.5 WILLOW 37756.3 34:275.1 -9.2 9553.6 "/221:30 0 DESHKA 40529.0 37047.8 -8.6 9'186.2 7738.7 SU STA 67651.7 64170.6 -5.1 16667.4 1516J.u ADDITIONAL STATLSTICS COEF.OF VARIAT.SKEW COI::":FFICIENTS E.XCESS CUEFF 1 cn:J.ITs LOCATION PRE-POST-PRE-POST-PRt:-POST- -------------------------------------------------------------------- WATANA .282 .159 .257 .131 -.382 .948 TSUSENA .284 .140 .260 .587 -.401 1.5u4 FOG .286 .129 .267 1.058 -.420 1.<7'87 DEVIL .289 .125 .276 1.466 -.438 2.368 CHINCHE::E .290 .125 .282 1.623 -.4-18 2.499 PORTAGE .293 .127 .295 1.782 -.467 2.583 IN[IIAN .296 .132 .307 1.790 -.482 2.498 CURRY .295 .134 .30/1.800 -.489 2.627 WHISKERS .295 .135 .307 1.799 -.4'11 2.657 CHULITNA .275 .216 .654 1.856 .5?7 4."702 TALKEET .278 .227 .613 1.403 .3~7 2.'i66 TRAPPER .278 .227 .613 1.39'1 .3~7 2.9:53 JIM-!SUNSHINE .278 .227 .613 1.;)91 .3:31 2.927 MONTANA .271 ")...~..,.598 1.366 3 7 "'"2.878.~~..:..•_:.oJ SHEEP .267 .219 .~82 1.334 .383 2.B04 ,~KASHWIT .260 .214 .551 1.266 • 3 t:31 2.626 LWILLOW .257 .213 .532 1.221 .3'72 2.~O2 WILLOW .253 .211 .501'1.160 .354 2.333 \~DESHI<A .246 .209 .441 t.002 .21'8 1.B6S' SU STA .246 .236 .119 .291 -.~28 -.:21 1 A-12 - APPENDIX B FLOW STATISTICS FOR THE LOG-TRANSFORMED DATA, SINGLE-DAM SCENARIO STATISTICAL RECURD OF 32··YEAR SUMMARY,WATAHA UNLY JUNE MAINSTEM FLOWS (lM CFS)STANDARD DEVI~TION .- I - lOCATION WATANA TSUSENA FOG DEVIL CHINCHEE PORTAGE INDIAN CURRY WHISKERS CHULITNA TALKEET -TRAPPER SUNSHINE MONTANA SHEEP KASH~JIT lWILLOW WILLOW DESHKA SU STA PRE- 10.011 10.053 10.0l:.t7 10.121 10.138 -10.172 10.200 10.226 10.235 10.8&14 11.041 11.044 11.051 11.081 11.1 05 11+14..3 11.165 11.190 11.2::;2 11.705 POST .. 8.718 8.863 8.974 9.073 9.122 9.213 9.284 9.349 9.369 10.465 10.742 10.746 10.756 10.796 10.828 10.878 10.906 10.939 11.017 11.::;62 PRE- .259 .260 .261 .262 .263 .264 .214 .227. ')"ol)"".J.':'"I •22·7 ~2:!5 .223 ";'']1-->....:...:. .221 .221 .221 .243 PUBT- .368 .353 .347 .343 .343 .~42 .343 •33-~ .332 .227 .234 .234 .234 .231 .229 .226 .225 'J~'C:-+...~.J .224 .253 ADDITIONAL STATISTICS COEF.OF VARIAT.SKEW CUEFFICIENTS EXCESS CUEFF1CIE1HS """'LOCAT!ON PRE-F'OST-PRE-POST-PRE-POST- --------------------------------------------------------------------- WATANA .026 .042 .174 1.881 .557 2.989 TSUSENA .026 .040 .151 1.73";.4'79 2.606 FOG .026 .039 .128 1 r:.::").111 2.169.;.J~.:. DEVIL .026 .038 0105 1.354 .344 1.742 CHINCHEE .026 .038 .093 1.248 .:S10 1.530 PORTAGE .026 .037 .068 1.052 .243 1.163 INDIAN .026 .037 .046 .899 .190 .902 CURRY .026 .036 .050 .893 0195 .901 WHISKERS .02.J .035 .052 .891 .196 .8'1'9 CHULITNA .020 .022 .466 .921 1.05u 1.654 TALKEET .021 .022 .199 .527 .488 .827 .....TRAPPER .021 .022 .199 .526 .488 .B25 SUNSHINE .021 )022 .117'9 .524 .188 .::i22 MONTANA .020 .021 .155 .467 .344 .628 SHEEP .020 .021 .119 .418 ~22"7 .464 KASHWIT .020 .021 .063 .3;;)9 .051 .212 LWIlLOW .020 .021 .034 .297 -.0'10 .083 WILLOW .020 .021 -.001 .246 -.1~12 --.061 DESHKA .020 .020 .-.077 .134 -.312 -.335 SU STA .021 .022 -.340 -.260 -.12'7 ··.(}33 B-1 ~... STATISTICAL RECORD OF 32~YEAR SUMMARY,WATANA ONt_Y JULY HAINSTEM FLOWS (LN CFS)SlANDARD DEVIATIUN - LOCATION WATANA TSUSENA FOG DEVIL CHINCHEE PORTAGE INDIAN CURRY WHISKERS CHULITNA TALKEET TRAPPER SUNSHINE MONTANA SHEEP KASHWIT LWILLOW WILLOW DESHKA SU STA PRE- 9.930 9.96~ 9.994 10.023 10.038 10.067 10.092 10.121 10.131 10.871 11.062 11.065 11.071 11.1 06 11.1:14 11.177 11.202 11.231 11.300 11.803 POST- 8.::)94 8.721 8 d~21 8.910 8.956 9.039 9.105 9.183 9.208 10.532 10.790 10.794 10.803 10.848 10.884 10.940 10.970 11.00'1 11.093 11.683 PRE- .164 .166 .168 .1'10 •171 .173 .175 .1 J J} .173 .142 .143 .143 .143 .140 .137 .134 .lJ2 .130 .1 :25 .117 POUT- .228 .223 .221 ~,,,.,.,.".. .223 .225 .227 .220 .218 .148 .147 .147 .147 .142 .13l3 .133 .131 .128 .123 .116 ~ADDITIONAl.STATISTICS COEF.UF VARIAT.SKEW CO~FFICIENTS E>~CESS COEFFICll::.NTS LOCATIUN PRE-POST-PRE-P08T-PRE -.PUUT- -------------------------------------------------------------------- WATANA .017 .027 .269 1.479 -.~69 1.059 TSUSENA .017 .026 .282 1.372 -.337 .'185-FOG .017 .025 .290 1.247 -.Jl0 8C"-'•...J~ DEVIL .017 .025 .29~1.121 -.28~,708 CHINCHEE .017 .025 .297 1.056 -.272 ,...., .0':'.. PORTAGE .017 .025 .298 •939 -.250 .4'15 INDIAN .017 .025 .298 .850 -.232 .392 CURRY .017 .024 .292 .828 -.236 .349 WHISKERS .017 .024 .290 .821 -.2:.57 .334 CHULITNA .013 .014 .21:3 .477 -.488 ..•374 TALKEET .013 .014 .072 ~220 -.328 -.;;)15 TRAPPER .013 .014 .072 .21'1 -.328 -.315 r-SUNSHINE .013 .014 .072 .218 -.328 '-.316 l MONTANA .013 .013 .090 ~)-c-"}-.327 -.278.,,J4 SHEEP .012 ,013 .105 .279 -.320 -.237 KASHWIT .012 .012 .127 .321 -.296 1 ,--'"-.,).:;. LWILLOW .012 .012 .139 .344 -.277 -.096 WILLOW .012 .012 .1::i4 .370 -.246 -.019 DESHKA .011 .011 .186 .427 -.1-'6 .200~SU STA .010 .010 .280 .485 .'199 1.520 f<II!liII5l B-2 STATISTICAL RECORD OF 32"'YEAR SUMMAf.:Y,WATANA ONLY AUGUST MAINSTEM FLOWS <LN CFS)STAtHIARlI rlEVIATI0N ..".. - LOCATION WATANA TSUSENA FOG DEVIL CHHICHEE PORTAGE IN[lIAN CURRY WHISKERS CHULITNA TALKEET TRAPPER SUNSHINE MONTANA SHEEP KASHWIT LWILLOW WILLOW [IESHKA SU STA PRE- 9.812 9.849 9.S81 9.912 '/)929 9.960 9.986 10.01~ 10.024 10.721 10.'/25 10.928 10.935 10.'7'67 10.994 11.035 Uot058 11.086 11.152 11.632 P03T- 9.162 9.236 9.296 9.352 '1.381 9.436 '1.480 9.528 '1.543 10.509 10.757 10.761 10.769 10.80'7 10.838 10.886 10.913 10.944 11.020 11.~52 PRE- l202 .203 .204 .20~ .205 .207 .208 .208 ,:l07 .188 .203 .203 .203 .1"1"7 .192 .186 .1:::J2 .178 .170 .152 POS::T- .219 .205 .197 .192 .1"10 .189 .138 .186 .185 .180 .194 .17'4 .194 .186 .181 .1J3 .169 .165 .157 .144 ADDITIONAL STATISTICS -LOCATION COEF.UF VARIAT. PRE-POST- SKEW COEFFICIENTS PRE-PUST- EXCESS COEFFICIENTS P:'E··PUST- ...... ...... WATANA TSUSENA FOG DEVIL CHINCHEE:: PORTAGE INDIAN CURRY WHISKERS CHULITNA TALKEET TRAPPER SUNSHINE MONTANA SHEEP KASHWIT LWILLOW WILLOW DESHKA SU STA .021 .021 .021 .021 .021 .021 .021 .021 .021 .018 .019 .019 .019 .018 .017 .017 .016 .Ol"s .015 .013 .024 .022 .021 .021 .020 .020 .020 .020 .019 .017 .018 .018 .018 .017 .017 .016 .016 .015 .014 .012 .824 .845 .863 .879 .887 .902 .912 .90~ .902 .313 .029 .029 .029 .094 .143 .210 .241 .274 .328 ..•103 B-3 1.581 1.989 2.251 2.423 2.481 2.~39 2.:538 2.~23 2.516 .875 .259 .258 .256 .344 .410 .501 .544 .587 .652 .005 .'i'i'8 ."189 .990 .982 .'i76 .959 .942 .932 .928 1.621 1.318 1.318 1.318 1.197 1.099 .919 .869 •7~'4 .563 .1 it:l 3.636 ,1 .120 5.321 6.080 6.272 6.438 6.392 6.~28 6.298 2.793 1.987 1.'i'85 1.'780 1.'101 1.831 1.712 :i .6·11 1.349 1.309 .212 STATISTICAL RECORD OF 32-YEAR SUMMARY,WATANA ONLY S E r'T E.~1 B MAINSTEH FLOWS (LN CFS)STANDARD DEVIATIUN - /..... LOCATION WATANA TSUSENA FOG DEVIL CHINCHEE PORTAGE HUH AN CURRY WHISi\ERS CHULITNA TALKEET TRAPPER SUNSHINE MONTANA SHEEP I\ASHWI T LWILLOW WILLOW DESHKA BU STA F'RE- 9.246 9.292 9.331 9.36~ 9.387 9.424 'i.455 9.482 9.491 10.121 10.330 10.333 10.340 10.376 10.406 10.452 10.478 10.~08 10.580 11.091 POST- 8.884 8.956 '1.013 9.067 '1.095 9.147 '7.189 9.224 9.236 9.992 10.229 10.232 10.240 10.279 10.312 10.362 10.389 10.422 10.500 11.042 PRE- -.292 .294 .296 .299 .~OO .303 .J05 .304 .::)04 .274 .276 .276 .276 .270 '),.....00 .260 ,257 .254 .249 PUST- .164 .138 .124 .117 .115 .117 .121 .123 .123 .193 .210 .210 .:HO .206 .204 .201 .200 .200 .200 .241 -ADDITIONAL STATISTICS COEF.OF VARIA1.SKEW CUI:::FFICIENTS EXCESS CUI:::FF I CI EI~TS .....LOCATION PRE-PUST-PRE-PUST-PI;::::..f'U~T- --------------------------------------------------------------------- WATANA .032 .018 -1271 -.434 -.467 .734 TSUSENA .032 .015 -.266 .066 -.481 .7YO FOG .032 .014 ·,.258 ',...C'"-.'1'7~1.038.0..::.... DEVIL .032 .013 -.247 1.154 -.511 1.463 CHINCHI:::E .032 .013 ".240 1.370 -.520 1.696 PORTAGE .032 .013 -.226 1.59~-.538 L991 INDIAN .032 .013 '-,213 1.607 -.553 2.001 CURRY .032 .013 -.207 1.~98 -.365 2.078 ~WHISKERS 0-(').013 -)205 1.590 -.568 2.091+"J~ CHULITNA .027 .019 -.011 1.052 -.1'7~2.367 TALi\EET .027 .021 .004 .636 -.Jb4 1.177 TRAPPER .027 .021 .004 .633 -.364 1.168....SUNSHINE .027 .021 .004 .626 ··.:loS 4 1.149 MONTANA .026 .020 -.012 .613 -.:532 1.124 SHEEP .026 ,1)20 ..•Q27 .591 -.:510 1.078.....hASHWIT .025 .019 -.054 .540 -.284 .965 LWILLOW o')r.-,019 '-.070 .505 '-.274 .886•~....J WILLOW .024 .01<1 -.090 .459 -.267 •l'/9-DESHKA .024 .019 ·-.138 .341 -.273 .302· su STti .023 Q"'")-.305 -.200 -.~72 -.325..::..... B-4 ,- ..... - APPENDIX C MONTHLY FLOW PROFILES FOR NATURAL AND SINGLE-DAM OPERATIONAL CONDITIONS FLOW PROFILES --1 DAM SCENARIO lICTlHR FLDV (CfS) 4M0 PREPROJECT 360llEI / I"""32llllII1 P!lSTPllIlJECT 2llIlIIJ ---2_1 2IB1I1 1"""' 1_ I2IBI1-,- 4g II ;:m 1118 168 1411 1211 lill !II 211 DISTMa am FLOW PROFILES --1 DAM SCENARIO NMIIlEIl F1.DV(CfS) 4_ ~ PREPROJECT HI r-32ID, P$TPRDJECT 2IlIlII re-.--241m :~2IlIlII1_ -I2IBI lUll r- 4i1lil11 ,~II f- "- r- io- r- / "-/-,.---r - ..----J~---'"~a '".. "..'"Q ..".../B "-"t.l ==..... '"...........".. ~I J 0 1 I tJ I I 1 .;;t.:l ;:m .188 lfil 1411 1211 1111 DISTMa all) C-l .411 211 " "... FLOW PROFILES --1 DAM SCENARIO II.CEIIO FlOV CI1Sl 2IlIBI --PREPRlllECT 18IIlll / 16IIlll / PlSPIlOJECT ../1411111 -.-J ---IplIlIIR121111 ----~-1_ lIB filiI ~.. •1 ..... r- 2l1li1 II 2IIl III 161 1411 1211 III II IiII 4Il 211 8 DlSTANI (III} FLOW PROFILES --I DAM SCENARIO J~RY FLOW (CFS> 2IlIlOO PREPROJECT IBIUl 160Iilll / POSTPROJECT II_ I ~---~ 12IlI!ll -/ IllOOll -------oJ- BIlI!Il 6mlll ~... 400ll .... ""a l>l ... ~'" 2llllll 1'<1 II 2IJI!100 168 1411 1211 JOO all fill 2ll S DISTMU (Ill) C-2 FLOW PROFILES --I DAM SCENARIO FEmlJARY FLIlV (115) 2lliBl PREPRllJEl:T IBD -161Bl PllSTPRllJECT 14118 / --/12111 ,.-- IIiBIII r--J----I -- lHIII r-6il1II .... 4111iJ ....co 2111 .-H 2IlH IIIl 1611 14m 121 11J1 III 21 DISTAtlE am jOililIIIIII FLOW PROFILES --I DAM SCENARIO ~AROf FLOW (O'SJ 2l!il1!ll PREPROJECT IBlll!ll 161l1!l1 POSTPROJECT 14. r .--/ 12Illm /---lllOOIl rI ------J IllBl - rAMI 6lII!Il ".. 41l1!11 .... p-eA ..; 2IlI!Il H 2BH llIl 1611 14ll 121 IIIl III 611 4H 21 r-DISTAtlE OIll C-3 Fl.OV[FS) FLOW PROFILES APRIL 1 DAM SCENARIO I- '- I- '-/ / I--.r--!- ----.....J--- '- -Qj...-....." r0-Il .>t .......'"'"'"'"'"'"/~".. l-to U ...Ec::......to ........"--:c :J :J01°:ij ,,~I r 1 r "'I FLOW PROFILES --I DAM SCENARIO Jlf£ R.OV (CFSl I~ PREPROJECT 135lBJ lalIDl POSIPROJECT IBSIlIlB ......--!JIJIBl ~ 7WI I f; IiIIW -r--45lB1 al... mJIJ .... " ISIB1 8 alB IllliI 1611 1411 J211 liII llliI 611 411 211 8 ....DISTANI om I FLOW PROFILES --I DAM SCENARIO ~ JlLY R.OV (CfS) I_I PREPROJECT 13SIlIlI1 12IIIlIlI! POSTPROJECT II\SlBI !"""---!lIlI1I1I1 1SIlIlIl 6tBIl 45iDI 3IlIlIIl ISllIlII ~II 2IlI HI 1611 1411 1211 IiII llliI Iiil 211 DISTANI OIll C-5 .- .... "... APPENDIX D FLOW STATISTICS FOR THE TWO-DAM SCENARIO STATISTICAL RECORO OF 32-YEAR SUMMARY,2 DAM SCENARIU OCTOBER MAINSTEM FLOWS (CFS)STANDARD DEVIATION ,-. I r i LOCATION I1.C.IIAM PORTAGE INIIIAN CURRY WHISKERS CHULITNA TALKEET TRAPPER SUNSHINE MONTANA SHEEP KASHWIT LWILLOW WILLOW DESHKA SU STA PRE- 5334.3 5~69.5 5770.8 5931.9 5985.8 11397.0 14145.4 14189.9 14286.8 14835.3 15298.1 16052.3 16480.8 17012.1 18349.0 31426.'1 POST- 7318.5 7553.6 7754.9 1916.1 7970.0 133Hl.1 16129.5 16174.0 16271.0 16SH 9.5 17282.3 180:S6.4 18464.9 18'/96.3 20333.2 33411.1 k CHANGE 37.2 3:5.6 34.4 33.4 33.1 17.4 14.0 14.0 13.9 13.4 13.0 12.4 12.0 1.1.7 10.8 6.3 PRE- 1327.5 1;:)116.-1 1456.8 1486.0 14115.8 2385.1 29"70.8 2980.1 3000.5 3088.2 3176.0 334;:).2 3450.2 35'73.:5 3997."1 V270.2 POS1- 106}.7 11 O~.7 1142.3 11:::iCl.2 1163.7 1928.5 2471.5 2480.0 2498.5 2~72.7 2652.4 2812.2 2917.5 3060.8 34'/1.6 8845.4 F ADIIITIONAIL STATISTICS COEF.OF VARIAT.SKEW COEFFICIEN'rS EXCESS CUEFFICIENTS LOCATION PRE-POST-PRE-POST-Pl-<E-f'OST- --------------,------------------------------------------------------ .-D.C.DAM .219 .146 .061 1.334 -.78:5 8'jr>,•.:.0 PORTAGE .251 .146 .064 1.343 -.782 .995 INDIAN .2~2 .147 .068 1.335 -.777 1.113 ,....,CURRY .251 .146 .060 1.328 -.78,}1.110 WHISKERS .250 .146 .057 1.325 -.790 1.108 CHULITNA .209 .144 -.003 .576 -.731 +2~4 TALKEET .210 .153 ··.022 .443 -.762 -.016 ~TRAPPER .210 .153 -.022 .441 -.i'62 -.019 SUNSHINE .210 .154 '-.022 .435 -.762 -.026 MONTANA .208 .153.-.004 .432 -.830 -.068 r SHEEP .208 .153 .025 .440 -.832 -.066 I,KASHWIT .208 .156 .095 .474 -.'/40 .003 LWILLOW .209 .158 .143 .501 -.648 .071 r WILLOW .211 .161 .208 .542 -.508 •1~]4 DESHKA .218 .171 .375 .654 -.011:3 .q67 SU STA .295 .265 1.05i'1.09i'1.69i'1.6.38 D-l STATISTICAL RECORD OF 32-YEAR SUMMARY,2 DAM SCENARIU NOVEl-lBER MAINSTEM FLOW~(CFS)STANDARD DEVIATIUN ~- LOCATION II.C.DAM PORTAGE INDIAN CURRY WHISKERS CHULITNA TALKEET TRAPPER SUNSHINE MONTANA SHEEP KASHWIT LWILLOW WILLOW DESHKA SU STA PRE- 2387.4 2482.6 2564.0 263.3.3 2656.4 4854.2 6077.9 60'/7.0 6138.6 6374.2 6573.0 6896.9 7081.0 7309.2 7883.5 13500.7 POST- 9444.6 n:i39.8 9621.2 "'690.5 9713.6 11'111.4 13135.1 13154.2 13195.9 13'131.4 13630.2 13954.1 14138.2 14366.4 14940.7 20557.9 7.CHANGE 295.6 284.3 268.0 265."1 14:.5.4 116.1 115.7 115.0 110.7 107.4 102.3 99.7 96.6 89.5 PRE- 691.4 721.0 747.3 762.8 767."1 1201.1 1446.5 1451.1 1461.0 1:332.1 1596.9 1710.7 1779.3 1867.6 2103.1 ,1795.2 POST- 1"'09.4 1"'1'7.2 1928.3 1936.2 1938.8 2170.4 2362.8 2366.1 :.?373.1 2110.1 2445.7 2:.511.8 2553.5 2609.2 2167.1 5037.8 ADDITIONAL STATISTICS LOCATION COEF.OF VARIAT. PRE-POST- SKEW CUEFFICIENTS PRE-POST- EXCESS COEFFICIENTS F'RE-POST- ---------------------~---------------------------------------------- .- r I r D.C.DAli PORTAGE INDIAN CURRY WHISKERS CHULITNA TALKEET TRAPPER SUNSHINE MONTANA SHEEP KASHWIT LWILLOW WILLOW DESHKA SU STA .290 .290 .291 .290 .289 .247 .238 .238 .238 .240 .243 .248 .251 .256 .26'7 .355 .202 .201 .200 .200 .200 .182 .180 .180 .180 .179 .179 .180 .181 .182 .185 .245 .253 .223 .204 .203 .202 .271 .230 .230 .230 .343 .444 .612 .705 .815 1.059 1.852 D-2 - •.308 -.309 ···.310 -.314 '·.315 -.345 ·-.364 -.364 -.363 -.358 '·.348 -.318 '·.295 -.260 -.148 1.012 -.102 -.152 -.180 -.179 -.1711' -.220 -.284 -.284 ··.284 .048 .3,s1 .900 1.209 1.583 2.441 5.5:J0 -1.581 -1.571 -1.35? -1.5:J2 -1.:549 -1.258 -1.148 -1.146 -1.142 -1.103 -1.069 -1.005 -.963 -.903 -.711 2.286 STATISTICAL RECORD Of 32··YEt'lR SU~HIARY,2 DMl SCENARIO i:lECEt1BER MAINSTEM FLOWS (CFS)STANDARD DEVIATION LOCATION D.C.DAM PORTAGE INDIAN CURRY WHISKERS CHULITNA TALKEET TRAPPER SUNSHINE MONTANA SHEEP KASHWIT LWILLOW WILLOW DESHKA SU STA PRE- 1672.8 1747.6 1811.6 1860.3 1876.6 3418.1 4275.5 4288.9 4318.2 4452.6 4566.0 4750.8 4855.7 4985.9 5313.5 8517.5 POST- 11128.3 11203.0 11267.1 11315.8 11332.1 12B7.3.6 13730.9 1374·1.4 13773.7 13908.1 14021.5 14206.2 14311.2 14441.4 14768.9 17973.0 7.CHANGE 565.2 541.1 521.9 508.3 503.9 276.6 221.2 220.5 219.0 212.4 207.1 199.0 194.l lB9.6 178.0 111.0 f'RE- 496.0 528.0 5~S.8 564.8 567.7 733.2 879.8 882.5 888.6 923.8 957.3 1018.5 1056.3 1106.0 1242.0 2891.7 F'OST- 2073.4 2081.1 2088.2 2092.6 2094.1 2202.0 2288.2 ~281i .7 2293.2 2306.3 2319.4 23~4.3 ~~360.4 2382.4 2446.8 3567.5 -ADDITIONAL STATISTICS ....COEF.OF VARIAT.SKEW COEFFIC1EWTS EXCESS CUEFFICJ:EHTS LOCATION PRE-PUST-Pti:E-POST-Pti:E-F'(JST- ----------------------------------~--------------------------------- D.C.DAti .297 .186 .430 -.836 -.048 -1.113 PORTAGE .302 .186 .468 -.834 .091 -1 .109 INDIAN .307 .lB5 .500 -.831 .202 ~·1.104 CURRY .301 .185 .492 '·.831 .183 -1.102 r-'WHISKERS .303 .185 .489 -.830 .177 -1.101 CHULITNA .214 .171 -.042 -.820 -.515 -1.017 TALKEET .206 .167 -.155 -.816 -.435 -.928-TRAPPER .206 .167 ·'.155 -.816 -.435 -.927 SUNSHINE .206 .166 -.155 -.816 -.435 -.924 MONTANA .207 .166 ..•108 -.812 -.436 -.'il1 SHEEP .210 .165 -.058 -.B05 -.439 ··.898 ~KASHWIT .214 .165 .036 -.785 -.439 -.874 LWILLOW .218 .165 .094 -.769 -.433 -.858 WILLOW .222 .165 .165 ··.745 -.419 -.:::137 DESHKA .234 .166 .337 -.666 -.355 -./71 SU STA .339 .198 .994 .405 .416 .275 -, ..... I D-3 STAT 1ST I CAL RECORI:I OF 32··YEAR SUmtARY,2 I:1Al't stEI~AR 1 U JANUARY MAINSTEM FLOWS (ers)STANDARD DEVIATION ,.,... LOCATION PRE-POST-7.CHANGE PRE-PUST- D.C.I:IAM 1377.6 10484.8 661.1 390.1 1138.6 PORTAGE 1439.0 10546.2 632.9 41~.J 1746.9 INDIAN 1491.6 10598.8 610.6 437.4 1'75-1.4 CURRY 1532.4 10639.6 594.3 414.1 1757.5 WHISKERS 1546.0 10653.2 589.1 446.3 1"758.5 CHULITNA 2893.lJ 12001.1 .314.7 542.i'1831.9 TALKEET 3579.0 12686.1 254.::';632.1 1816.7 TRAPPER 3590.2 126'}"7.4 2~:i3.7 631\.1 18'77.8 SUNSHINE 3614.8 12721.9 251.9 638.4 1880.1 MONTANA 3756.0 12863.2 2·42.5 656.2 1881.6 SHEEP 3875.3 12982.4 235.0 672.6 1883.6 KASHWIT 4069.5 13176.7 223.8 701.9 1888.0 LWILLOW 4179.9 13287.1 217.9 719.8 1891.2 f"""WILLOW 4316.8 1342".0 211.0 713.2 189~.9 DESHKA 4661.2 13768.3 195.4 80"7.3 1911.1 SU STA 8030.0 17137.2 113.4 1613.1)2279.3 I""" I i I ADDITIONAL STATISTICS LOCATION I:OEF.OF VARIAT. PRE-POST- SKEW CUEFFICIENTS PRE-F'OST- EXCESS COEFFICIENTS PR£:>-F'O:JT- D.C.{/Ali .283 .166 .20"-1.066 -.67"l -.501 PORTAGE .289 .166 .220 -1.064 -.652 -.498... INDIAN /293 .166 .237 ·-1.061 -.627 -.496 CURRY .290 .165 .237 -1.060 -.627 -.498 WHISKERS .289 .165 •2 ~S;!--1.059 -.627 -.498 CHULITNA .188 .153 .020 -1.009 -.705 -.547 TALI<EET .177 .148 .036 -.lJ75 -.389 -.:576 TRAPPER .177 .148 .036 -.974 -.389 ".576 SUNSHINE .177 .148 .036 ••>973 -.389 -.576 MONTANA .175 .146 .098 -.965 -.293 -.~70 SHEEP .174 .145 .157 -.956 -.1<;9 -.365 KASHWIT .172 .143 .261 -.938 -.030 -,5~4 r LWILLOW .172 .142 .322 _.>925 .O6~-.547 WILLOW .172 .141 .396 -.908 .192 -.537 DESHKA .173 .139 .573 -.853 .481 -+504 f"'""SU STA .201 .133 1.177 .0:2;8 1.380 .274 I ! -\ II ..... i I D-4 STATISTICAL RECORD OF 32··YEAR SU~H1ARY ,')(I {:}1-1 SCENARIU FEBRU{.:RY~ HALNSrC:H FLOWS <CFS)STAI~DARD DE::VI::'T :£U l~ LOCATION PRE-POST-X CHANGE PRE-POST--------------------------------_.._-----------~_....._------------------ D.C.DAM 1171.1 10094.4 761.'1 323.4 1'126.6 PORTAGE 122~.6 10148.8 728.1 347.0 1933.0 INDIAN 1272.2 1019~.4 701.4 368.2 1'1:38.8 CURRY 1306.5 1022Y.8 683.0 37..3.]1Y40.9 WHISKERS 1318.0 10241.3 677.0 375.~1941.7 CHULITNA 2443.~11366.8 36~;.2 440.4 :i.~\96.8 TAU<EET 3015.2 11938.5 295.9 519.1 2028.1-TRAPPER 3024.7 11948.0 295.0 520.7 2028.8 SUNSHINE 3045.4 11968.6 293.0 524.3 2030.3 MONTANA 3176.7 12100.0 280.9 541.3 2027.0 SHEEP 3287.5 12210.7 271.4 ::;;~6.9 2024.7 KASHWIT 3468.0 12391.3 257.3 ~84.7 2021.8 LWILLOW 3570.6 12493.9 24'1.9 601.6 2020.7 WILLOW 3697 .t:~12621.1 241.:5 623.7 2019.8 DESHKA 4017.8 12941.1 2~~2.1 683.::.:i 2020.2 SU STA 7148.7 16071.9 124.8 1415.3 220~.9 A[IDI TI ONAl STATISTICS COEF.UF VARIAT.SKEW COEFFICIENTS EXCESS CUEFFIcrENTS LOCATIUN PRE-POST-F·:~:E -POST-PRE::-F'OST- -------------------------------------------------------------------- D.C.DAM .276 .191 •~~61 -1.414 -.667 .,-C".~,)~ PORTAGE .283 .190 .297 -1.410 -.642 .231 INDIAN .289 .190 .34.3 -1.406 -.361 .228 CURRY .286 .190 .344 -1.40~-.::';65 .227 WHISKERS .28S .190 .344 ··1.404 -.3.s7 ").,~.~~J CHULITNA .180 .176 .362 -1.387 -.276 .216 TALKEET .172 .170 .222 .-1.362 -+62~.195 !""'"TRAPPER .172 .170 .222 -1.362 -,625 .lY5 SUNSHINE .172 .170 ')')d')--1.360 -.623 .19-1t....__ MONTANA .170 .168 .287 -1.349 -.613 .181 SHEEP .169 .166 .342 -1.338 -.367 .170 KASHWIT .169 .163 .432 -1.317 -.439 .1~2 LWILLOW .168 .162 .482 --1.303 -.J43 .141 WILLOW .169 .160 .541 -1.285 -.210 .128 DESHKA .170 .156 .673 .-1.232 .157 .095 SU STA .198 .137 1.113 -.313 1.9~1 .297 .... D-5 STATISTICAL RECORD OF 32-YEAR SUMMARY,2 DAM SCENARIO MAINSTEM FLOWS (CFS)STANDARD DEVIATION r i .... LOCATION D.C.DAfi PORTAGE INDIAN CURRY WHIS;(ERS CHULITNA TALKEET TRAPPER SUNSHINE MONTANA SHEEP KASHWIT LWILLOlrJ WILLOW DESHKA SU STA PRE- 1054.5 1099.7 1138.4 1169.0 1179.2 2184.4 2679.6 2688.0 2706.4 2824.9 2924.8 3087.7 3180.2 3295.0 3583.7 6408.0 POST·· 9204.0 9249.2 9288.0 9318.5 9328.7 10334.0 10829.1 10837.5 10855.9 10974.4 11074.3 11237.2 1132rt.7 11444.5 11733.2 14557.5 i.CHAI~GE 772.9 741.1 715.9 697.'2 691.1 373.1 304.1 303.2 301.1 288.5 278.6 263.'-1 256.3 247.3 227.4 127.2 312.6 331.'2 347.8 353.'2 :154.9 432.7 500.9 502.5 505.9 516.9 526.7 543./ 55.3.9 567.0 602.0 1033.9 F'OSf- 1301.2 1310.2 1318.2 1320.9 1:$21.8 135!J.S 13!J7.4 1398.3 14UO.2 1-10'2.7 140:':;.1 1409.5 1112.3 1416.0 1426.7 1(,2::;.0 r i ADDITIONAL STATISTICS r I I LOCATION COEF.OF VAkIAT. F'RE-P08T- SKEW COEFFICIENTS PRE-P08T- EXCESS COEFFlCIENTS ?RE-PUBT- - D.C.DAM .296 .141 .702 -·,1.018 -.127 .165 PORTAGE .301 .142 .699 -1.003 -.198 .140 INDIAN .306 .142 .701 ·,.988 -.243 .119 CURRY .302 .142 .700 -.982 -.244 0109 WHISKERS .301 .142 .700 '·.980 -.244 .105 CHULITNA .198 .132 .489 -.893 -.490 -.032 TALKEET .187 .129 .574 -d:l12 -.112 -.118 TRAPPER .187 .129 .574 -.IH 1 -.112 ·'.121 SUNSHINE .187 .129 .574 -.a07 -.112 -.125 MONTANA 0183 .128 .613 -.784 -.018 -.151 SHEEP .180 .127 .647 '·.764 .0oSl::l -.170 KASHWIT .176 .125 .703 -.729 .219 '-.200 LWILLOW .174 .125 .734 '·.708 .308 -.215 WILLOW .172 .124 .772 -.681 .419 -"')~..",+~~~ DESHKA .168 .122 .862 ••+608 .692 -.266 SU STA 0161 .112 1.248 .23B 1.860 .106 D-6 STATISTICAL RECORD OF 32-YEAR SUMMARY,2 DAM SCENARiO APRIL HAINSTEM FLUWS (CFS)STANDARD DEVIATIUN ..... LOCATION D.C.DAM PORTAGE INDIAN CURRY WHISKERS CHULITNA TALKEET TRAPPER SUNSHINE MONTANA SHEEP KASHWIT LWILLOW WILLOW DESHKA SU STA F'RE- 1283.8 1337.1 1382.8 1419.7 1432.0 2660.7 3238.8 3249.0 3271.2 3398.0 3504.9 3679+1 3778.1 3900.9 420~.8 7231.3 PUST-· a005.8 8059.1 8104.7 8141.6 81!":i4.0 9382.7 9960.8 9971.0 9993.2 10120.0 10226.9 10401.1 10500.1 10622.~ 10731.8 13953.3 i.CHi-'lNGE 523.0 502.7 486.1 473.~ 469.4 252.6_ 207.5 206.~ 205.5 197.8 U 1 1.8 182."1 177.9 172.3 1!:i9.7 93.0 PHE- 367.4 390.8 411.9 419.0 ·"21.J ""'"68_.:;;J .0 678.4 680.5 685.2 701.4 715.9 741.2 756.3 775.8 828.2 1472.8 POSl- 984.3 996.4 1007.4 1011.5 1012.9 1071.4 1164.8 1166.3 1169.6 1186.1 1200.5 122-'.9 123'1.3 12~7.6 1303.9 1a~1.6 ADDITIONAL STATISTICS LOCATIUN COEf.OF VARIAT. PRE-PUST- SKEW CUEFFICIENTS PRE-POST- EXCESS CUEFFICIENTS PRE-·::'U8T·- - ..... - D.C.DAM PORTAGE INDIAN CURRY WHISKERS CHULITNA TALKEET TRAPPER SUNSHINE MONTANA SHEEP KASHWIT LWILLOW WILLOW DESHKA SU STA .286 .292 .298 .295 .294 .213 .209 .209 .209 .206 .204 .201 .200 .199 .19'7 .204 .123 .124 .124 .124 .124 .114 .117 .117 .117 .117 .117 .118 .118 .118 .119 .136 •·781 .819 .8:55 .8~5 .854 .792 .801 .801 .801 .841 .875 .930 .961 .998 1.086 1.482 D-7 '·.237 -.201 '·.169 -.157 '·.153 .060 .272 .275 .281 .303 .323 .357 .376 .401 .465 .982 1.373 1.444 1 •·19~' 1.494 1.193 1.453 .98B .988 .988 1.016 1.0tlS 1.114 1.159 1.221 1.398 2.823 .012 -.(>64 -.123 -.134 -.138 -.o~o .002 .002 .003 .0~3 .099 .177 .224 .284 .442 1.8'74 ~ STATISTICAL REl,;ORlJ OF 32··YEflR SUMMARY,2 DAN Sl,;ENARI0 MAY- MAINSTEM FLOWS (CFS)STANDARD IH::VIATIUN LOCATION PRE-POST-io CHANGE PRE-POST- ______________________________________________4 _____________~______ .....D.C •DAM 12296.7 7656.8 -37.7 3839.7 1~29.4 I PORTAGE 12859.3 8219.4 -36.1 1050.8 172~.2 INDIAN 13341.0 8701.1 -34.8 4239.1 1912.5 CURRY 13651.1 901 07.2 o_,~4.0 4320.8 1991.4 WHISKERS 13762.8 9122.9 -33.7 4348.2 2018.1 CHULITNA 23:570.<;18'131.0 ..019.7 7412.1 5605.2 TALKEET 27743.3 23103.4 -16.7 8372.3 654(.1.5 TRAPPER 27830.6 23190.7 '·16.7 8398.6 6~66.() SUNSHINE 28020.9 23380.9 -16.6 8456.0 6621.5 MONTANA 29096.9 24457.0 -15.9 8~21.1 6666.5-SHEEP 30004.7 25364.8 -15.5 8587.3 6J19.1 KASHWIT 31484.2 26844.3 ·,14.7 8116.1'6833.1 LWILLOW 32324.9 27685.0 -14.4 8802.0 6912.7 WILLOW 33367.3 28727.4 0·13.9 8<;18.8 7025.9 DESHKA 35990.0 31350.1 -12.9 9264.3 7J76.3 SU STA 61646.0 57006.1 -7.::;,15113.'1 13598.1 ,,,..,, A[IDITIONA,L STfHISTICS ~.COEF.OF VARIAT.SKEW COE.FFICIE.NTS EXCESS CUEFFICIENTS LOCATION PRE-POST-PRE-POST-PRE··POST- -------------------------------------------------------------------- I"'"D.C.DAti .312 .200 '.•:549 .320 .523 -1.237 PORTAGE .315 .210 -.517 .311 .482 -1.086 INDIAN .318 .220 ".485 .293 .436 -.980 CURRY .316 .221 -.493 .274 .423 -.972 WHISKERS .316 .221 -.496 .267 .11<;-.969 CHULITNA .314 .296 -.270 .412 .132 .217 TALKEET .302 .283 .••.3 21 .276 011\2 .120!"""TRAPPER .302 .283 -.321 .274 .142,.119 SUNSHINE .302 .283 .0.321 .269 .142 .117 MONTANA .293 .273 -.341 .240 .168 .108.....SHEEP .286 .265 -.352 .220 •HI8 .099 KASHWIT .277 .255 -.360 .198 .21/.085 LWILLOW .272 .250 '·.359 .190 .2:52 .077 WILLOW .267 .245 -.353 .18"1 .24';1 .068 DESHKA .2~7 .235 ·'.314 .200 .280 .050 SU STA .245 .239 .323 .561 .119 -.0:.:.09 D-8 STATISTICAL RECORD OF 3~-YEAR SUMMARY,2 DAM SCENARIO JUNE MAINSTEM FLOWS (CFS)STANDARDDEVIATLUN-LOCATION D.C.DAM PORTAGE INDIAN CURRY WHISKERS CHULITNA TALKEET TRAPPER SUNSHINE MONTANA SHEEP KASHWIT LWILLOW WILLOW DESHKA SU SrA PRE- 26162.9 ~~7072.4 27851.0 28579."7 28823.3 ::;2400.5 ~13957.6 64158.9 64597.4 c~6517.9 68138.3 70779.1 ,'2279.5 ,'4140.0 78821.3 124613.8 POST- 8146.2 905~.7 9834.3 10563.0 10806.6 34383.8 45940.9 461 4}2.1 46580.6 48501.2 50121.6 52762.3 54262.7 56123.2 60804.5 1065',7.1 i~CHANGE -68.9 '·6~.6 -64.7 '-63.0 -62.5 -,,3 <\•4 -28.2 ·-28.1 -27.9 '·27.1 -26.4 -24.9 '·24.3 -22.9 -14.5 PRE- 7071."1 7334.3 7562.7 7725.2 7779.6 11963.1 15000.0 15047.2 15150.1 15366.8 15569.4 15936.4 16164.2 1/)4~5.2' 17305.6 29227.0 POST- 1833.3 2103.0 2344.3 2476.5 2521.8 6962.7 9806.2 9852.4 9"153.1 10167.8 10378.8 10716.4 11029.7 11369.0 12330.8 25537.0 ADDITIONAL STATISTICS LOCATION COEF.OF VARIAT. PRE-POST- SKEW COEFFICIENTS PRE-POST- EXCESS CUEFFICIEHTS F'kE-PUST- D.C.DAM PORTAGE INDIAN CURRY WHISKERS CHULITNA TALi<EET TRAPPER SUNSHINE MONTANA SHEEP KASHWIT LWiLLOW WILLOW DESHKA SU 5TA .270 .271 .272 .270 .270 .228 .235 .235 .235 .231 .228 .225 .224 .222 .220 .235 .~25 .232 .238 .234 .233 .202 .213 .214 .~14 .210 .207 .204 .203 .203 .203 .240 .95(} .907 .871 .872 .873 1.316 .964 .964 ."164 .872 .798 .682 .621 .550 .397 .143 D-9 -.029 -.046 '-.063 -.057 -.053 1.160 .765 .766 .767 .663 .579 .455 .394 .327 .207 .284 1.932 1.782 1.659 1.666 1.66"1 3.305 1.949 1.949 1.919 1.626 1.365 .970 .764 .530 .046 -.:322 -1.467· ·,1.:,H5 -1.261 -,1.198 -1.174 2.171 1.213 1.216 1.223 .260 .074 -.124 -.474 STATISTICAL RECORD OF 32-YEAk SUMMARY,2 DAM SCENARIO JULY MAINSTEH FLOWS (CFS)STANDARD D~VrATrUN LOCATION D.C.DAM PORTAGE INDIAN CURRY WHISKERS CHULITNA TALKEET TRAPPER SUNSHINE MONTANA SHEEP KASHWIT LWILLOW WILLOW DESHKA SU STA PRE- 23213.3 23909.6 24505.7 ~!5238.4 25483.4 5316',.0 64309.8 lJ4512~1 64953.0 CJ7180.1 ~)9059.2 i~2121.5 i~3861.4 i~6018.9 81447.4 134549.6 f'OST- 7094.5 7790.8 8386.9 9119.6 9364.6 37048.2 48191.0 48::-593.3 48834.2 51061.3 52940.4 56002.7 57742.6 59900.1 65328.6 118430.8 ~CHANGE -69.4 ·'07.4 -65.8 '-63.9 -63.3 -30.3 -25.1 ·,25.0 -24.B ·-24.0 -23.3 -21.8 '-21.2 -19.8 -12.0 PRE- 4067.8 424~.3 4399.6 4497.1 4529.7 7644.7 9266.1 929:5.2 9358.7 9458.2 9550 d~ 9718.4 9822.4 ':i'S':59.8 10344.9 16035.1 F'UBT- 1340.5 1479.2 1610.4 16'i6.9 1726.3 5185.1 6682.8 6711.2 67'73.2 68~O.5 6!i28.2 7078.4 J176.2 730':i'.2 7697.3 13778.8 ADDITIONAL.STATISTICS COEF.OF VAFHAT.SKEW COE.FFICIENTS E.XCESS COEFF I CIEWrS LOCATION PRE-POST-PRE-POST-PRE-P08T- --------------------------------------------------------------------- D.C.DAM .175 ,189 .647 .392 .10'1 -1.313 PORTAGE .178 .190 .657 .387 .133 .,j .152 INDIAN .180 ,192 .664 .394 .153 -1.010 CURRY .178 .186 .655 .402 .138 ··.966 WHISKERS .178 .184 .652 .405 .133 -.951 CHULITNA .144 .140 .458 .577 -.45:::;".336 TALKEET .144 .139 .354 <>~~~-.370 -.418.,;)~o TRAPPER .144 .139 .354 .355 -.370 -.419 SUNSHINE .141 ,139 .354 .355 -.370 -.419 MONTANA .141 .134 .368 .370 -.322 ·-.:564 SHEEP .1JS ,131 .381 .386 -.274 -.301 KASH(,JIT .135 ~126 .404 .418 -.184 -.166 LWILLOW .133 .124 .417 .439 -.12'7 -.075 WILLOW .131 .122 .434 .466 -.051 .049 DESHKA .127 .118 .478 .538 .158 .395 SU STA .119 .116 .731 .S48 1.666 2.110 D-IO STATISTICAL RECORII OF 32-YEAR SUMMrIF;Y,:2 DAN SCENARrU AUGUST HAINSTEM FLUWS (CFS)STANOARl.)})EVIATl:UN LOCATION PRE-POST--i.CHANGE f'RE-POST- ------------------------------------------------------------------- D.C.DAM :W9~~.6 11:533.7 .-4\5.9 4/'2~.13 13Y6.3 PORTAGE 21629.9 12008.0 -44.5 491Y.3 1681.3 INDIAN 22207.3 12585.3 -4::5.3 5092.4 17B2.0 CURRY 22853.1 13231.2 -42.1 ~214.6 lBS6.9 WHISKERS :~3069.0 134 4'7.1 -411 •7 5255.6 HIB3.4 CHULITNA 46115.6 36493.7 -20.9 9078.";SY59.9 TALKEET ~:i6684.8 47062.9 '-17.0 11761.1 8,;)27.4-TRAPPER 56863.2 47241.3 -16.Y 11798.1 8363.3 SUNSHINE 572~1.8 IJ762Y.9 -16.8 11878.l:J l:J4'11.6 MONTANA :59065.7 49443.8 -16.3 11921.Y 845Y.6 SHEEP ~~0596.2 50974.3 -lti.Y l1Y66.8 8486.8 KASHWIT 63090.2 ~3468.3 -1~.3 1205~.9 8554.2 LWILLOW 64507.3 ~48H5.4 -14.ft 12115.4 l:J60::;.1 WILLOW 66264.5 56642.6 -14.5 1219'1'.8 8680.4 DESHKA 70685.8 61063.9 -13.(1 12446.3 8Y28.2 SU STA 113935.4 104313.~-8.4 17221.9 1 Jl2B!:L5 ADDITIONAL !:)TATIBTrCS eOEF.OF VARIAT.SKEW COEFFICIE.NTS EXCESS CUEF-FIl,;lENTS LOCATION PRE-PUBT-Pl';:E-PUST-~--P:~E-f'U~n- --------------~----------------------------------------------------- D.C.DAM .225 .141 1.450 3.318 2.369 11.149 PORTAGE .227 .140 1.455 3.457 2.329 11.819 INDIAN .22Y .142 1.458 3.407 2.2YO 11.578 CURRY .228 .140 1.449 3.376 2.26Y 11.~H4 WHISKERS .22B .140 1.446 3.360 2.262 11.462 CHULITNA .197 .163 1.112 1.123 2.296 3.016 TALKEET .207 .177 .BOl .676 1.210 1.715 TRAPPER .207 .177 .801 .677 1.210 1.714 SUNSHINE .207 .177 .801 .679 1.210 1.712 MONTANA .202 .171 .820 .723 1.216 1.752 SHEEP .197 .166 .834 .7:35 1.216 1.774 KASHWIT .191 .160 .849 .797 1.20~1.786 LWILLOW .188 .157 .854 .B15 1.201 1.780 WILLOW .184 .1~3 .858 .832 1.188 :i••761 DESHKA .176 .146 .B51 .844 1.139 1.662 SU STA .151 .137 .317 .229 .447 .319 D-ll "'"' STATISTICAL RECORll OF 32-YEAR SUtH1ARY,')DAN SCEHARrU SEF'TEMB.:. MAIN3TEN FLUWS (CFS)3TANDAI<D rn::Vlt-tT ION LOCATION F'RE-POST-~CHAHGE PRE-F-'OST- __________________________________________0=_______________________ D.C.DAM 12449.1 9603.0 -22.9 3613.9 2331.7 PORTAGE 12929.2 10083.1 ·-22.0 3'79..3.2 2397.6 INDIAN 13340.2 10494.2 -21.3 3950.6 21l6'i.3 CURRY 13702.4 10356.3 ·-20.8 '1043.0 251:1.5 WHISKERS 13823.4 10977.4 -20.6 4074.0 2~29.0 CHULITNA 25768.0 22921.9 --11 .0 7098.0 5116.6 TALKEET 31786.3 28940.2 -9.0 8835.8 6815.0 .....TRAPPER 31886.3 29040.2 ·-8.9 8863.6 6840.Cl SUNSHINE 32104.2 29258.2 -8.9 8924.2 6896.3 MONTANA 33241.7 30:-.s95.7 -8.6 9021.0 7u18.5 SHEEP 34201.5 31355.5 -8.3 9114.8 -J136.5 KASHI.HT 35765.6 32~J19.6 ·-8.0 9290.7 73:::;6 •.-l LWILLOW 36654.3 33808.2 -7.8 9402.<}"7495.5 WILLOW 37756.3 34910.2 ·-7.5 9353.6 7681.4 DESHKA 40529.0 37682.9 -7.0 9986.2 8207.7 SU STA 676~1.7 64805.6 -4.2 16667.4 15638.2 ADDITIONAL STATISTICS COEF.OF VARIA1.SKEW COEFFICIENTS EXCESS CUE::FFICIEHTS LOCATION PRE-F'OST-F'RE-POST-F'RE-f'UST- -------------------------------------------------------------------- D.C.DAH .290 .243 .282 1.967 -.44B 3.010 PORTAGE .293 .238 .295 2.088 -.467 3.435 INDIAN .296 .235 .307 2.145 -.482 3.692 I"-CURRY .295 .232 .307 2.142 -.489 3.747 WHISKERS .295 .230 .307 2.139 -.491 :.5.760 CHULITNA .275 .236 .654 1.820 .577 4.905 TALKEET .278 .235 .613 1.325 .357 2.868 TRAPPER .278 .236 .613 1.322 .357 2.855 SUNSHINE .278 .236 .613 1.314 .~57 2.827 MONTANA .271 .231 .598 1.313 .375 2.891 SHEEP .267 .228 .582 1.:302 .383 2.909 KASHWIT .260 .223 .551 1.266 .381 ::?873 LWILLOW .257 .222 .532 1.:238 •.372 2.822 WILLOW .253 .220 .507 1.19-;.354 2.733 DESHKA .216 .218 .441 1.!)79 .278 :l.421 SU STA .246 .241 .119 .375 -.528 .126 .... D-12 - i~ ,..... - - - - APPENDIX E MONTHLY FLOW PROFILES FOR NATURAL AND TWO-DAM OPERATIONAL CONDITIONS -Ill!1611 14B 12a 1mB DlSTAIII IMD - FLOW PROFILES --2 DAM SCENARIO IIlIIIlER FUJV ([fS) 2llllIl2 ""'"' Pm'ROJECT I_I ~I_I POSTPRllIECT -14""-- ---I121Bl--- 1- llIBl r- IM 41Bl 2IBl B 2llII 1111 1611 14ll 128 1111 111 611 28 B D1STMaOm FLOW PROFILES --2 DAM SCENARIO JMfJARY FUJV([fS) 2IB1l-PREPROJECT IBl1l1l I 16lBl POSTPROJECT I 141l1lll .J-.-J---12al1il / --- r-IIlllllll !III! r-liIB! QI... 4lBl ...co '"... etl 2alIil B 2llII 1111 1611 14B 1211 I'll III 2ll DISTMa (M)) E-2 ~ I FLOV <CFSl FLOW PROFILES --2 DAM SCENARIO FEBRUARY 2llil8ll PREPRWECI IB00ll 161l1l1l POSIPROJECT 148 ---120 19l1l1i1 B00ll 6ilIl0 41B1 2lBI B I- r-I / I- .I--r r---/ ....--- - f-, - OJ...-....... S .>II "j ~..OJ '"'"Qj I ~..'"I-..u .5~-.........." ., ~I 8 I ti "1 I I 1 I "'I ,....,FLOW PROFILES --2 DAM SCENARIO AlmiT FlOV (CFS> lSllBlI8 PREPRllJECT IEllll! 12Illl00 POSTPROJECT 11lSIl00 ---!B111l 7SIl1ll 6llIil1ll -4_ .....Dill I 1_-8 all lIB 16IiI 148 ;1211 100 IB 2IJ DISTAN:E am FLOW PROFILES --2 DAM SCENARIO SCPITm FlllV <CFSl ISBa PREPRlIJECT 13SlDl 12B1Bl POSTPRllJECT IIlS1a--i ,--I !mil 7SIDl _Ill f 451111 f ..... 3IlllI111 '"'-'"- ISBlIll 8 2IJll 111I 16IiI 148 1211 111I III 6IiI 211 DIST.ocEOII> £-6 ,- i ..... ..... APPENDIX F NATURAL RIVER TEMPERATURE PROFILES FOR NORMAL AND EXTREME CONDITIONS ...., MinimUlll 1979 Mean ;98~ SUSITNA WATER TEMPERATURES,JUNE Natura]Conditions TEMPERA TURE CC) 15 - MCXEl'IIum r 1977 l~I- 1 ~_.__.-r~ I l- f- L r-L ,~ u-:9~ -----c...-'-'l~.-'---'.-.--..-.--.--..1.-'---.__ .i...J'--'- ·c ..;0 '",.,....C ..'"..'".....c.....u ..u ..c VI ......'"......'"......e ......."....>e 0 ..:3Cl ..'"'-'u I ~Cl I .,',.I .I . 180 17~150 150 14~13il 120 !I0 1~0 90 8~ OlSTANCE (4) SUSITNA ~ATER TEMPERATURES,JULY Natural Conditions r ~inilllJll. 197~ Mean 1980 MaxiD'lUIf 1977 TEMPffi\TURE (C) IS I- -.----.--.~.-._.-.-.-.-._i_: -,"",-".~.-'-.~.-~--L----~---.-_-_:-..-----------,1'-'- IL---- -,.... c ..;0 '",.,....c ..'"..".....c"...u ..u ..c ...........'"'""........e ....::J"">e 0 ..:3Cl ..'"u u ~ ,I I 1'Cl I I i ,I 190 180 170 160 150 14g 130 120 ll~100 90 80 DISTANCE (4)- F-l ~if"l:i:nlJlI'I 19'?J Mean 198~ lo!CI)(i1flU1I'I 1977 15 III SUSITNA WATER TEMPERATURES,AUGUST NQt.vral Canditione T£~PERHURE (0 ---------1--.--"._"__._--_..-----i _ -'--__--L---"---=-=--=--------L~-_- 190 182 170 1611 150 140 13!l 122 100 90 r -. MinilftUai 19711 Mean 1980 1977 DISTANCE 00 SUSITNA WATER TEMPERATURES,SEPTEMBER Natural Conditions, TEMPERA TURE (C) 15 - III f- _._"="="='==:='"=1,__.__'__L"_. =-.=--=-.~- -,,="'-' 5 -l"Q "".;>.""C "'"..'"'"..C"'...u ...u·... c '"....... :l a ....'"""'..........."~2 >a Q -"'".."u 0 I I I 'I Q I I , , t I 100 1811 172 1611 150 1411 13il 1211 110 Iii"gil 8il DISTANCE eM) F-2