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HomeMy WebLinkAboutAPA2745FINAL REPORT -" JUNE 1985 DOCU~ENT No.2745 -, WATER BALANCE STUDIES OF MIDDLE SUSITNA SLOUGHS ALASKA POWER AUTHC)RITY_----.I ~~~c;:3~rn3~@©© ~NA JOINT VENTURI; It CONTRACT TO &'1 MCONSt.Jc:rA.N~rS.INC.INE~RS G1EOLCca,BTB ~"'I..ANN&t=t.SUfllYEYCFte FEDERAL ENERGY REGULATORY CO ....1.8tON "AOJECT No.711. 'I r ---- SUSITNA HYDROELECTRIC PROJECT t1( '4P... F4?e RO.e?45 Document No.2745 Susitna File No.4.2.2.1 RECEIVED .....JUN 21 l~d:> Alaska Dept.ot Fish &Game Susitna Hydro Aquatic Studies SUSITNA HYDROELECTRIC PROJECT WATER BALANCE STUDIES OF MIDDLE SUSITNA SLOUGHS Prepared by R&M Consultants,Inc. Stephen Bredthauer Dave Bjerklie Bob Butera Under Contract To Harza-Ebasco Susitna Joint Venture Prepared for Alaska Power Authority ARLIS Alaska Resources Library &Information SerVices Anchorage.Alaska Final Report April 1985 R23/3 2 List of Tables Li st of Fig u res Acknowledgments TABLE OF CONTENTS PAGE NO. ii iii iv 1.0 Abstract 2.0 Introduction 3.0 Description of Basins 3.1 Slough 8A 3.2 Slough 9 3.3 Slough 11 ~~4.0 1984 Data Collection 4.1 Streamflow 4.2 P reci p itation..... 4.3 Evaporation 4.4 Groundwater Levels 4.5 Aquifer Properties 5.0 Analyses 5.1 Precipitation 5.2 Mainstem -Slough Discharge Relationships 5.3 Storm Runoff 5.4 Water Balance 5.5 Prediction of Post Project Slough Flows ~6.0 Conclusions 7.0 Bibliography C'1 c.o 0')c.o-c.o C'1 0 0 0.....l!') l!')r-- ("'ll ('r,1 ""'"_--I": 1-1 2-1 3-1 3-1 3-2 3-3 4-1 4-1 4-2 4-2 4-2 4-2 5-1 5-1 5-2 5-3 5-5 5-7 6-1 7-1 ",.. -- - '""" R23/3 3 Table Number 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 LIST OF TABLES Description Mean Daily Flow,Slough 8A-1984 Mean Daily Flow,Slough 9 -1984 Mean Daily Flow,Upper Site,Tributary B, Slough 9 -1984 Mean Daily Flow,Lower Site,Tributary B, Slough 9 -1984 Mean Daily Flow,Slough 11 -1984 Footnotes for Slough Discharge Data Mean Daily Flow (USGS Provisional),Susitna River at Gold Creek(June -October 1984) Middle Susitna Precipitation Gages Middle Susitna River,1984 Precipitation Data Evaporation Data,Watana Camp,1984 Falling Head Test Results,Slough 9 Boreholes Monthly Precipitation and Probability of Exceedance, Talkeetna,Alaska,June-September,1981-1984 1984 Geographic Distribution of Precipitation, Middle Susitna River Monthly Precipitation Totals,Middle Susitna River Storm-Specific Precipitation Totals Precipitation Coefficients for Transfer of Recorded Data Regression Equations for Slough Discharge vs.Mainstem Discharge Storm Runoff Analyses,Slough 9 Tributary Monthly Water Balance,Sloughs 8A and 11 Monthly Water Balance,Slough 9,Tributary 9B Estimated Daily Runoff,Slough 8A,High Rainfall Pattern ii - R23/3 4 Table Number 5.11 5.12 5.13 5.14 LIST OF TABLES (Continued) Description Estimated Daily Runoff,Slough SA,Moderate Rainfall Pattern Estimated Daily Runoff,Slough SA,Low Rainfall Pattern Estimated Daily Runoff,Slough 9,Moderate Rainfall Pattern Estimated Daily Runoff,Slough 9,Low Rainfall Pattern iii - -. R23/3 5 Figure Number 3.1 3.2 3.3 3.4 4.1 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 LIST OF FIGURES Description Middle Susitna River Slough 8A Slough 9 Slough 11 Groundwater Level vs.Mainstem Flow, Slough 9 Monthly Rainfall Exceedance Curves, Talkeetna,Alaska Precipitation Exceedance Curves,June, Talkeetna,Alaska Precipitation Exceedance Cu rves,July, Talkeetna,Alaska I Precipitation Exceedance Curves,August, Tal keetna,Alas ka Precipitation Exceedance Cu rves,September, Talkeetna,Alaska Linear Regression Curves,Slough Discharge vs.Mainstem Discharge Log Transformed Regression Curves,Slough Discharge vs.Mainstem Discharge Slough 9 Streamflow Patterns,1984 iv !~ - R23/3 6 ACKNOWLEDGMENTS The 1984 data in this report were collected,reduced and analyzed by R&M Consultants under contract to Harza-Ebasco Susitna Joint Venture as part of the Susitna Hydroelectric Project,a project of the Alaska Power Authority. This report was authored by'Dave Bjerklie,Stephen Bredthauer,and Bob Butera of R&M Consultants,I nco Review was provided by Don Beaver of Envirosphere Company.Field work was accomplished by Bill Ashton,Dave Bjerklie and Bob Butera.The Alaska Department of Fish and Game -Su Hydro is also acknowledged for the use of their field camp,monitoring of precipitation data and assistance with data collection. v - - R23/3 7 1 .0 ABSTRACT Groundwater discharge into sloughs along the Middle Susitna River main- tains habitat for salmon spawning,rearing of the juvenile salmon and the incubation of salmon embryos.The operation of the proposed Susitna Hydroelectric Project upstream of these areas would change the flow regime in the river.The effects of these changes in flow regime on the groundwater discharge into the sloughs were studied. Analysis of previously collected data and rainfall-runoff data collected du ring 1984 lead to the following conclusions: - .- - 1. 2. Groundwater flow into the slough is related to the stage in the river. The gradients in the alluvial deposits are controlled by the river stage.Also,a percentage of the ground water contributed to the slough originates from the river.The effects vary from slough to slough,being dependent on local stratigraphy,gradient,and slough I morphology.Relationships have been developed for Sloughs 8A,9 and 11. Upland groundwater is a significant source of water to some sloughs. This also varies between sloughs.The availability of this water to the sloughs depends upon that portion of the watershed area which has deeper soils,preventing rapid runoff. 1-1 - - R23/3 9 2.0 INTRODUCTION On the Susitna River,side sloughs are defined by the Alaska Department of Fish and Game (ADF&G,1983)as the sidechannel or adjacent wetted habitats to the mainstem Susitna River which periodically receive a portion of their surface water from the mainstem Susitna River in addition to other sources.Numerous sloughs exist between Talkeetna and Devil Canyon,an area referred to as the middle Susitna River.Some of these sloughs provide spawning,rearing,and incubation habitat for chum,pink and sockeye salmon.For the years 1981-83 the estimated total number of these species using these sloughs for spawning are as follows:1,100 -2,200 sockeye;2,400 -5,100 chum;0 -300 pinks. The major characteristic of these sloughs which makes them suitable habitat for salmon spawning,rearing,and incubation is the continuous flow of water through the year,either as surface or intragravel flow.The sources of this flow and the manner in which it would be affected by the I regu lation of flow in the Susitna River have been the focus of studies that have been in progress since 1982.Previously published reports include Acres American (1983),R&M Consultants (1982),and Alaska Power Authority (1984). The purpose of this report is to present both 1984 data and additional analyses of the hydrologic conditions at selected sloughs in the middle Susitna River.Data from previous years have not been included.To further refine previous estimates of groundwater flow into Slough 9,falling head tests were conducted at three wells.Water levels were also continuously monitored at two wells.Instead of fu rther attempting to separate the local and mainstem components of groundwater flow into Slough 9,an attempt was made to di rectly measu re the flow which the uplands contributed to the slough.Additional streamgages and pre- cipitation gages were installed at and near Slough 9 in order to conduct a water balance study.I n addition,streamgages were maintained on Sloughs 2-1 R23/3 10 8A and 11 to continue to document flow on sloughs which rarely receive mainstem flow. 2-2 R23/3 11 3.0 DESCRIPTION OF BASINS Three sloughs (8A,9,and 11)were studied in 1984.The relative locations of each of the study sloughs are shown in Figure 3.1. The following basin descriptions are modified slightly from those by ADF&G -Su Hydro. 3.1 Siough8A -RM 125.3 Slough 8A is located at River Mile (RM)125.3 on the left ban k of the Susitna River (Figures 3.1,3.2),just downstream of Slough 9.The slough is approximately two miles long and cuts inland from the mainstem Susitna through its historic floodplain until it intersects the steep upland slopes and the Alaska Rail road railbed.The slough then parallels the mainstem until emptying into a side channel.The ban ks range from low,gently sloping ban ks to five-foot high steep cut banks.The overall slough gradient is 10.5 feet/mile. Cobble/boulder substrate predominates in the upper half of the slough.G ravel/rubble is the predominant substrate in the lower half of the slough.Silt/sand deposits are found in the backwater area at the mouth and in the pools. A backwater a rea extends approximately 1,000 feet upstream of the mouth during periods of moderate to high mainstem discharge.Above the backwater area is a 100-300 foot long riffle followed by a large beaver dam.There is a second channel besides the main connection of the slough to the mainstem.This channel flows into a large pool behind the beaver dam.The controlling discharge of the northwest channel IS 27,000 cfs,while that of the upstream channel is approximately 33,000 cfs.The non-overtopped flow in Slough 8A is composed of groundwater input and surface runoff.There are numerous small streams which drain off the upland slopes directly into 3-1 R23/3 12 the slough.Bedrock is exposed on the slopes,and rapid runoff occurs. 3.2 Slough 9 -RM 128.3 Slough 9 is a 1.2 mile long unobstructed "S"-shaped channel on the left bank of the Susitna River,midway between Curry and Gold Creek (Figures 3.1,3.3).Both the head and mouth of the slough open into side channels of the mainstem Susitna River.The lower h~lf of the slough has a relatively shallow gradient which steepens past a point where the slough makes a sharp bend,roughly 3,000 feet upstream of the mouth.The overall slough gradient is 13.7 feet/mile.Gravel/rubble substrate is predominant in the lower half of the slough,while cobble/boulder substrate predominates in the upper half.Silt/sand deposits are found in the pool areas and the backwater area at the mouth.The area at the mouth consists of sand bars that are in a constant state of change.The banks generally I have a moderate to steep slope and are 3-4 feet high.A small slough (9B)branches off in a northeasterly di rection near the head of Slough 9.The Alaska Railroad parallels the southeast bank of the lower half of the slough. The head of the slough has an initial breaching discharge of 16,000 cfs.Below this discharge the upper half of the slough is primarily dry,with an intragravel flow of water.At controlling discharge conditions of 19,000 cfs or above,river water flows freely through the slough,changing it to a completely turbid environment. At mainstem discharges less than 12,000 cfs the backwater area at the mouth extends 500 feet upstream to the base of the first riffle.At higher mainstem discharges,the riffles are inundated and the lower portion of the slough becomes one long pool.The lower half of the slough is a series of pools and riffles ending with the backwater area at the mouth.Base slough flow is maintained by two small tributaries 3-2 - ...., R23/3 13 and contributions from groundwater percolation (upwelling).The upstream tributary was gaged at 2 locations in 1984.This tributary originates at a small lake at elevation 1900 feet,draining the steep upland areas before becoming ponded on the uphill side of the railroad tracks and meeting another small drainage.After flowing through culverts under the railbed,the creek flows through a meadow into Slough 9.The stream is occasionally dammed by beavers,both upstream of the railroad tracks and between the tracks and Slough 9. 3.3 Slough 11 -RM 135.3 Slough 11 is approximately one mile long and is located on the left bank of the Susitna River (Figures 3.1,3.4).Both the head and the mouth of the slough join side channels of the mainstem Susitna River. The slough has a winding channel that is a series of pools and riffles,with an overall gradient of 19.8 feet/mile.Substrate in the I upper half of the slough is composed mostly of cobbles/boulders,with the lower half composed of gravel/rubble.Silt/sand deposits are confined mostly to the backwater pool at the mouth.This pool is formed by a relatively stable sand/gravel bar at the mouth. Slough 11 is a very recently formed featu re of the Middle Susitna River.Local residents have indicated that this slough was created in May of 1976 by an extreme ice jam event on the mainstem which shunted flow from the mainstem through the adjacent floodplain, carving out the slough.The slough has a breaching discharge of approximately 42,000 cfs and was last breached in June 1984.I n an unbreached state,intragravel flow can be observed entering the slough through the berm at the head.However,this flow is minimal, and below breaching discharges most of the upper third of the slough is dewatered with isolated shallow pools.Groundwater input maintains a year-round flow of water in the lower two-thirds of the slough. The backwater pool at the mouth exhibits considerable fluctuation in 3-3 R23:/3 14 direct response to changes in mainstem discharge.The backwater area is quite broad,encompassing the entire slough width,in contrast to the narrow channel in the rest of the slough. The flow in Slough 11 is very steady.It varies by only a few cfs throughout the year,except for the few times it is overtopped. There are no streams which feed the slough.The streamgage in Slough 11 was located 250 feet upstream of the mouth of the slough in order to avoid the existing backwater effects. 3-4 R23/3 16 4.0 1984 DATA COLLECTION 4.1 Streamflow Five stream gaging stations were established and maintained during 1984 to define the flow characteristics on three sloughs.Three of these stations were in Sloughs 8A,9 and ",while the other two were located on a major tributary stream to Slough 9.Gaging locations are shown on Figures 3.2,3.3 and 3.4.Average daily discharges at each site are tabulated in Tables 4.1 through 4.5,with footnotes in Table 4.6.All gage sites consisted of a stilling well and a float-operated Stevens Type F recorder.Rating curves were developed at each site to relate the rate of flow to the measu red stage.Biweekly servicing of these gages allowed 8-10 discharge measu rements to be made at each site.At one site (the gage on the upper part of the slough 9 tributary),a weir was installed to allow accurate measurement of the flow in an area where no suitable natural I controls existed.Prior to August 13,1984,this was a 90°V-notch weir.After this date a suppressed rectangular weir with a crest length of 1.97 feet was used. USGS provisional mean daily flow data for the Susitna River at Gold Creek are included as Table 4.7 Flow measurements were made at two sites at Slough 11 on September 12,1984.On this date the stage in the mainstem was low enough to eliminate the backwater area which usually exists at the lower end of Slough 11 and which sometimes extends almost all the way to the gage.A discharge of 5.64 cfs was measured 1250 feet downstream of the gage,while 2.62 cfs were measured at the gage.The slough had gained over 3 cfs in the 1250 foot stretch.Large amounts of water were observed entering the slough from the upland side of the slough. 4-1 .~ - R23/3 17 4.2 Precipitation At the beginning of the 1984 field season there were three weather stations in the middle Susitna River basin,the Talkeetna NOAA sta- tion and the Devil Canyon and Sherman Stations from the Susitna Hydroelectric Project.The Devil Canyon site has provided precipitation data for the summer months since 1981.The Sherman site was installed in May 1982.However,the precipitation recorder at this site worked only intermittently from mid-August 1983 to August 21,1984,when the site was repaired. Five additional rain gages were installed in the basin in 1984.These sites are described in Table 4.8.Daily and cumulative precipitation values are tabulated in Tables 4.9(a)-4.9(g). 4.3 Evaporation I Pan evaporation data have been collected at Watana Camp since 1981. The daily and monthly values for 1984 are tabulated in Table 4.10. 4.4 Groundwater Levels Fluctuations in the groundwater table were measured continuously at two sites in the Slough 9 area.Boreholes were instrumented with pressure transducers con nected to Omnidata Datapod recorders. Fluctuations in groundwater levels are plotted along with mainstem discharge at Gold Creek on Figures 4.1 (a)-4.1 (k). 4.5 Aquifer Properties Aquifer properties in the areas near the sloughs have not previously been well defined.An attempt was made to conduct a rising head pump test at Well 9-1 at Slough 9.However,the test was not suc- cessful in providing usable data with which to estimate aquifer 4-2 - R23/3 18 properties.Subsequently,falling head tests were made at well sites 9-1, 9-2,9-3 and 9-4.The data were analyzed using the technique described by Cooper,Bredehoeft,and Papadopulos (1967).The resulting transmissivity values determined from the data are tabulated in Table 4.11. 4-3 - R23/3 20 5.0 ANALYSES 5.1 Precipitation In the small drainage basins of the sloughs,daily precipitation is more significant than total monthly precipitation when estimating peak local runoff.The small basins a re likely to have short runoff periods of concentration,and would respond rapidly to local precipitation. Consequently,daily and monthly precipitation records at Talkeetna for the period 1943-1983 were reviewed to determine if the summer precipitation records for 1981-1984 were unusual in any way.The total monthly precipitation values were ranked in order,and are plotted on the monthly cumulative percent frequency curves on Figure 5.1.The 1984 monthly precipitation totals are included on this figure.The probabilities of the total monthly precipitation exceeding the values for the June,July,August and September for 1981-1984 are in Table 5.1.It can be easily seen that summer of 1981, I June-July 1982 and August 1984 unusually wet;August 1982 and July 1984 were average;June-July 1983,June 1984,and September 1984 were very dry;and August 1983 was wet.This pattern can also be observed in the precipitation exceedance curves for the months of June through September (Figures 5.2-5.5). Daily precipitation values have been previously summarized in Table 4.9.Data from four periods have been summarized in Table 5.2 for the 1984 network in the middle Susitna basin.Monthly and specific storm data from the continuous recording gages at Devil Canyon, Sherman,and Talkeetna have been summarized in Tables 5.3 and 5.4. Examination of the above data indicates the following general trends for summer precipitation along the Susitna River between Tal keetna and Devil Canyon. ".,.. (a)Local elevation changes precipitation.As seen have little or no affect on summer in Table 5.2,precipitation at Curry is 5-1 -. - ....., R23/3 21 similar at elevations 500 and 1750 feet.During September 13-25, precipitation at the Sherman (elevation 1900 feet)and 4th of July Creek (elevation 1600 feet)stations are about equal,and only slightly higher than that at the lower Sherman site (elevation 700 feet).Similarly,precipitation at both Sherman sites is nearly equal during the intense rainstorm of August 21-26,1984. (b)Summer precipitation varies longitudinally along the Susitna River.Du ring the two significant rainfall periods noted in Table 5.3 (August 13-27 and September 13-25),rainfall at Curry was 57-71 percent greater than that at Talkeetna.Rainfall amounts then decreased upstream from Curry,with the Devil Canyon site receiving the least precipitation.This general trend seems to hold true in the monthly and other storm-specific data in Tables 5.3 and 5.4,although it varies from storm to storm. Coefficients for transferring precipitation data to ungaged areas along the middle Susitna River are shown in Table 5.5. 5.2 Slough Discharge -vs.-Mainstem Discharge Linear and log-transformed regression equations relating slough dis- charge to mainstem discharge were determined for Sloughs BA,9,and 11.The resulting equations are shown .in Table 5.6,with the re- gression lines on Figures 5.6 and 5.7.Regression analyses were also conducted using slough discharge lagged by one and two days from mainstem discharge,but the regressions did not improve the deter- mination coefficient. At Slough BA,the equation developed using low-flow data (mainstem flow less than 12,500 cfs)explained significantly more variance than that using mainstem discharges up to 27,000 cfs.Under natural low-flow conditions,local runoff is less likely to be making a significant contribution to slough discharge.Slough discharge during 5-2 - - - R23/3 22 these periods is more closely related to seepage affected by variations in mainstem discharge,and would not be affected by local runoff. Only data from periods when the upstream berm was not overtopped were used for analyzing Slough 9.Maximum discharge from Tributary B was only 0.18 cfs during this period (September 3 October 31,1984),so Slough 9 flow was primarily from seepage. However,there was significant water loss in the tributary between the upper and lower gaging sites.The water may have re-emerged as seepage in the slough. Data at Slough 11 were collected during non-overtopped periods.No su rface water tributaries flow into Slough 11. 5.3 Storm Runoff Runoff from a drainage basin is influenced both·by climatic factors I and physiographic factors (Chow,1964).Climatic factors include the forms and types of precipitation,interception,evaporation,and transpiration,all of which exhibit seasonal variations.Physiographic factors are fu rther classified into basin characteristics and channel characteristics.Basin characteristics include such factors as size, shape,and slope of drainage areas,permeability and capacity of groundwater formations,presence of lakes and wetlands in the basin, and land use.Channel characteristics are primarily related to the hydraulic properties of the channel which govern the movement of streamflows and determine channel storage capacity.Many of the above factors are interdependent to a certain extent,and can be highly variable in nearby basins. Precipitation and stream discharge data were collected in 1984 to determine storm runoff,water balance and mainstem-slough flow relationships.At Slough 9,the upstream berm was breached continu- ously from June 4 through August 15 and from August 19 through 5-3 R2:1I3 23 August 30,so storm runoff could not be analyzed.However,flow data were collected at two sites on the tributary entering the upper part of the slough,so direct storm runoff could be analyzed at these sites.Storm runoff analyses for the Slough 9 tributary for the rainfall periods of August 17-25 and September 15-20,1984 are summarized in Table 5.7 with flow patterns shown on Figure 5.8. The upper and lower gages indicated a runoff percentage of about 50 percent in the August storm.However,the percent runoff was considerably less in the September ,storm,dropping to 12 percent for the upper site and 1.6 percent for the lower site.Several possible reasons may exist for the significant changes in runoff percentages, including: ~,(a)The volume,intensity,and timing of rainfall.The August storm was more intense and had a much greater precipitation volume. ."-High rainfall rates occurred early in the August storm, saturating the ground early in the storm and resulting in higher I runoff rates later.In the September storm,the higher rainfall r amounts did not occur until late in the storm. (b)Antecedent moisture.The August storm followed a 1-week period of no precipitation,while the 3 weeks prior to the Sep- tember storm had little or no precipitation.The soil mantle was probably drier in September,therefore absorbing more moisture before surface runoff could occur.The precipitation timing previously mentioned also affected soil moisture. (c)Groundwater levels.The water level in well 9-3 was about 2 feet lower during the September storm.This likely affected the rate of water loss between the upper and lower gages on the tributa ry.During the August storm,mainstem flow of the Susitna River at Gold Creek was about 20,000 cfs greater than in the September storm. 5-4 - ,.... - - .... R2:V3 24 5.4 Water Balances Monthly water balances were estimated for July through October for Sloughs 8A and 11 and the two sites on Tributary 9B of Slough 9 (Tables 5.8 and 5.9).Monthly precipitation at each site was determined from either gages at the site or from nearby gages adjust- ed by the coefficients in Table 5.5.Evaporation was estimated by using the 1984 pan evaporation data from Watana Camp,multiplied by 0.7.Flow data were recorded at the gaging stations. At Slough 8A,62-73%of the available precipitation ran off during July,September and October.The high percentage of 124%in August reflects the storm in late August,in which the upstream berm of the slough was Ii kely overtopped for a short period of time, affecting the runoff values.Precipitation not running off as surface flow would remain as groundwater,and could seep into the slough during a later time period.However,slough discharge is very low I CO.1 cfs)by late October. Slough 11 maintains a relatively steady flow throughout the summer. Even the heavy rainfall in late August caused only a minor variation in streamflow which was closely correlated to mainstem discharge,as already shown in Section 5.2.This correlation may also be illustrated by comparing average monthly flows for both the mainstem and Slough 11.The corresponding monthly runoff ratios are shown below. 5-5 - Flows (cfs) Susitna River Slough 11 at Gold Creek Slough 11 Runoff Ratio(a) June 26,770 3.17 -0.17 July 23,440 2.82 0.77 August 20,100 2.75 0.44 September 9,380 2.44 1.19 October 5,110 1.45 1.47 (a)(Slough discharge)/(Precipitation -Evaporation) Despite the strong negative balance in June (evaporation far exceeded precipitation),average flow in Slough 11 was the highest for the summer.(Slough 11 was overtopped in June for 3 days but those values are not included in the average monthly flow.)Seepage meter data from 1983 and the strong slough discharge vs.mainstem I discharge correlation in Table 5.6 indicate that Slough 11 is primarily affected by mainstem flow (stage).The lack of su rface tributa ries indicates all precipitation infiltrates into the watershed.The ru noff ratios for Slough 11 are somewhat spurious,since slough discharge would likely have been very similar for similar main stem flows,no matter what precipitation fell on the watershed. The upper gaging site on Tributary B,Slough 9,is at the base of the hillslope,monitoring flow just before the stream reaches the large alluvial fan.The data indicate that most available water runs off as su rface flow,with about 10-20 percent remain ing as groundwater. However,this does not occur at the lower gaging site,which is located near the confluence of Tributary B and Slough 9.From the data in Table 5.9,it is apparent that much of the flow reaching the head of the alluvial fan seeps into the ground.As the water table drops through September and October,reflecting the change in mainstem flow and water level,the tributary loses significantly more 5-6 -------~------------------------- .- - - r R23/3 26 flow than when the water table is high.The rate of water loss from the stream is a function of the groundwater level.The higher the water table,the slower the water is lost from the tributary.The high surface runoff percentage in August is likely due to the intensity of the storm and to the higher groundwater levels (Figure 4.1 (g)). The water loss in Tributary S,Slough 9,likely explains the relatively poor correlation between seepage meter data for meters 9-2 and 9-3 and mainstem discharge.In 1983,both seepage meters 9-2 and 9-3 were located at a spring upstream of the lower gaging site of Tributary B (APA,1984).This site would have been affected both by mainstem stage levels and by water loss from Tributary B. 5.5 Timing of Surface Runoff Local surface runoff may provide sufficient flow for fish access into I the sloughs.However,monthly precipitation records do not provide sufficient time resolution to determine whether surface runoff will contribute an adequate amount of flow in addition to the groundwater. A simple technique was utilized to estimate local daily surface runoff at Slough 8A du ring low,average,and high periods of monthly precipitation at Talkeetna.When combined with the groundwater flow expected under with-project conditions,the runoff estimates provide additional insight into the type of flows expected when the project is operational. The daily surface runoff pattern into Slough 8A was estimated for high,moderate,and low monthly precipitation (Tables 5.10,5.11, 5.12).The recorded slough discharges for August 1984 (high precipitation),September 1983 (moderate precipitation),and September 1984 (low precipitation)were separated into surface runoff and groundwater flow.Groundwater flow was estimated using the regression equation for slough discharge and the average daily flows 5-7 ..- ,- R23/3 27 for the Susitna River at Gold Creek.The estimated groundwater flow was then subtracted from the recorded value.(When the groundwater flow estimate from the regression equation exceeded the recorded value,groundwater flow was reduced to the recorded value.)Su rface runoff was assumed to be the difference between the recorded discharge and the estimated groundwater flow. Although the estimates for surface runoff are not precise,Tables 5.10 through 5.12 do indicate that there are long periods when little surface runoff is contributed to Slough 8A,even in months when precipitation is well above average.In Table 5.10,a 13-day period of zero su rface runoff is indicated,even though the monthly precipitation is exceeded only 20 percent of the time in August. Similar periods of zero surface runoff were indicated for the low rainfall month (September 1984).Surface runoff contributed an estimated 57%,64%,and 15%for the high,moderate and low precipitation patterns illustrated in Tables 5.10 through 5.12. The data in Table 5.10 also indicate that the runoff period extends for several days after a major precipitation event.Apparently,there is sufficient shallow subsurface flow on the valley slopes to maintain the flow for several days. The above technique can also be applied at Slough 9 for periods of moderate-to-Iow precipitation and flow when the upstream berm is not overtopped.The runoff estimate for September 1983 (moderate precipitation,61%exceedance)and September 1984 (low precipitation, 93%exceedance)are shown in Tables 5.13 and 5.14,respectively. Tributary B on Slough 9 drains a lake which covers about 7.35 acres. The presence of the lake will result in a sustained surface flow for most summer conditions.However,the lower mainstem water levels which would occur during summer during projection operation will 5-8 ..- i - - R23/3 28 result in a lower water table in the alluvial fan at the upper end of Slough 9.The lower water table will result in Tributary B losing water to groundwater in the reach between the confluence with Slough 9 and the base of the valley wall. 5-9 ~, R23/3 30 6.0 CONCLUSIONS Th4:!results of the 1984 water balance studies,taken together with results from previous studies in the area,lead to the following conclusions: a.Talkeetna precipitation records,adjusted by an coefficient,may be used to estimate precipitation along Susitna River.The estimated precipitation values may estimate local runoff into selected sloughs. appropriate the middle be used to b.A high percentage of precipitation (60-90%)runs off the steep rock hillslopes above Sloughs 8A and 9.However,the tributary streams may lose a significant portion of their surface flow to groundwater in alluvial fans at the base of the slopes such as at Slough 9.The rate of loss is affected by the depth of the water table. c.Water level in the mainstem is the primary control of the groundwater I level in the alluvial soils adjacent to the sloughs.Under with-project conditions,the reduced groundwater levels will affect the rate of runoff across alluvial fans such as that at Tributary B in Slough 9. d.Strong linear and logarithmic relationships exist at Sloughs 8A,9, and 11 between mainstem discharge and slough discha rge du ring periods when the upstream berm of the slough is not overtopped. These relationships may be used to estimate groundwater discharge under with-project conditions.Sloughs will also receive local surface runoff . e.Examination of watershed characteristics can give an indication of how sloughs which have not yet been studied would react to changes in .mainstem flow,although with-project slough discharges could not be accurately quantified. 6-1 ....R23/3 31 7.0 REFERENCES -1. - 2. Acres American,Inc.1983.Susitna Hydroelectric Project,Slough Hydrology Report,prepared for Alaska Power Authority,March. Alaska Department of Fish and Game -Su Hydro.1983."Susitna .... Hyd ro Aquatic Studies,Phase II Aquatic Habitat and I nstream Flow Temperature Data". Basic Data Report,Volume 4: Studies,1982.Appendix C - 3.Alaska Power Authority.1984.Alaska Power Authority Comments on the Federal Energy Regulatory Commission Draft Environmental Statement of May 1984,Volume 9,Appendix VII Slough Geohyd rology Studies. 4.Chow,V.T. Handbook of York. 1964.Runoff.Section 14,in V.T.Chow (editor), Applied Hydrology,McGraw-Hili Book Company,New 5.Cooper,Bredehoeft,and Papadopulos,"Response of a Finite-Diameter Well to an Instantaneous Charge of Water",Water Resources Research, Volume 3,No.1,First Quarter 1967. 6.R&M Consultants,Inc.1982. Hydrology I nterim Report", Incorporated,December. "Susitna Hydroelectric Project,Slough prepared for Acres American -7-1 .- ".... ..,.. R2~V3 32 TABLES 7-2 R23/3 34 TABLE 4.1 MEAN DAILY FLOW,SLOUGH 8A..... Location:Gage was midway along the length of slough 8A. Drainage Area:1.51 sq.mi. Discharge,in Cubic Feet Per Second,1984 Mean Values Day'July August September October 1 5.9 4.1 1.4 2 5.6 3.2 1.4 3 2.6 5.2 2.6 1.3 4 2.6 4.8 2.4 1.3 5 2.4 4.8 2.0 1.2 6 2.2 4.4 1.7 1.1 7 2.2 4.1 1.5 1.0 8 2.0 3.8 1.4 1.0,-9 2.0 4.4 1.2 1.0 10 2.2 4.1 1.2 0.9 11 2.0 3.6 1.0 0.9 12 2.2 3.2 1.0 0.8 13 2.0 2.6 1.0 0.7 14 2.0 2.4 0.9 0.6 15 1.7 2.2 0.8 0.6 ~16 1.5 2.0 0.9 0.5 17 1.2 1.7 0.9 0.4 18 1.5 2.6 1.2 0.4 19 1.7 4.1 1.7 0.3 20 2.2 4.8 2.2 0.3 21 2.2 5.2 2.2 0.3 22 2.2 5.9 2.2 0.3 23 2.2 8.0 2.2 0.4 24 2.2 34.0 2.0 0.3 25 2.6 65.0 2.0 0.3 26 4.4 44.0 1.7 0.3 27 5.6 17 .0 1.5 0.2 28 7.1 11.0 1.5 0.1 29 6.2 8.0 1.4 0.1 30 8.4 5.9 1.4 0.1 31 7.1 4.8 0.1 ,- TOTAL 86.4 285 51.0 19.6 Mean 2.98 9.19 1.70 0.63 Max 8.4 65 4.1 1.4 Min 1.2 1.7 0.8 0.1 ..... R23/3 35 TABLE 4.2 MEAN DAILY FLOW,SLOUGH 9 Location:Downstream end of Slough 9 Dralinage Area:2.26 sq.mi. Discharge,in Cubic Feet Per Second,1984 Mean Values Day June July August September October 1 9.1 190 190 18 2.1 2 11 240 130 14 2.1 3 9.7 210 66 11 2.1 4 l1(a)92 56 9.5 2.0 5 11 66 69 7.1 2.0 6 12 65 160 5.6 1.9 7 18 58 170 4.8 1.9 8 23 55 150 4.2 1.9 9 30 53 220 3.6 1.9 10 35 51 200 3.2 1.8 11 30 81 160 2.8 1.8 12 29 62 50 2.4 1.7 13 140 52 40 2.4 1.6 ~.filiII"i'l 14 500 51 24 2.1 1.6 15 440 28 17 2.1 1.6 16 810 20 14 2.1 1.5,-17 41 13 2.1 1.6 18 60 18 2.7 1.4 19 59 34 3.2 1.4 20 52 43 3.6 1.4 21 70 56 4.2 1.3 22 32 100 52 3.6 1.4 23 34 110 43 3.2 1.4 ~24 44 57 300 2.8 1.4 25 59 110 790 3.3 l.4(e) 26 140 590 750 3.3 l.4(e) 27 60 680 480 2.8 1.3(e) 28 27 500 160 2.4 1.3(e) 29 45 410 52 2.4 1.3 (e) 30 65 380 35 2.1 1.3(e) 31 260 25 1.3(e) TOTAL 4,853 4,567 136 50.1 Mean 156 147 4.53 1.62 Max 680 790 18 2.1 Min 9.1 20 13 2.1 1.3 (a)The berm at the upstream end of Slough 9 was overtopped continu- ously between June 4 th rough August 15 and August 19 through August 30. PtI~(e)Estimated values. R2~V3 36 TABLE 4.3 MEAN DAILY FLOW UPPER SITE,TRIBUTARY B,SLOUGH 9 Location:Gage was 150 feet uphill from the Railroad tracks on the tributary stream Drainage Area:0.73 sq.mi. Discharge,in Cubic Feet Per Second,1984 Mean Values Day August September October 1 0.92 1.89 0.80 2 1.02 1.59 0.75 3 1.03 1.48 0.75 4 1.02 1.26 0.75 5 1.08 1.15 0.71 6 1.11 1.10 0.66 7 0.95 0.99 0.66 8 0.85 0.94 0.66 9 1.14 0.90 0.66 '10 1.03 0.84 0.66 '11 0.92 0.75 0.66 '12 0.82 0.75 0.62 '13 0.73 0.78 0.62 .~'14 0.71 0.73 0.57 '15 0.71 0.69 0.53 '16 0.62 0.66 0.49 '17 0.57 0.66 0.49 '18 0.85 0.80 0.45 19 1.89 0.88 0.45 20 2.27 1.10 0.41 ,~21 2.20 1.07 0.38 22 2.53 1.04 0.41 23 3.07 1.02 0.38 ~24 8.89 0.97 0.38 25 14.7 0.97 0.34 26 9.91 0.90 0.30 27 6.23 0.90 0.27 28 4.74 0.85 0.24 29 3.42 0.85 0.20 :30 2.79 0.85 0.18 ~31 2.33 0.18 TOTAL 81.1 29.4 15.6 Ml~an 2.62 0.98 0.50-14.7 1.89 0.80M.!x Min 0.57 0.66 0.18 CFSM 3.59 1.34 0.68.-IN 4.13 1.50 0.80 R2:113 38 TABLE 4.4 MEAN DAILY FLOW LOWER SITE,TRIBUTARY B,SLOUGH 9 Loc:ation:Gage was 400 feet upstream of the mouth of the tributary stream. ,~Drclinage Area:1.46 sq.mi. Discharge,in Cubic Feet Per Second,1984 Mean Values ..- Day June July August September October 1 2.2 1.5 1.7 1.9 0.09 2 2.7 1.4 2.4 1.4 0.09 3 2.4 1.4 1.7 1.2 0.09 4 2.2 1.3 1.3 0.85 0.09 Ii~5 1.8 1.2 1.4 0.45 0.09 6 1.4 1.2 1.4 0.28 0.09 7 1.4 1.2 1.3 0.25 0.09 8 1.1 1.0 1.1 0.16 0.09 9 1.5 1.0 1.7 0.12 0.09 10 0.95 0.95 1.4 0.12 0.08 "0.85 0.95 1.2 0.10 0.08 ~12 0.45 0.90 0.85 0.10 0.08 13 0.45 0.85 0.55 O.10 0.08 14 0.70 0.40 0.10 I 0.08 15 0.60 0.25 0.08 0.08 16 0.45 0.16 0.08 0.08 17 0.65 0.15 0.06 0.08 18 0.70 0.25 O.10 0.07 19 0.45 1.7 0.12 0.07 20 0.35 2.1 0.16 0.07 21 0.45 2.2 0.18 0.07 .~22 0.40 2.3 0.18 0.06 23 1.7 0.40 2.9 0.16 0.06 24 1.5 0.28 16.0 0.14 0.06 25 1.4 0.30 43.0 0.14 0.06 26 1.4 1.7 34.0 0.12 0.06 27 1.6 4.7 14.0 0.10 0.06 28 1.7 2.6 6.6 0.10 0.06....29 1.7 2.5 4.2 0.10 0.06 30 1.6 3.0 3.0 0.10 0.06 31 2.3 2.5 0.06.... TOTAL 37.4 154 9.1 2.3 Mealn 1.21 4.97 0.30 0.07 Max 4.7 43 1.9 0.09 Min 0.28 0.15 0.06 0.06 CFSM 0.83 3.40 0.21 0.05 IN 1.95 3.92 0.23 0.06 .- R23:/3 39 TABLE 4.5 MEAN DAILY FLOW,SLOUGH 11 Location:Gage was 2500 feet upstream of the mouth of Slough 11. Drainage Area:1.69 sq.mi. Discharge,in Cubic Feet Per Second,1984 Mean Values ..... - Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL Mean Max. Min June 1.7 1.6 1.7 1.9 2.2 2.2 2.2 2.4 2.4 2.7 2.7 2.6 2.9 2.9 2.9 3.4(e) 3.9(e) 4.4(e) 4.8 4.4 4.0 4.0 4.0 4.0 4.0 4.0 3.6 3.6 4.0 4.0 95.1 3.17 4.8 1.6 July 3.6 3.2 3.2 3.2 2.9 2.9 2.9 2.9 2.9 2.9 2.7 2.9 2.7 2.7 2.6 2.4 2.4 2.4 2.4 2.4 2.4 2.6 2.4 2.4 2.7 2.9 3.2 3.6 3.2 3.2 2.9 87.7 2.82 3.6 2.4 August 2.7 2.6 2.4 2.4 2.4 2.4 2.4 2.7 2.6 2.4 2.4 2.2 2.2 2.2 2.2 2.2 1.9 2.4 2.4 2.2 2.4 2.6 2.7 3.2 4.4 4.4 4.4 4.0 3.6 3.2 2.9 85.1 2.75 4.4 1.9 September 2.7 2.7 2.7 2.7 2.6 2.6 2.6 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.6 2.4 2.4 2.4 2.4 2.4 2.4 2.2 2.2 2.2 2.2 73.2 2.44 2.7 2.2 October 2.2 2.2 2.2 2.0 2.0 2.0 1.7 1.7 1.7 1.7 1.7 1.6 1.6 1.4 1.4 1.3 1.3 1.2 1.1 1.1 1.1 1.1 1.1 1 1 1 1 1 1 1 1 43.4 iJD 1.0 (e)Slough 11 was overtopped during the period of 6-16 to 6-18.The values listed are estimated non-overtopped flows. R231/3 40 TABLE 4.6 FOOTNOTES FOR DISCHARGE DATA No data available a Overtopping of berm at upstream end of slough provides pa rt of flow - Dailly Mean -Average discha rge over a 24 hou r period in cubic feet per second.This value includes flow from the mainstem if the upstream berm of the slough is overtopped. Total -Total of daily mean discharges for the month. Max -Maximum daily mean discharge for the month. Min -Minimum daily mean discharge,for the month. CFSM Runoff in cubic feet per second per square mile is the average number of cubic feet of water flowing per second from each square mile of area drained.This value is reported only if the data is not affected by the mainstem,either as overtopped flow or groundwater flow.This additional flow from the mainstem does not reflect the natural yield of the drainage basin. IN -Runoff in inches shows the depth of which the drainage area would be covered if all the runoff for the month were uniformly dis- tributed on it.This value is reported only if the data is not affected by the mainstem (See CFSM above)., R23/3 41 TABLE 4.7 MEAN DAILY FLOW (USGS PROVISIONAL) SUSITNA RIVER AT GOLD CREEK Day June July August September October 1 12,200 25,500 22,900 12,500 7,800 2 13,100 24,800 21,500 11,800 8,000 3 15,100 25,100 19,900 11 ,200 7,700 4 17,200 23,200 19,500 10,800 7,350 5 18,000 22,400 20,600 10,400 7,100 6 18,200 22,300 22,800 10,300 6,800 7 19,300 21,900 22,900 10,600 6,700 8 20,300 21,500 22,500 10,800 6,600 9 21,100 21,400 23,900 10,600 6',650 10 21,900 21,200 23,500 9,800 6,800 11 21,500 23,100 22,100 9,300 6,600 12 21,300 21,900 18,500 9,000 6,700 13 25,900 21,200 17,100 9,000 6,150 14 31,500 21,200 15,600 8,700 5,550 15 31,200 19,400 14,600 8,500 5,000 16 40,600 18,600 14,000 8,200 5,000 17 52,000 20,500 14,300 8,100 4,400 18 40,600 21,700 15,200 8,300 4,300 19 33,600 21,600 17,000 9,400 3,800 20 31,500 21,100 18,000 10,400 3,700 21 31,400 22,300 19,400 11,400 3,900 22 30,900 23,000 18,600 10,300 4,300 23 31,100 23,500 17,900 9,000 4,500 24 30,000 21,600 22,700 8,300 4,800 25 28,400 22,300 30,300 7,950 4,000 26 26,600 29,800 31,700 7,650 3,100 ""'"27 28,700 33,500 28,000 7,400 2,700 28 32,000 30,300 21,400 7,200 2,400 29 30,100 27,900 17,300 7,200 2,200 30 27,900 27,000 15,700 7,400 2,200 31 24,700 13,600 2,200 TOTAL 803,200 725,500 623,000 281,500 158,500 MEAN 26,770 23,400 20,100 9,380 5,110 MAX 52,000 33,500 31,700 12,500 8,000 MIN 12,200 18,600 13,600 7,200 2,200 CFSM 4.35 3.80 3.26 1.52 0.83 IN 4.85 4.38 3.76 1.70 0.96 R23/3 42 TABLE 4.8 MIDDLE SUSITNA PRECIPITATION GAGES "..,Downstream to Upstream Order Location River Mile Period of Record Type of Station Talkeetna FAA 97 1941-Present Observer Curry Camp 121 8/1/84-10/31/84 Observer Curry at 1750'121 8/14/84-10/31/84 Collecting buckets checked biweekly. ",,",, Sherman 129.5 6/1/82-9/30/82 Recording tipping bucket. 6/1/83-7/31/83 8/21/84-10/31/84 Sherman at 1900'129.5 6/1/84-7/31/84 Collecting bucket checked biweekly. 8/14/84-10/31/84 Recording tipping bucket. 4th of July @ 1600'129.5 8/14/84-10/31/84 Collecting bucket checked biweekly. Gold Creek 136.5 8/16/84-10/31/84 Observer Devil Canyon 151 7/17/80-Present Recording tipping bucket. - t WI~;~\1 I -l "} TABLE 4.9 (a) MIDDLE SUSITNA RIVER PRECIPITATION DATA -(Inches) May 1984 1 Station Ta I keetna Curry Elevation 345 500 Day 1 0.19 2 0.10 3 T 4 0.16 5 0.10 6 O.01 7 0 8 0 9 a 10 a "0 12 0 13 0 14 a 15 0 16 a 17 0 18 0.05 19 T 20 0 21 0.01 22 ",,,U.liC 23 0.01 24 a 25 0.04 26 0.15 27 0.04 28 a 29 0.22 30 0.15 31 0.05 TOTAL 1.40 Curry 1750 Sherman 700 Sherman 1900 4th of July 1600 GOld Creek 700 Devi I Canyon 1700 aaa o ooa o ooaao o o oao oo ooo o o ooo o 0.15o 0.15 See notes on Precipitation at end of tables for explanation of symbols. t 1 I )1 ]~-1 . J M14/66 2 TABLE 4.9 (b) MIDDLE SUSITNA RIVER PRECIPITATION DATA -(Inches) June 1984 Station Talkeetna Curry Elevation 345 500 Dax. 1 0 2 0 3 0 4 0 5 0 6 0.02 7 0.08 8 0 9 0.14 10 0.06 "0 12 0 13 0.08 14 0.02 15 0.04 16 0.64 17 0.03 18 0 19 0 20 0 21 0 22 0 23 0.01 24 0.03 25 0.03 26 0.07 27 0.21 28 0 29 0.01 30 T--TOTAL 1.47 Curry 1750 Sherman 700 Sherman 1900 1.00 0.50 1.65(e) 4th of July 1600 Go I d Creek 700 Devi I Canyon 1700 ooooo 0.09 0.02 0.10 0.06ooo 0.31 0.18 0.01 0.40ooo 0.02oo o 0.02o 0.08 0.21ooo 1.50 See notes on Precipitation at end of tables for explanation of symbols. tl I 1 .~-I 1 I 1 J M14/lJb 3 TABLE 4.9 (c) MIDDLE SUSITNA RIVER PRECIPITATION DATA -(Inches) July 1984 Station Ta I kee'tFla Curry Elevation ~45 500 D~ 1 0.30 2 0.02 3 0.01 4 0 5 0 6 0 7 0.01 8 T 9 0.10 10 0.11 11 0.01 12 0.06 13 0.11 14 0 15 T 16 T 17 0.02 18 0.13 19 0.06 20 0.52 21 0.13 22 0 23 T 24 0.18 25 0.61 26 0.59 27 0 28 0.01 29 0.08 30 0.16 31 T TOTAL 3.22 Curry 1750 Sherman 700 Sherman 1900 I 0.30 5.10 5.25(e) 4th of Ju Iy 1600 Gold Creek 700 Devi I Canyon 1700 0.08 0.04 0.01 0.01 0.06oo 0.04o 0.26o 0.03 0.02oooo 0.02 0.04 0.19 0.05 0.06oo 0.80 0.65 0.04 0.11 0.13 0.02o 2.66 See notes on Precipitation at end of tables for explanation of symbolS. M1Lj/~!4 'i 1 I },1 C\cl 1 -J ) TABLE 4.9 (d) MIDDLE SUSITNA RIVER PRECIPITATION DATA -(Inches) August 1984 Station Elevation Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28' 29 30 31 TOTAL Talkeetna 345 0.17 0.07 To 0.54o O."0.04 0.52 T oooooo 0.03/0 0.63/0.28 0.52/0.70 0.40/0.38 0.13/0.32 0.30/0.23 0.24/0.20 1.31/0.40 1.62/1.65 0.02/1.04o oooo 6.65 Curry 500 Sta rt 0.05o 0.59oo 0.63ooooo O.oo T 0.39 1.32 0.75 0.42 0.97 1.24 1.54 1.51o oooo 9.41 Curry Sherman 1750 700 Sta rt 0.27/0 0.49/0.46 0.46/0.35 1.83/1.16 1.19/1.51o/0.76 8.18 0 o ooo Sherman 1900 o /0o/0o/0 0.07/0 1.26/0.26 0.54/1.35 0.29/0.44 0.06/0.10 0.60/0.28 0.35/0.45 2.05/1.21 1.24/1.50 o /0.87 4th of Ju Iy 1600 Sta rt 6.65 Gold Creek 700 Sta rt 0.01 0.49 1.11 0.26 0.04 0.19 1.75 1.60 oo 0.01 ooo Devi I Canyon 1700 0.02/0 0.01/0.02 0.01/0.01o/0.01 0.41/0.10 0.02/0.33o 0.04/0 0.76/0.79oooooooo 1.03/0.10 0.33/1.02 0.01/0.24 0.02/0.02 1.00/0.07 0.48/0.95 1.42/1.33 0.70/0.83 0.01/0.39o oooo 6.28 See notes on Precipitation at end of tables for explanation of symbols. t M14/6t 5 .1 l 1 I I ~.~...J 1 1 1 Ji TABLE 4.9 (e) MIDDLE SUSITNA RIVER PRECIPITATION DATA -(Inches) September 1984 Station Talkeetna Curry Curry Sherman Sherman 4th of Ju Iy Gold Creek Devi I Canyon Elevation 345 500 1750 700 1900 1600 700 1700 D!VL- 1 0 0 -0 0 0 2 0 0 -0 0 0 3 0 0 -0 0 0 4 0 0 -0 0 0 5 0 0 -0 0 0 6 0.06/0 0 -0 0.09 0 7 0.02/0.08 0.07 -0.10/0.09 0.11 0.32/0.08 8 0 0 -0 /0.01 0 T /0.25 9 0 0 -0 0 0 10 0 0 -0 0 0 11 0 0.10 -0 0.13 0 12 0.08/0 0.15 -0.22/0.09 0.20 0.18 0.29 0.08/T 13 0.06/0.12 0.34 0.17/0.21 0.04 0.09/0.10 14 0 /0.02 0 0 /0.08 0 0 /0.06 15 0 0.02 0.02/0 f 0.06/0 16 0.02/0 0 0.11/0.02 0 /0.06 17 0.12/0.06 I 0.04/0.12 0.35/0.28 18 0.05/0.10 0.57/0.29 0.68 0.15/0.15 19 0.76/0.03 0.92 0.61/0.33 0.51 0.13/0.24 20 0.11/0.87 0.82 0.05/0.64 0 0 /0.01 21 0 I 0 0 0 22 0 I 1.95 0 I 0 0 23 0 0 0 0 24 T/O 0 0.15 0.05/0.04 25 0.17 /0.12 0.18 0.12/0.10 1.98 2.09 0 0 /0.01 26 0 /0.05 0 0 /0.02 0 -0 0 27 0 0 0 0 -0 0 28 0.02/0 0 0 0.01 -0.06 T/T 29 0.16/0.17 0.10 0.02/0.01 0.03 -0.09 0 30 0.10/0.11 0.21 0.05/0.06 -0.06 -0 0 1":'"73 ------- TOTAL 2.91 -2.08 2.28 2.27 2.15 1.28 See notes on Precipitation at end of tables for explanation of symbols. M14/6616 -1 J 1 --I 1 I -~i 1 1 1 .~ TABLE 4.9 (f) MIDDLE SUSITNA RIVER PRECIPITATION DATA -(Inches) October 1984 Station Ta I keetna Curry Curry Sherman Sherman 4th of July Gold Creek Devi I Canyon Elevation 345 500 1750 700 1900 1600 700 1700 Da':l.--- 1 0.02 0 0 0 -0 0 2 0.04 0 0.04 0.06 -0.04 0.02 3 0 0.06 0 0 -0.06 0.01 4 0 0 0 0 -0 5 0 0 0 0 -0 6 T -0.02 0.05 -0 7 T -0 0 -0 8 0.30 -0.22 0.12 -0.05 9 0.21 -0.04 0 -0.30 0.04 10 0 -0.38 0.01 0 --0.01 11 0.04 0.01 --0.01 12 0.16 0.08 -0.06 13 0 0 -0 14 0 -0 -0 15 0 0 -0 16 0 0 -0 17 0 0 -0 18 0 0 -0 19 0 0.02 -0 20 T 0 -0 21 0.48 0.09 -0 22 0.11 0.17 -0.03 23 0.24 0.15 -0.03 24 0 0 -0 25 0 0.01 -0 26 0 0 -0 27 0 0 -0 28 0 0 -0 29 0 0 -0 30 T 0 --0 31 0 0.62 0.88 0 0.45 0.64 -0--------TOTAL 1.60 -N/A 0.87 0.58 --"'"0:26 See notes on Precipitation at end of tables for explanation of symbols. "'"' R23/3 44 TABLE 4.9 (9) NOTES ON PRECIPITATION - ...... 1.Talkeetna FAA Station reports daily pJ~ecipitation from midnight to midnight for the days noted.Where a slash (/)appears,the first number is the reported precipitation and the second number is the precipitation from 9 a.m.of the previous day to 9 a.m.of the date noted. 2."Cu rry at 500"is monitored daily,with an attempt to measu re be- tween 8 a.m.and 10 a.m.each day. 3."Curry at 1750"and "4th of July Creek at 1600"are cumulative stations measu red at approximately 2 week intervals. - 4."Sherman at 700","Sherman at 1900"and "Devil Canyon"are continu- I ously recording stations.Where a slash (/)appears,the first num- ber is the precipitation from midnight to midnight and the second number is the precipitation from 9 a.m.of the previous day to 9 a.m. of the date noted. - T -Trace amounts of rainfall (e)-estimated value -No data M14/~}1 1 1 -J ----]---1 -~~l 0--1 I 1 J I l I ~ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL May Sta rt 0.03 0.06 0.09 **0.28 O.OO(e) 0.73 1.19M TABLE 4.10 EVAPORATION DATA,WATANA CAMP,1984 June July August 0.18 0.21 0.08(e) 0.19 0.07 0.02(e) 0.20 0.11 0.05(e) 0.12 *0.17(e) 0.22 0.40 0.15(e) 0.12 0.58 O.OO(e) *0.28 0.20(e) *0.17 0.19 *0.14 0.17 *0.06 0.00 0.37 0.11 0.55 0.06 0.18 *0.07 0.14 0.38 0.19 0.00 0.17 O.OO(e)0.09(e)0.14 *0.08(e)0.16 *O.Ol(e)0.13 0.42 o.OO(e)0.06 0.21 0.04(e)0.04 0.81 0.07(e)0.00 0.64 O.OO(e)0.05 0.28 O.OO(e)0.04 0.81 0.08 0.00 0.30 0.15 0.00 0.12 0.09 0.00 0.24 0.00 0.04 0.05 O.OO(e)0.23 0.03 O.Ol(e)0.14( 0.02 O.OO(e)0.03( 0.01 0.03(a)O.24( 0.06 0.12 5.66{e)3.16(e)3.55(e) September 0.10(i) 0.09 0.08(i) *0.21 0.06 0.02 0.06 0.12{i) 0.06(i) 0.04 0.08 0.02 0.08 0.12 end of data 1.14M NOTE:AI I values are for a 24-hour period ending at approximately 0800 on date shown. *No pan observation on this date.Amount included in fol lOWing measurement, time distribution unknown. (e)Precipitation data missing but estimated from observers notes and records from nearby stations. (i)Ice layer on water surface. M Monthly total is approximate,based on a partial record only. 1 ~1:1 --)-~l ~"l i .···l ~.1 J M15/12 TABLE 4.11 FALLING HEAD TEST RESULTS SLOUGH 9 -BOREHOLES Depth of Well 1.0.Screen Date Transm i ss iv i ty Boreho Ie 1ft)1ft)of Test Ft 2 /Day Comments 9-1 0.146 24-27 07 /17 /81~3.5 Good curve f t 9-1 0.146 24-27 07/31/84 5.4 Good curve f t,retest 9-1 0.146 24-27 08/15/84 3.4 Good curve f t,retest 9-1 0.063 9.4-10.7 08/15/84 0.2 Good curve fit 9-1 0.063 9.4-10.7 08/29/84 0.2 Good curve fit,retest 9-2 0.146 7-10 08/13/84 50 Sparse data,poor curve fit 9-2 0.146 7-10 08/15/84 92 Sparse data,poor curve fit,retest 9-2 0.146 7-10 08/29/84 12 Poor curve fit,retest 9-2 0.063 10.7-12.1 08/15/84 --No curve fit 9-2 0.063 10.7-12.1 08/25/64 2.6 Poo r cu rve fit,retest 9-3 0.146 37-40 07/31/84 3.4 Good curve fit 9-3 0.146 37-40 08/14/84 3.6 Ret.est 9-3 0.146 37-40 08/14/84 2.4 Retest after surging well.Value probably affected by previous testing. 9-4 0.063 11.7-13.1 08/13/84 --No useable data 9-4 0.063 11.7-13.1 08/13/84 --No useable data,retest R23/3 48 TABLE 5.1 MONTHLY PRECIPITATION AND PROBABILITY OF EXCEEDANCE TALKEETNA,ALASKA June -September,1981 ..1984 - -~ 1981 Precipitation-Inches Probability of Exceedance 1982 Precipitation-Inches Probability of Exceedance 1983 Precipitation -I nches Probability of Exceedance 1984 Precipitation-I nches Probability of Exceedance Mean -1943-1983 June 5.25 8% 4.20 16% 1.77 59% 1.47 70% 2.47 July 8.74 2% 5.74 11% 1.75 88% 3.22 48% 3.46 August 7.39 15% 4.55 42% 5.69 29% 6.65 20% 4.65 September 2.02 87% 7.54 11% 3.29 61% 1.73 93% 3.97 l'R2u/di 1 '1 )~--~i 1 I TABLE 5.2 1984 GEOGRAPHIC DISTRIBUTION OF PRECIPITATION MIDDLE SUSITNA RIVER Talkeetna Cll rry Curry Sherman Sherman 4th of July Gold Creek Dev i I Canyon Per i od 342..--.2Q!L 1750 700 1900 1600 700 1700 8/13 -8/U 5.17 8.14 8.18 -6.46 6.65 5.45 5.00 8/28 -9/12 0.16 0.32 0.32(e).032 0.20 0.18 0.63 0.40 9/13 -9/25 1.29 2.28 2.13(e)1.69 1.98 2.09 1.38 0.83 9/26 -10/10 Q..,J!2 0.38le)0.38 0.40 0.33 -Q....22 Q.....U TOTAL (8/13-10/10)7.47 11.12 11.01 8.97 8.01 6.36 Ml~/l}2 "1 1 J \I TABLE 5.3 MIDDLE SUSITNA RIVER MONTHLY PRECIPITATION TOTALS (Inches) ptShe rman)PCDevi I Canyon) Ta I keetna Sherman pIa I Reetna l Devi I Canyon PC Ta I keetna I 1982 May 15-31 0.47 0.29 0.62 0.33 0.70 June 4.20 3.98 0.95 3.35 0.80 July 5.74 6.37 1,17 4.19 0.73 August 4.55 3.70 0.81 1.38 0.30 September 7.54 9.14 1,21 6.17 0.82 1983 May 1-25 0.96 0.76 0.79 0.76 0.79 June 14-30 0.62 0.52 0.84 0.57 0.92 July 1.75 2.13 1,22 1,83 1,05 August 5.69 ----4.06 0.71 September 3.29 1984 June 1.40 ----1.50 1,07 July 3.06 ----2.69 0.88 August 6.63 ----6.28 0.95 Septembe r 1,73 2.07 1.20 1.28 0.74 ]M1?/J 3 ]J 1 I ]1 I ,}J TABLE 5.4 STORM -SPECIFIC PRECIPITATION TOTALS Devi I P(She rman)!P(Devi I Canyon)! Period of Rainfal I Event Canyon She rman Ta I keetna P(Ta I keetna )PC Ta I keetna ) July 1-12 1982 1.98 2.34 2.03 1.15 0.98 July 10-19 1982 1.46 1.30 1.36 0.96 1.07 July 21-25 1982 2.08 4.09 3.28 1.25 0.63 July 27-31 1982 0.60 1.28 1.02 1.25 0.59 August 7-11 1982 0.49 1.18 1.57 0.75 0.31 August 28-September 5 1982 0.88 3.32 3.32 0.97 0.27 September 6-23 1982 4.88 6.12 5.84 1.05 0.84 June 26-July 2 1983 0.72 0.65 0.34 1.91 2.12 July 4-9 1983 0.13 0.37 0.45 0.82 0.29 August 17-26 1984 5.00 6.40 5.20 1.23 0.96 TOTAL 18.22 27.05 24.41 AVERAGE 1.11 0.75 Site TABLE 5.5 PRECIPITATION COEFFICIENTS FOR TRANSFER OF RECORDED DATA Continuous Station Talkeetna Sherman Devi I Canyon Curry Slough SA Slough 9 (Sherman) Gold Creek 1.5 1.3 1.2 1.07 1.2 1.07 1.0 0.9 1.7 1.4 1.3 - To obtain precipitation estimate for above sites,multiply precipitation at the continuous station by the appropriate multiplier. 11 1 )1 ~-]""-~'~1 ~C-----l }I J J ) R2u/IV 2 TABLE 5.6 REGRESSION EQUATIONS FOR SLOUGH DISCHARGE YS.MAINSTEM DISCHARGE Slou9.h Peri od Regression Equation ~Po i nts Comments 8A July 3 -October 30,1984 Q8 =-.08 +.00017 QGC 0.53 115 Flow range (2,200- (excl.8/23-8/28)log Q8 =-5.0 +1.29 log QGC 0.79 115 27,900 cfs) Sept 1 -October 20,1984 Q8 =-.67 +.00025 QGC 0.73 61 Low runoff period. log Q8 =-7.13 +1.85 log QGC 0.91 61 (2,200-12,500 cfs) 9 Sept 8 -October 30,1984 Q9 =-.62 +.00039 QGC 0.82 56 Flow range (2,200- log Q9 =-4.1 +1.15 log QGC 0.84 56 11,400 cfs) 11 May 25 -October 22,1983 Q11 =1.52 +.000105 QGC 0.76 156 From 1983 slough report. June 1 -October 30,1984 Q11 =1.3 +.000072 QGC 0.68 153 Flow range (2,200- log Q11 =-1.5 +0.45 log QGC 0.76 153 40,600 cfs) May 25 -October 22,1983 Q11 =1.43 +.000087 QGC 0.63 309 &June 1 -October 30,1984 !M1~/l21Ll J 1 1 ]]-~']1 t TABLE 5.7 STORM RUNOFF ANALYSES SLOUGH 9 TRIBUTARY Slough 9 Tributary, Upper Site Slough 9,Tributary Lower Site Precipitation Period (1984) Runoff Pe r i ad Total Precipitation (Inches) Max.Daily Precipitation (Inches) Total Precipitation Volume (mi I lion cubic feet) Total Runoff Volume (mi I I ion cubic feet) Baseflow Volume (mi I I ion cubic feet) Storm Runoff Volume (mi I I ion cubic feet) %Runoff Groundwa te r Leve I , We I I 9-3 Maximum Dai Iy Flow Susitna River at Gold Creek 08/17-08/25 08/17-09/06 6.46 2.05 10.96 6.468 1.034 5.434 50% 09/15-09/20 09/15-09/28 1.40 0.61 2.37 1.081 ,0.798 0.283 12% 08/17-08/25 08/17-09/06 6.46 2.05 21.91 12.181 0.272 11.909 54% 606.8 31,700 09/15-09/20 09/15-09/28 1.40 0.61 4.75 0.149 0.073 0.076 1.6% 604.8 11,400 1 M1S/1}5 1 J J -~·l --]--~-_....I ~~~~l 1 1 1 J TABLE 5.8 1984 MONTHLY WATER BALANCES SLOUGHS 8A AND 11 June J.!!..!Y AUQust September October Slough 8A Flow,Q (cfs)2.98 9.19 1.70 0.63 (million cu.ft.)7.46 (3-31)24.62 4.41 1.69 Precipitation,P (i nches)5.46 8.16 2.52 0.78 (million cu.ft.)19.14 28.61 8.85 2.72 Evaporation,E (inches)2.02 2.49 0.80 0 (million cu.ft.)7.07 (3-31)8.72 2.80 0 (P-E)12.07 19.89 6.05 2.72 Q/(P-E)0.62 1.24(1)0.73 0.62 Slough 11 Flow,Q (cfs)3.17 2.82 2.75 2.44 1.45 (million cu.ft.)8.21 7.58 7.35 6.32 3.75 Prec ip i tat ion,P (inches)1.49 4.72 6.78 2.15 0.65 (mi II ion cu.ft.)3.93 18.55 26.60 8.44 2.56 Evaporation,E (inches)5.66 2.21 2.49 0.80 0 (million cu.ft.)22.14 8.68 9.76 3.13 0 (P-E)(million cu.ft )-18.21 9.87 16.84 5.31 2.56 Q/(P-E)-0.17 0.77_0.44 1.19 1.47 (1)Slough 8A I ikely overtopped in late August. M1?~lJ 7 ))J 1 )---I --1 1 j Table 5.9 1984 MONTHLY WATER BALANCE SLOUGH 9,TRIBUTARY 9B J!!..!.Y AUClust September October Slough 9 Tributary (Upper Site) Flow,Q (cfs)-2.62 0.91 (1)0.50 (mi II ion cu.ft.)-7.02 2.54 1.34 Precipitation,P (inches)-7.44 2.11 0.87 (mi II ion cu.ft.)-12.62 3.58 1.48 Evapo rat ion,E (inches)-2.49 0.80 (million cu.ft.)-4.21 1.35 0 P-E,Precipitation-Evaporation -8.41 2.19 1.48 Q/(P-E)-0.83 1.16 (1)0.91 Slough 9 Tributary (Lowe r Site) Flow,Q (cfs)1.21 4.97 0.30 0.07 (mi II ion cu.ft.)3.23 13.31 0.78 0.19 Prec i pi tat ion,P (inches)5.25 7.44 2.11 0.87 (mi II ion cu.ft.)17.81 25.24 7.16 2.95 Evaporation,E (inches)2.21 2.49 0.80 0 (mi II ion cu.ft.)7.50 8.43 2.71 0 - (P-E),Precipitation-Evaporation 10.31 16.81 4.45 2.95 Q/(P-E)0.31 0.79 0.18 0.06 (1)Affected by runoff from storm in late August. ]M1~/:J}3 1 I 1 1 1 I --i 1 3 Da i Iy Prec i p i tat i one 2) Date (inches) 1 2 3 0.4 4 5 .51 6 7 8 .55 9 10 11 12 13 14 15 16 17 0.7 18 1.35 19 .58 20 .31 21 .06 22 .64 23 .37 24 2.19 25 1.33 26 27 28 29 30 31 TABLE 5.10 ESTIMATED DAllY RUNOFF,SLOUGH 8A HIGH RAINFAll PATTERN(1) Estimated Estimated Estimated Wi th-Project Estimated Mea su red Groundwater Surface Groundwater Wi th-Project Flow(3)FIOW(4)Runoff FIOW(5)Slough FloW (cfs)(cfs)(cfs)(cfs)(cfs) 5.9 5.1 0.8 1.6 2.4 5.6 4.7 0.9 1.6 2.5 5.2 4.3 0.9 1.6 2.5 4.8 4.2 0.6 1.6 2.2 4.8 4.5 0.3 1.6 1.9 4.4 4.4 0 1.6 1.6 4.1 4.1 0 1.6 1.6 3.8 3.8 0 1.6 1.6 4.4 4.4 0 1.6 1.6 4.1 4.1 0 1.6 1.6 3.6 3.6 0 1.6 1.6 3.2 3.2 0 1.6 1.6 2.6 2.6 0 1.6 1.6 2.4 2.4 0 1.6 1.6 2.2 2.2 0 1.6 1.6 2.0 2.0 0 1.6 1.6 1.7 1.7 0 1.6 1.6 2.6 2.6 0 1.6 1.6 4.1 3.6 0.5 1.6 2.1 4.8 3.8 1.0 1.6 2.6 5.2 4.2 1.0 1.6 2.6 5.9 4.0 1.9 1.6 3.5 8.0 3.8 4.2 1.6 5.8 34 5.0 29 1.6 3.1 65 6.9 58 1.6 6.0 44 7.3 37 1.6 34 17 6.3 11 1.6 13 "4.7 6.3 1.6 7.9 8.0 3.7 4.3 1.6 5.9 5.9 3.3 2.6 1.6 4.2 4.8 2.7 2.1 1.6 3.7 ( 1 ) (2 ) ( 3 ) (4 ) (5 ) 20%exceedance probabi I ity August 1984 precipitation.Data are from Talkeetna through day 21,from Sherman after day 21. AI I data are adjusted to Slough 8A. August 1984 Q8 =-0.67 +0.00025 QGC Assumes flow at Gold Creek is 9,000 cfs 1 .I •Mll,1/~~4 1 1 J ))]-J Da i Iy Precipitation(2) Date Cinches) 1 .08 2 3 4 5 6 7 8 0.7 9 .39 10 .07 11 12 13 14 .39 15 .74 16 17 18 19 20 21 .04 22 .30 23 .13 24 25 26 27 28 .21 29 1.46 30 .42 TABLE 5.11 ESTIMATED DAILY RUNOFF,SLOUGH 8A MODERATE RAINFALL PATTERN(l) Estimated Estimated Estimated Wi th-Project Estimated Measured Groundwa te r Surface Groundwater With-Project Flow(3)Flow(4)Runoff Flow(5)Slough Flow Ccfs)CCfs)Ccfs)Ccfs)Ccfs) 7.7 5.7 2.0 1.6 3.6 20.8 5.7 15.1 1.6 16.7 17.0 5.2 11.8 1.6 13.4 15.3 4.6 10.7 1.6 12.3 11.6 3.9 7.7 1.6 9.3 9.3 3.3 6.0 1.6 9.6 7.7 3.0 4.7 1.6 6.3 6.4 2.8 3.6 1.6 5.2 6.0 2.6 3.4 1.6 5.0 5.3 2.5 2.8 1.6 4.4 4.6 2.4 2.2 1.6 3.8 4.0 2.2 1.8 1.6 3.4 3.3 2.1 1.2 1.6 2.8 3.3 2.0 1.3 1.6 2.9 3.0 2.0 1.0 1.6 2.6 2.8 2.0 0.8 1.6 2.4 2.4 1.8 0.6 1.6 2.2 2.2 1.7 0.5 1.6 2.1 2.1 1.6 0.5 1.6 2.1 2.2 1.7 0.5 1.6 2.1 2.8 2.0 0.8 1.6 2.4 3.8 2.7 1.1 1.6 2.7 3.5 3.5 0 1.6 1.6 2.1 2.1 0 1.6 1.6 1.6 1.6 0 1.6 1.6 1.5 1.5 0 1.6 1.6 3.8 1.7 2.1 1.6 3.7 19.8 1.6 18.2 1.6 19.8 25.3 1.7 23.6 1.6 25.2 19.8 2.2 17.6 1.6 19.2 (1)61%exceedance probabi I ity. (2)September 1983 Talkeetna precipitation adjusted to Slough 8A. (3)September 1983 (4)Q8 ~-0.67 +0.00025 QGC (5)Assumes flow at Gold Creek is 9,000 cfs. 1M19/55 5 1 ]1 ]I 1 --1 Da i Iy Precipitation(2) Date {inches} 1 2 3 5 6 7 .11 8 9 10 11 12 .24 13 .18 14 15 .02 16 .12 17 .04 18 .61 19 .65 20 .05 21 .22 23 24 25 .13 26 27 28 29 .02 30 .05 TABLE 5.12 ESTIMATED DAILY RUNOFF,SLOUGH 8A LOW RAINFALL PATTERN(l) Estimated Estimated Estimated Wi th-Project Estimated Measured Groundwater Surface Groundwater With-Project Flow(3)Flow(4)Runoff Flow(5)Slough FloW (cfs)(cfs){cfs}(cfs)(cfs) 4.1 2.5 1.6 1.6 3.2 3.2 2.3 0.9 1.6 2.5 2.6 2.1 0.5 1.6 2.1 2.0 1.9 0.1 1.6 1.7 1.7 1.7 0 1.6 1.6 1.5 1.5 0 1.6 1.6 1.4 1.4 0 1.6 1.6 1.2 1.2 0 1.6 1.6 1.2 1.2 0 1.6 1.6 1.0 1.0 0 1.6 1.6 1.0 1.0 0 1.6 1.6 1.0 1.0 0 1.6 1.6 0.9 0.9 0 1.6 1.6 0.8 0.8 0 1.6 1.6 0.9 0.9 0 1.6 1.6 0.9 0.9 0 1.6 1.6 1.2 1.2 0 1.6 1.6 1.7 1.7 0 1.6 1.6 2.2 1.9 0.3 1.6 1.9 2.2 2.2 0 1.6 1.6 2.2 1.9 0.3 1.6 1.9 2.2 1.6 0.6 1.6 2.1 2.0 1.4 0.6 1.6 2.2 2.0 1.3 0.7 1.6 2.3 1.7 1.2 0.5 1.6 2.1 1.5 1.2 0.3 1.6 1.9 1.5 1.1 0.4 1.6 2.0 1.4 1.1 0.3 1.6 1.9 1.4 1.2 0.2 1.6 1.8 (1)93%exceedance probabil ity (2)September 1984 Sherman precipitation,adjusted to Slough 8A (3)September 1984 (4)Q8 =-0.67 +0.00025 QGC (5)Assumes flow at Gold Creek is 9,000 cfs ---1 M19 ;;;'1 6 1 1 J J 1 -]]~ TABLE 5.13 ESTIMATED DAILY RUNOFF,SLOUGH 9 MODERATE RAINFALL PATTERN(l) Estimated Estimated Estimated Wi th-Project Estimated Da i Iy Mea su red Groundwa te r Surface Groundwa te r Wi th-Project Precipitation(2)Flow(3)Flow(4)Runoff Flow(5)Slough Flow Date (inches)(cfs)(cfs)(cfs)(cfs)_____L<:;fs) 1 .07 2 3 4 5 6 8.3 5.6 2.7 2.9 5.6 7 7.8 5.2 2.6 2.9 5.5 8 7.1 4.7 2.4 3.9 5.3 9 .65 6.8 4.5 2.3 2.9 5.2 10 .36 6.4 4.3 2.1 2.9 5.0 11 .06 6.1 4.1 2.0 2.9 4.9 12 5.7 3.9 1.8 2.9 4.7 13 5.5 3.7 1.8 2.9 4.7 14 .36 5.3 3.6 1.7 2.9 4.6 15 .68 5.5 3.5 2.0 2.9 4.9 16 5.3 3.5 1.8 2.9 4.7 17 5.3 3.3 2.0 2.9 4.9 18 5.1 3.0 1.9 2.9 4.8 19 5.1 2.9 2.2 2.9 5.1 20 5.5 3.0 2.5 2.9 5.4 21 .04 5.7 3.5 2.2 2.9 5L-1 22 .28 6.1 4.7 1.4 2.9 4.3 23 .12 6.6 6.2 0.4 2.9 3.3 24 7.3 5.3 2.0 2.9 4.4 25 6.1 4.1 2.0 2.9 4.9 26 5.9 3.5 2.1 2.9 5.3 27 5.7 3.1 2.6 2.9 5.5 28 .19 5.7 2.9 2.8 2.9 5.7 29 1.35 8.1 3.0 5.1 2.9 8.0 30 .39 14.2 3.9 10.3 2.9 13.2 (1)61%exceedance probabi I ity -(2)September 1983 Talkeetna precipitation,adjusted to Slough 9 (3)September 1983 (4)Q8 =-0.67 +0.00025 QGC (5)Assumes flow at Gold Creek is 9,000 cfs ··1 M1':t/??7 1 )I I 1 I J ] TABLE 5.14 ESTIMATED DAILY RUNOFF,SLOUGH 9 LOW RAINFALL PATTERN(1) Estimated Estimated Estimated Wi th-Project Estimated Oa i Iy Mea su red Groundwa te r Surface Groundwa te r Wi th-Project Prec i p i tat i on(2)Flow(3)Flow(4)Runoff Flow(5)Slough Flow Date (inches)(cfs)(cfs)(efs)(cf:;;)(cfs) 1 2 3 "3.7 7.3 2.9 10.2 4 9.5 3.6 5.9 2.9 8.8 5 7.1 3.4 3.7 2.9 6.6 6 5.6 3.4 2.2 2.9 5.1 7 .10 4.8 3.5 1.3 2.9 4.2 8 4.2 3.6 0.6 2.9 3.5 9 3.6 3.5 0.1 2.9 3.0 10 3.2 3.2 0 2.9 2.9 "3.8 3.0 0 /2.9 2.9 12 .22 2.4 2.9 0 2.9 2.9 13 .17 2.4 2.9 0 2.9 2.9 14 2.1 2.8 0 2.9 2;9 15 .02 2.1 2.7 0 2.9 2.9 16 .11 2.1 2.6 0 2.9 2.9 17 .04 2.1 25 0 2.9 2.9 18 .57 2.7 2.6 0.1 2.9 3.0 19 .61 3.2 3.0 0.2 2.9 3.1 20 .05 3.6 3.4 0.2 2.9 3.1 21 4.2 3.8 0.4 2.9 3.3 22 3.6 3.4 0.2 2.9 3.1 23 3.2 2.9 0.3 2.9 3.2 24 2.8 2.6 0.2 2.9 3.i 25 .12 3.3 2.5 0.8 2.9 3.7 26 3.3 2.4 0.9 2.9 3.8 27 2.8 2.3 0.5 2.9 3.4 28 2.4 2.2 0.2 2.9 3.1 29 .02 2.4 2.2 0.2 2.9 3.1 30 0.5 2.1 2.3 0 2.9 2.9 (1)93%exceedance probabil ity (2)September 1984 Sherman precipitation (3)September 1984 (4)Q8 =-0.67 +0.00025 QGC (5)Assumes flow at Gold Creek is 9,000 cfs """, F" ! F"" i, R23/3 49 FIGURES HILES (APPROX.SCALE) Q .. '113,..-'••••• SOURCE:MODIFIED FROM ADF&G 1982. o I 10 1 1.LOCATIONS OF PRINCIPAL SLOUGH STUDY SITES,1982-1983. PREPARED BY; ~~======== !=I&M CONSULTANTS,INC. Figure 3.1 PREPARED FOR: I}{]&OO~&C~®&®©@ SUSlTNA JOINT VENTURE j)I 1 J 1 1 ]1 I J )t 1 6 SEEPAGE METER Q STREAM GAUGE /"TRI BUTARY STREAM ,';,';;;',;.;'.':.;'.;c,;.;'.',,.,.,"",;0;'.;;~,;..:i i.,:",.'\,. .""\k(;"";;'t;;.t;;Ni,(;.~.,.;;·'·.ii-".',:".....,.~;;"...".r.'.".i':i.,.,,~,.". ~ t I ICALEI":1000' .....;.::., X RM·127 PREPARED BY;, ~~~.~='==~=='='====== R &M CONSULTANTS,INC. .NQIN••,.B UIIQLt)QI8'T8;t:lVDnOLCUI18Ta .un~"VOA. !.1 Figure 3.2 SLOUGH SA PREPARED·FOR: G{]Li\OO~&c mOOLi\®©@ SUSITNA JOINT VENTURE I 1 i 1 -J '1 t·J t,J i 1 x· RM 130 .~.~. .....~..,<. .;.::;i:;::\. ...<\~:. ."::":. ""'to "'::'..}.. ....~:\~ .._..:~:~~!.. ...~. •BOREHOLE b.SEEPAGE METER Q STREAM GAUGE IV TRIBUTARY STREAM e3 &Q'~ ~c:D<t::7 ( I ) I SCALE I":1000' PREPARED BY: ~ R&M CONSULTANTS.INC. .NQIN ••AB DUOL.c;)QISTII HVCADLC[JIBTa BUA'!"_VDA8 Figure 3.3 .SLOUGH 9 PREPARED FOR; [}{]&OO~&c @:[ID&®©@ SUSITNA JOINT VENTURE 1 ]i 1 I -)1;• I I ~ sus/rNA R /V ~R $1311 SLOUGH II o 1000,, fEET CapPRQJI:.ICAU I f).SEEPAGE METER Q STREAM GAGE SOURCE:MODIFIED FROM ADF &G (l982).• PREPARED BY: ~~.'rl__~" R&M CONSULTANTS,INC. .NOINIIBR.aUOLDDIB.TII ttVQRDLDOIBT••UAV.VDA. 1,/' FIGURE 3.4 SLOUGH 11 PREPARED FOR: [}{]&OOcg&c ~IID&®©@ SUSITNA JOINT VENTURE 1 1 .1 I 1 J ~l '-1 '1 1 ~I 1 J J I 'I ~I 808 --l-'.+----+-.-.--:-1____"._.__1..---:_._.",_,_ 80a·t··.'~.."'1 .:..j.'i fiji ii '-;:111"iii .1 \:1:i 'II!i til fI']I "w'l I I ,i , .;T;lTTiilTllifT TTTT1Tirmr.r1t r l nrr II TIl'j-1itr I'...rrriTr-~I I ;:1:i\'~'-~-~ ..,.,I j".j j .',I ... \j I I 1 ,I """1 :.~....,......•-I :~TTII,··T..1\""1.'r.-1-'-H.""r'-'-ITT t--1i'·'·i··T~I ..J '·"I'-r·.r!'··1.1"·-t-t·-·f·fl.j+ ,,.!,..':,!:I 'I ii'i II .........\.[1+1 !r I I I I I r f ['j I'I 1 .'I 1 !I 1 I !)j'..i 'i,I'...I ..1·1 ii,I I I '1'-....- ...............I "j i'l j!~!-l_L_L--h-:-;~I-l-~:1 ,uillll Iii I Iii iLLu Iii -...--.II II!.,.1'I c ••'I •••0 -Stage,wen 9-1A(feet.IJS1)III .11-II I\lii:I !,-.,:J:Lf~'...•1 ~~~~~;~~~l~:e~:~~)GO~creek (cfs)Jill 11 r .rl',t 'IT nil t', I -.et.;."".11 .,!I.I II··I'----~~""j"lJ'I··'···,."!.d "104 ,....I W "'1Il"~l...!,i r - - --1-i- ...".., : .I ..:"".':I -"I I I 1 ;"'"1'-:·.':'1 1 -.....:,'--i I~~~J.-....-L I I 14 ..l.Ll.~_.lL:_L _+_+__1 I I 1-i-Illl_e.-t.~__I'_Ii -,j j I I ..;- .:"•1 1i ~·:i '·i ·!li:!-···I-·..,-+---1 ·1-I'Ii ,--.--'-.'1'"-·l·t-).'t-T --"1,.+1~.·i i·::.:11.ii',:.;;;J l'l-I .-I ..----t--r''1 .1 '1 -----....----.'-----...~...'.--j----t'.H -i ,,,'.'1 "j .,..I I I I I ...,--..,.I I'-'-f······-.......I "'j-l-11 ::I.i ::I.II.+H--fl·Ii I."1.1+.-.I ....--.....'1'"··-t·_··!·,,i,;I ;I'I i j I r I I ~'I~TT '.I I ',.'!i ,'1··jc··ni'I--··"1"- --.,..-'--r--'--'-1 L_.:j.......-.j I ..I' I "'I , "'I!'"j I j• ,,'T 1 "t··I'j""1.1 ..1-'-.'.-.-Ii I;I ,I :!,'1'I I \r r I .I ,Ir '!'1'I'..r'.I -..'i '."..·"1 '1 i804"__-+':I,I 1 1 ,I I I r ...''1 .i "+1 I I.,:I i I ;.I [::r-l'i I j Ii j j j --.'--,..""I'~b,b.·.W.EiAIT1H~.F·~IFf~prrsl·..-I'..fj".'..!'1111'1 II 'II II j ,..--I·..··1··1 .,(..r:liI"R'1IU.I:'."..:.I,,,;"..j -"1I.i;I I!I;j I I --.....J .t:l1 SI'u"Y'I""",r.l1l".,N,-.j.-..-...+':.,!i!,I !iii i I ;Tt I ,j I ..I·I'II i I II'"'--1 ..-1\-..I .-...t--I I r-r-.:;--c-.--------r--t -t-:~T l-n1--ir,I I't-TfT..;"T I I I.;zI':.1\II.;ji ",."'..'r-,.,.I I t,,I 'I .'.'"1 I:I..',:I """il 'I l'~',"11 -'.,',"".--..,:j i j 'C1 ,.--.....,r''--t····l'..··...,.,-I·'1'I.'f'--'--';'III 1'1 I I i j I ._I ~I ~ . ,'I !I 'I "!II.I..I j 1 Il'--1-'--.I..--'...'-"'1',--I'"'1".--...".--··i :b!t""'f'.--....----'1'1 [.803 !;,.":!,!:'f I '.~-r .......f\".'11-". ,I.Iii.:.1 i j 1'1!II Ii"I':i ../1 j ---.......r !...-.IV'~I LI ..~.---.-,j H-l.lI,,.,I I I ·1··...·1·.·1-"....I·------I I ,.--..--'-1-.-I '-. ."I !',I.'~:.~.j '..'.'II ~I.i.·'-..-..~I·"r I·f-~~.....II)~'.I '.-~."['.JillCD,,~.0 "•.iii cO '!11'CD 1IO I I ..&O~)I ....~'..-r'----r--....---~..+t-t++---li...Lte ·.-i "!Ii Z!ii --I--ir ..~,.'--fDo·I I I ..I I ii'I :1 .I'0 -fJ1·ell··I·to -I ..GI·.!;;'.I ,.I'1 ,~.,,0..I I'0 I,......1 ........til ..t .til tII.-i o i i:>.1!i I 'I!>:Ii!I i..>!1·I ~.I ~j (1 I :;a I ,.~......r..t·1 ~r 1 I ~.I ...----..j.I S802]1..1 ...0 ,.I I ..1..0 "'.',.0_.•I'"QI ,.I o.l .~~J._-~LL~.t L.•L qJ~t:I 0 ,~~------~ PR~PAR,gD~Y:.__., ~. R&M CONSULTANTS,INC. aND_N••Aa DBDLDG&8T.""VORO"cOIBTa .UR~.YQI!I". SLOUGH 9 -Groundwater observation wells Stage Comparison Figure 4.I (0) _......_...-_.--~.-------~.~------------_.__.- PREPARED FOR: [}{]&OO~&c~[ID&®©@ SUSITNA JOINT VENTURE 1 •..~1 1 1 1 J ...I J I i I I 608 1 1 'r LiU.-t1 lltmm'~'I I til ~~~++UW+W-11~~W=W-ti I"W1 I I J 'I'".,.,1 I'.,'I I·I 1 "',I I··'!".---~++--r"--..-----.....__.-r--i-'-;--lii·',+t-i--+--j -- ---.--."~T'T -~-t-'rr -.'.~:..'. '"j I "I I I " "I I I I',I I!111 (j t Il.'",I:I!: "i i:0 -Stage Well 9-lA(feet IDSl)I II I I I ,.,:I,I ."I I 'I I.'" . ,,0 -Stage,Well 9-3 (feet,msl).!1 'I ' 1 I·:t ...:";"'-~'i'..'T+T-;-!~.!,:--Streamflow,SusitnaR.at Gold Creek (cfs)'j -/"I fl"Tr- j -j.-'--11'-\'1 -ir,-T.-l , I ~r~-r -,1 T,I I I I I II I , 607.I ,',',[:I !I I'1 'II I'I '.1 ,:I I;:+---.-t~-:.,-Tii-··!-·..l-,'Trl-..T·!...·-H.---~H.·l /I t.~'_.~.--++.-r-'rc'r--"'1 "l·tt.'.' !,Ii 'II I I Ij I I I'.:i I !.."'::.':.I , ,I III''':',1,,-;.11 I +11/J ..·1·~-......-.."j "I-T'j--'..-.--T_•••'.'.[+I..I··"If·.·I··,___,,-I .I I -I I....,, ...,,:•I ,,:.,.."I"I 'I !"'I ,1:1.I~'I . ,,:I:".Ii'I'I l'i .:,...•I "'i".,.,I l ........I"j......1"',..,.'.I 1'".,'.. !!.I ~,I::!!'i I I .!!II''!I··:','I I :''I'i .1'11'I .L ...............":J.~.I ii'; ;I i [i._.L1JJ...11~-f-1 r .,"'.I e-e--..---...1-ill'---·\Hl·f· ,i:'i"'II'1ft 1' •'1 I·, ,".,i :I·_....--..--r'..; ;,'.I'.'.'.:.I'.!:.I.I I'I 1..I.I I'......,...[.....,.''..:,: :iI',"I I ','I I f I 'I I '."I;:1 I I ':'.I'".........-.-.'1'j .,.I'.'"I "I605'.:",.:!:[::'!I'"I·--_._~----:-..._--,-.._-~---'-_..._-._.,._._+---' , , I "i ii,I :.:II I.I'...1'."···.1 ,·1 III I'li 111 Ii I j ' ,--....--.'1'··'--·i.··J.l.l ~':.-:.-=-.:..~~-l_'_I "I Lu'-,......'..--..._...-.-. ,"I ,,'I I I I::'II II!!I Il !]111 i :.'1'1 Ii ftr'jll j-.'~t ~'':~.'..,.....--....·..••·...~:....rt T ''r -j·-~;Ifrjf-I 604 Ii:II !' ,1 I ~,1 I I ,:I II!I f I II!-I'1 -II 'j ,.,I Ii j j Ill!.\I 'II .'r "1 1 ',.,..,...--'"I .....·tlr- ,I!I ~I I 1.'1,II ~II'''-'.--"",-j'-.,.---;-+-'-1+,..I-....1 ' 'ri.JlTI'il:!IIi!illl Ill).:'_--j 1 1 111 , I I ",'I'I I.II [I 603:II I ,II!1,1,I ,:! j II:I I I :I 1 II IIII I"If.'1 I._......_...-.....~'j r •I I I I I "...!!'I '•I I !!.~,·~~•'~I I ~10··,.''10'",,1'10,,1 .,.-10 ...10 .I cD I 10 .........'i '."i....1 I ,.,:'.I!!I :I -.,.,.10 ~.....I ,!:':-~e1Tm !iiJ1Jm iITl llJrl I Ii i 11 iL -i _r 1111 UJrnJ Till PRe;f'~~~D~_.=JI::..5:Y=:'==~===== ~' R &M CONSULTANTS.INC. IiNaIH••A.OI!OLOGI8't.HYDRDLDOIBT..URV.VDRII 1 ;1 SLOUGH 9 -Groundwater observation wells Stage Comparison Figure 4.1 (b) PREPARED FOR: [M)&OO~Li\c §[IDLi\®©@ SUSITNA JOINT VENTURE 1 I ]1 \)1 1 t I ........1 :.... SUSITNA JOINT VENTURE PREPARED FOR: [}{]&OO~&c§[ID&®©@SLOUGH9 -G,'oundwater observation wells Stage Comparison Figure 4,1 (c)--"-_.._-_._.- PREPARED BY;~;:c.:.......::::.:,=---"::;':;;--'''::';''--;:.:.;:'==="'='-=.- R &M CONSULTANTS,INC. .NCiIN.IIRB DEDLDSlaTB HvDAOLDalDT8 .UAY_VDRB -I )I 1 1 I "~-1 1 ·-1 i e08- ---'--:--:--1 ;~--~Tl--:-r:i '1--'-r7""TTI''--,'T-.;+,."I'"..I·'I I': ';I '':;;Ii;:~;I,I :I j ; ,_.-f----'-"•.,,._-.--,·-_·_·t·_~· , 606.......----+..---. 607 ",.11 '.---Ti.·l -r,."•.,....-.-str..eamf..10.W'.susitna R.at Gold Creek (cfs)..ll-'i'i.L.,t-n:.l-·--i , , " I ' I I I'1 [I" - ,I::1;i lltrt M'--llt,;'--ltl'···l't'l+'I I II:In''i 'TT It I'll!I II .I'!II i:;I,I I !I 1 I I I .I !'i .;t I,t~j T f !llttt-r I I Trwt I ' "'', ;I II : ,!II1I1I11111 !1III111I ------,,.."-,-...-..._~----.--I':,-~-;Trr nIT:'n-n-r rrt tttt fi-t til!--'..'...']1 :r'-ttl -"r·[']'1.."·rl.H-l-fi',l.Tl-f---'jl,.I,.I.···r ,I -1 'I 14 rn'·~I I II 1 I I I L'I -.-"'1"'!....I·_..",.J I I I I I 'I I -!.I I I j I,:'I,I I -I '.....--.--.'...i········..·"'1'"l',I---J.J.:_~..-J--l .....-W ...-..:...,..-+~..L -r----,I +-I U·N-+-----to.---+---I --.f -t.t-11'J'1 '.'.''.·m. l..'...._~-;',I I I 1·1·I I I ._.. --I-._.-.'...-j'-'-'+-_..."'j t ··1 --'"i ;I',-!1 I -I I .:.:.'111 _.-'l:'j j r '~~~l~~"":'i..i .;il Iii .~--l._il _+++'r I j I I ill 1 _-,.I 111,!;:Ii:1 ..\::..:1- ,I'""I I !!t-., ,-I I -_....... -;'.:.",, I j I.1:fl It f t'-1---.'-....-I~1···1·....\I\j ---j ...-....'~~'-I--I, , - I 1"I ','I I I -I -..-....-- .I···...."1 "J .--.--··1 I ",,IIt',:I'---,".!..oo..,.-'-J .i....---..-I "j_.II "ri"'1 'i-:~"'i...";"';""."~.-..'--_.~--::I Ti-',.-'\...-!,..It-,'~1+-1t '--'l 11 .1'11' -;,,';. . -i I I I ,j ..".,..N b1\1\I ...1 II I 0'.i'1.'"i I':.I'::j"1 I I !I jill I II I I I I I ~I AIVAJI ABll,'I I'..II i rJi i _._4:-I --L.-'II !:1 .I I I ..1.t'I'l?pf-\6~J_1'1 ..I L i '.-:.'j :.::.:i'.-.'1.'.'i jjl.1 I j . ........'...'1 -ll·.11 ........:::J -.1l,I 1'1 .I l'1 ,.,.t I i U".. ._.--_.[....l.If ....I -I- I '.I I ,I ''i,,'Ii I!1 •'-".........1-...--....j., r 1 'I I ,I I':'-I --....-"-'--I I I i I +1--'-~~-T~-~-~,G-f:.1 L ..-..-.....-.._.........I ..I··----..._..-,.I Jj :iii !':' "I j i I;I."..j "j'".----··1·-.-I····--...T I '-j ,i .1 I '::iii I !l';····1 j ....I --.-....---..'_..'-.I - . .......',...'1 603;..- , - -!:I[-f I I_II t r I I ..I,-.'-.......j I .·1··Illi I 'Iii II '.'1'I .~1 I.'j I'i I J 1--,I -....---I·.1 I -if I··.-....f.+Ii..I I 'I·I I I 'I ...I t i _....--_.".--..-'f '--·l··J ail '1 , .'4'i I I;i '4'Ij I I I ..'.-..-..lllr ......--'Ii I ~--f"'....-'11 .'jJ. :;::'Ii .~.,10:,:,Ii lIll lIll 110 I~~10 /O,eoI'4"-'-.'.~-tt ---r-+--~..-~-. .-~....1---.dr-..~..--~~..ja..f---T-H ---~I---y-:;::' .....'I,I ',I I 0 I I I r~,I ;;...N ...j..1 N I 'I 0'tf~i;i ;~:\:I I '.1)I I II ,I ~·.r.::t f1 ~I -..-m''·l--'··I~""r ..·1 ···.·.f III ...o -'- .~-- ,~"I I 'If I I I 'If I···J''If 'If ...;···..,1 I ,10 602 -0:,,0',1 Ii 0 ,0.9 9...I'....,q_L ,0 aNOIN.IIRa DBCLCOIIt'T.HVDACLDQIBTIIII .UA~.VOIlll" PREPARED BY:PREPARED FOR: ~Jf01 ..'.._-:-.n __~..~---.._--.SLOUGH 9 -Groundwater observation wells [}:{]~OO~&c[glID&®©@ R&M CONSULTANTS,INC..Stage Comparison Figure 4.1 (d)SUSITNAJOINTVENTURE 1 1 ')i "j---I ~-l -1 1 SUSITNA JOINT VENTURE ._---1·-I-j-ll -I TR~+1 -'1 F;II-----l-.:t-lt.-·t I f--1--11 1 1_1 I ...',: ..'''.-~~.'i .,1 ~--1"1'1 '1\f l 'll II'.:I I'I....-'I-t+-<1+JlH'I\!..,l---"tI )1"+r ..-tj-t,:--1-;. ..'1 I I'"1 I ["'1 I I I !1 I 'I,I ····I~l!j I ltt'I'I l'I I 1'-f'.."'"....'~I I ..~..~III 607 '.-1-I ,1_·j-t....J'·····_....i~.[.+.··~I'·--.,.'•~'.i-t-"T-.·r'-~,.1'--_..".:.,' 1 I I ,'I 'I'".,.,I 'I I···....-...'I"i:.Iii I I , I I :I 'I'I 'i ' "i I I II "l I 'I'II i I !!I I i II I I : I ".,I !!I I I ":' I.-I 1 1 I-U1_",-11..··.t~-1--1 J-.I..+,.r.t·.·+~u-~.-!'.;.' ·-·,"1".-!-I'1: 1 Ii)IPI 1 ...I ..11i II i II!"II.II'j i i .,.....I I 'I'I ."~O~c.j~J_--I _.:.:...--i +-.J'+-If L:!;;j~th'T~U,,T-~ I I~rrb·"·:,-.;.'.•,.j".,'.-'.',i1i+~{i+(it1 !111m-Hl Hii -I r 'JI.I._ 11!t.:......:.ci..!;.!.I-l~II+]['.:1,]-.1,'.1,.' .•..'i;':"1-1 ]*llw I 'I'II I IT 1 1···············1 II'..lll j;, 605.Ii",If:!.I I .....":I I W I ,j I I l,j !1 I 't --..,r'I '.'fl D;,.OOO.'~':;'-'"....I -~.,'-;"-r~T-I'--t T 1-rI I -y'T1 -Till ~1--r-I i"I I,..j I j i I FT , I I'-/!,'~i····-."j'"I 1 1 ,,.",'i ' ,,i I [I"-..11 1 ,.,i'! ,I''i i :I I'I I,,I I [y ,1 1 !:-.,..I _.-(,.,;I:O;OO( ...;,I ,II I'I l'I I 'I ...t!.+.1 I~"r"I"":':i ,.,;i ::!!I i I ~-'I ~..rl I I I Ii,I I I .I I I i I !Iii -"04 .•~.j,:'.~..~I.1_..'..Li-l j I '"iii J i I I II I I I I I i_e--I I \ I I I I ".2 >,OO? 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R&M C'ONS,ULTANTSJ INC. aNDIN••Aa DB~LI)-GI~T.HYDRDLOalBTe eUAV.VORe- ,, SLOUGH 9 -Groundwater observation wells Stage Comparison Figure 4.1 (h) --._._--~- PREPARED FOR: [MJ&OO~&o~[ID&®©@ SUSITNA JOINT VENTURE 01 I 1 -J 01 1 0001 00 0--1 i -}1 Boa.00...0_.._+0_. &07 &0& 0__'.,.0_'···--···r······'··r'-t..1 t I·; o....1-;..... .NQINlisR.DSOLOGI8T.HYDROLDGIST••UA".VClR.SUSlTNA JOINT VENTURE 1 I )c-J 1 1 ),.-)1 J -,--I i eoa J'I I 1 j ,w=i,Ii'I '1 'I I ilL j ,I I I I !1 i I I I I I H·I·-1·j I .r I 1 I [It I 'i IT i II ill',-.----~--'----"-.;._-,,---;-------;--T---------rtTi r·'H-+-t++-H+-\-t-~-+-H-+-i-,,-+-+n-++-'H·+-h-++-+++-L--H++-h·,-I-,t-u'-~!-rt-f :-;, ,,I :I ''III I I II i;II 'I 'I __,..__~,.',,I.~,g=~~:~::~:ii §=~~~::~::i~.Lj!J __1_.,\j 1.J J _!ll..! ...-Streamflow,Susitna R.at Gold Creek (cfs),I,i :i Hi!11 r !r t ,I :I I I I I I i I I i ,'I,'--r #i ,I',",'1 'I I:I,i I I 'Ii [[I607I',I ,I I I I I I'I I I I'I,j I I I'I ':,I I '1 , ----..1.1 .L,riri i "I 1~11l++-t+l+'~Tt+-j--t'(Tt---rr+rLi 'W Tn; I 'I I 1 II,I !i I II I1 1 I j 1 I1 1 f I:I!!'I,I,!I'I ",,I , : I ;'1 ''I I I "I I Ii'I I I I I i I.....I ,:I !I II thI I --11 -'t"1 III 1 -11'I I r .-+--I;I!: .I r i 1 -[!T~", " " "I I I , I "I,, ,"I I~o~J ,__,-1,_._.1...__.__'...."__'..,_,_,.;.l~_~l ~-~,-L'T1.U I ..l..-t~-__11,1-.ill /~Jll 'fi.j-.L~_..L!~..Jr!!J_~'~U !'I '• ,1,1"11 I H,!,i i'!,j 1:1 I 1,1 filii 'Itl~,:!'I ",I I I I ,ii':'I;I I Ii'I I,' ._,.,'..1:.'~--.'.r~r:lU i IW ~IILUI-1[1--~J J f ltj 11-~·11"...-...,.-t'~n-I f'l-'r-l-~+i-ti 'I -h, ,:!'i j I'I I I I I I I I I I , '"I 'I t I,Ii,t,,,' "' I i 11I --I I 1J1!I 'I I -'t'll 7 I III" , ':,I::;I I --I I'I I 1 I --I I I -1 :t' ,'1 I 1 1 I I I',I I! , ' 'I;i ::I 11 I I I-~j~-I"·.'•~:;:ttr 1 HI .II T~~ltf -I 811 "hit-r I j I t~LI'I 604 :'.i:i.U I!',i !J i!II,I I,I I " _I JI:Jill IJ I l.,;e,."'I ,i l'"i ,~UI ,I!i I , , ' : I Aft ,~;:!I I~'I r I ,i IT ...~.'"";I '.1.I i1 I I'~'!...-..--...."n..1 t.!il In'''llt l.iTT : 1 I '~'t.....I\'--:I':!I!I I I I '."'.'"1 ~[I i I --."1 'I 1r '1 ,11 i!.,;,II .....II ·111/ -----J______---.----;-.----'--~--~,-1 ..t-I---.['f 'il'.--F~E'I E 'r'f:1:;;;;1--'."f I .Jrf-;. 1.•.''.I...'.'.',::'.''.'Ii;..i 1 1 '1'··l·'.I I .,1 ...+'n ..~lt\t:'IN'~A~Ni!';E.MI«i'r-.1TI···'1 1 .,-1'!,'"'"J"I .)'II '1 1 I ~.,.; !03':'__'_1 ',!:i : :-I I ,I 1-.....I l I \.!i I ;1 I. 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SLOUGH 9 -Groundwater observation wells Stage Comparison Figure 4.1 (j) PREPARED FOR: [}{J&OO~&c §[ID&®©@ SUSITNA JOINT VENTURE 1 1 1 -,-~l ····-1 ----1 1 J --1 J 1 SUSITNA JOINT VENTURE .NQaN ••t:t.aeOLDtiilIPT.HygflQLClCilUITa .UR~.VDRII '~~~~i·-:""""'-·I·_·-;-'-''':.·-I~-,._~~I'~"'--1'-·':"'~t~·:.+..~+,i.-u-+m~-·~r~--l-U+~w+l-+ml++~++++Wll ~.~~i or!+1 -~~ff'I ,~·t-+-m''.!-.!..,I • ",I',!.'I I'I I I I l''I 'Ii I ::1::.i:I:i ~'j iii I'I I 1 1 ' I .'I ",I:,I I I,!0 -Stage Well 9-lA(feet,ITISI)I I I I 1 I I II i I I ' ))!I I I I I ',,0 -St eWell 9-3 (feet,ITlSI .,I I I I t r I ;r !' .--,.-...,..';f'-i I"~".,11 ;!ii _-St~~IOW,Susitna R.at Gold Creek (cfs)1-11'1'-','+I'-~i-rir • , "I I I II I!, ,,I '11',-~-~I Ii:'I I J r I iii I ,I I I I I I ' , eo!,L.-,..-,-._...-.-----.~".,1.,+..~j-i+'H+I-+j+1.i -Ii'-"nlI-~.~-,Li~-L ,.j~J-4'"rl,I'."t+-;"~..L.r--:-,-'-~'~.""'~+~.I--1.'-";"-:.~-~',."'. r I ,j 'I I I I I "I II''I I I !).,.-.f .I I,.I ,II I II'",I I I', I I I 'I 1 I I I I I --'j I!I I "i I [Ii! 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WELLj9 -I A I I I !I ,I I l I I III I !i 'I I I II 1 .I I'j:I I',I I 1 I I I !!'.::" ,'I •I I I I I I I i I I I I I .....,I.I j I'I til 'I'II '80e .,I I .I J I'I"- .I .!'I I I .!I'I '1 I i I I i I I I I r I I I I J I I,I ,I I'i-.-.-..--,-,-.-....-.---',---'"-'"---,..--,'-,_·t f-'f ..·tt ..-IT-t·-f ....--r -.~..+-f-l',-4,--,..W·-I,-J'~-T''''''-~"......-.-'-'-.-r....,.--'.....,.-;-.'T, I I !I I I'I I .I 'I t I I j "'I)I I I ,I t'I iI 'I I'I I '....j I ..'I "III,"I I I I I,':'.I··'11-,l'I 'I I I j I .-'.I ...I·-...'!I··,'I I I ,"I I ,;,I i I I ' ' :I I i [I ,,11 ['Iii II !I··..It······.,I:.I I,I i .1 :I,II I II I \'II I ....II 'j"'" -'----t-,·---I-'-1-_:'-~-'--+-"-'-'1-~-11'-T·tTr-J -II -~ul---1--rH-lTtt -..-----.·T·-r-·..+-t-""[·'-f-f-·U -~+.+-t··-~.:-1.,•...'I I I ,I I t I j It I lit'1 j I...11 1...1 'I '1'f "I'I,I:I,I.i _!I I .,.......+,-.._I I ,i , "::I;I:II I It -)1 I II,I j I I II ..,·1 II -j-1-I Ii, e08 .I!I"!I I I 1 I f I I I I I I I 11-,I,'ItTT ...,I I-~_L __I __-1 __-.---"--~+-'4-ill +.,,-t -+n'l'I '--'-in~..--..TI..... ,I ,I I I ,I I I I I I f I I!I l!.1 1 11','.~..J~,JJl ; :".I :I ~::I i I I I III I II r I 1 -I I !I I -il-Iil f,..-.~.,~~t:NDL~FDAtA-III-H+11-.-r ~1·*i~T1L +)1 _]1_1--.-.f!··'/.",'.~'WELL 9-3 I I I I I I II I II I ...I I [·1 '1'"I'j , :!i f. r ,i ,!~'.','!'I,'I I'I II I!,1 ,-,ii,':,i"I Ii :Iii 04 U"!!i ::I I I I 1 IT I I it 11 1 I I I I I ttllit i I ;I i-----;--------....,..,....,...I iT-'..I -,,I I I I I I '1'I ,., ,'i I I 'I I iT-II -I I . -,-...-._.-..I·:!I IiIi '.I., I I III!I I I -..-···1·.,1-,I .1 .. •i'I.!:!I Ii!I 'III --T ---:-.--1 j II 'i -!f ! --~~'..--~---.'-.---~.--~.~.r-1_.l-.-f.---l--~-~-.I--tfl+~HI"-r-;iji-t-'+-+,--,I,:,'' 'I I j:j If!i I I:;iii I :I I I 'j j ........---..I f -,-...,..1-"......,T r: I".!i I I I I I -.I I -, .-f i..I "'1'I,.'.".~.<O'T 'I ,1 i ' -I'.,I I -I I I' . ,'i I .~I'I!,!I II I 111 I ..j I 'I'InI .I I ill.!',..i i ;.!;.i';IT.-je03' .,.',I ',',1 ,','[j I -i'!Illt··H i j [!r Ii '--,-i ~'---~~.._~~I-;--;--[1--1--mf,-t I ..1 1'''T'-.'1"I I I !!ITnii' I I •"I I I I ·11 f I I 1'". . -II ,j,I j'lI'11 i:"":i'lit'..t~11 ,1'1 ~-I-l ~'f j !'f,.•nl···1,1···.!11:.'+:~ lit co 'II CO'i II'co ·-cO I .!II).co co··co!'I"····1 co'··....:::.:iT ~:T,--h,......;T+-j'1-[I r ~--+--r -~r.-r -,I---j-!'2..._j-~--~-~-+-Cil-I 'ia"T~.q+-t.-+~o , , 'I ,.,...I I vI -,..'f I I .,..l'"\j ~"1 j ·1 I,,.I 0 1[".,..C\I'N 'NIII'to)l\l I'"I I I P !':I : I '...................,..I ......I .,.....1.1',!;... ...'&\I ..t\I ...I INN "!'····1·Nf·...&\I N,N I.I N I I , ,IN,:I I 1 I j L I I I I I Ie02_....~,...'I'I ...,I _.,1 ~1 ..,..Ii,..r-I...I I ~I :I .....1 ':I'" PREPARED BY:.PREPARED FOR; ;.::.;~~Jf0l SLOUGH 9 -Groundwater observatwn wells [g]&OO~&0 @:lID&®©© -R&M CONSULTANTS,INC.Stage Comparison Figure 4.1 (k) 10 ' 9 8 7 MONTHLY RAINFALL EXCEEDANCE CURVES TALKEETNA,ALASKA PROBABILITY OF MONTHLY PRECIPITATION LESS THAN ORDINATE VALUE 9&98 95 90 80 70 60 50 40 !O 20 10 ~ -------±:-..o.-l'.::: -4 - Z'.....,.... ~ ...J 2CI:...... CI: Zo... CI:.... a. a.--~7 %...-Zo 2: ...J ~ ~o A... .--+-~.:1:::;::t:::::: ............., I '..:--..; l i I I !""""'J.-\tl I i I ~1&1 I !!!i ::....... II 1 it 'I'!I I ,~ ·--i--<-+-- ·::t~...::±=::f--. ·:1 -t -+.'."::'1---. ---;-. _.'I-. _i ~.....;;- 2 -r+T' -~;--r rr +--4-t-+-+-+---+-~~-tt:ttttt=t:t::t:tttjjj:tttJjj:tttttttttj:tt1ttj:tttttt:ttttt!tttt~ttutttttti:t1:t:t:t::~jI·!1 I"t-tH+++l-++-I---l-+-H4-1H-++H,++++++-++,H,+-H-++++++HH+t+-t+t-t++++-++--Hr-I++-H-,'rt -- .... I I;,I'I I i ( !I i I-;+++H++H--+-+-+-+-+-+++H+H·+r+++-i-f-++t+-H++-++++Hr++tt+++H-i-H-t-l'+ti-H t -1-+t I ;.,4--'-_1IT-T· .t-l , i I , 5 10 20 30 40 50 60 70 80 90 95 PROBABILITY OF MONTHLY PRECIPlTAT10IN GREATER THAN ORDINATE VALUE ~, PREPARED BY; R&M CONSULTANTS,INC•. Figure.5.1. PREPARED FOR; [M]&OOC6&C§[ID&®©@ SUSITNA JOINT VENTURE 2.0 ~ I 1.0 .9 .7_ .4 I !,,, :,I ,,,,,,, :,!,, I :,,,I , :',,II!i !I i 1 I '!!iI;I , j :,I !I [1\!:i I,I,I,I \\~ :1. 1\' I j It:' !1 i ~Ii:;) !,11l ;j I ! 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'I!i I I;j ~.j i \i .i ,, IIII1 ,I ,.\,III Ii,I I,i!I I, I!II II i IiiiiIII!' ,!!'II i , Iii i !i I I i I i i 1 t·~1,\ !: 2..0--- ""'" .5 .3 __ rn.., %,-U ~.2 z 0 "'-l-I' C ;!!: l- I :~!a::i. U .1 j:' lI.Ia::.090..- .08 - .07 _ .06 - .05 - .04 _ ~O3 - '.,,,!I , !;,I,,I :I':""'"I !,I I ',"""""1..1 I I,,I I ,'..~I I ' i I III,I i \1 s:! i',!;!1.:..<1'I\!I :,I IJoiII Ill!pi"'"j i i 1 "J \1' :i !I ,I I :ii";'"!J I !I,I I ' ,I I ! II i Iii 'i:,, ,II II I II I' II II!I , I ,II! i j i'!11 i II !!I Ii II i: I!:I I';'i \i I.j I ~: I'' :', l'I, ,;', I;:I I I I I; i,i ~I :'I I I I;J I: f iii::, II' I I" ,' ,i !i'"':.,:'\ :;~:Ii! ; i i ,\.,;'\i I I • 1008090 EXCEEDED O I''L I'..i•L.J.-~_.L-.---'----II...._...!----I._-'---.l..":"-"""'-J.,.;B-J--4-4:il---'---.l.._l..-..--'-------'-""-----J.._-'--- o ~w ~~~~ro %OF DAYS PRECIPITATION EQUALLED OR PREPARED BY:PREPARED FOR: ~&M CONSULTANTS,INC. .NQlI.......o.l:lI ...aa·••T ....,ORCU..C1I;uay.aV""'.VOA. 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(J w .1a:.09 _a. .08 _ .07- .06 _ .05 _ .CoL .03 _ I""" I .02- ! :,,,,,I i : I ,:I ,,!I ,, ,i,I <;: I !'J .., i ~ I ,;!i J ,~,il :I I i I ,I I ,ii I I I 1008090 EXCEEDED .0 L..L..---'-_...I..---l.._.l.._...I----l__· ..:..J",O."""I'_IL.,'.;..o'I....'"",,''i.J!..·-4:,Lal L..'J......__L...;..;......L,.·;.,;,''.:..'...!.-'.;.,;""l._...l.----l_......_i.--.....J..._"-----' o 10 20 30 40 50 60 70 %OF DAYS PRECIPITATION EQUALLED OR PREPARED BY:PREPARED FOR: R&M CONSULTANTS.INC.Figure.5.4 SUSITNA JOINT VENTURE -_0••---T --- 2 •i='tB ~;J. < !"1 1 i.9 .8 ,7 .6 ,5 .4 ~-<It Ql &:. g.3.--- Z ~?..... <C ro....... 0-I~-0 ,1\1', lIJ ~I r\a: 0-1'1 .1 1"\l\ .O:~ .08 .07. .06 --. .05 1--1-1--._.-~=l=t ," .04 +- - ,.03 .0" - 1\ II .01 1.1 0 10 20 30 :110 50 60 70 80 90 PERCENT (%)OF TIME PRECI PI TATI ON EQUALLED OR EXCEEDED PREPARED BY:PREPARED FOR: ---c31.I c:-~FIGURE 5.5 [g]&'OO~&'c §[ID&'@@@-1l~'::_ ~&M CONSULTANTS.INC.SUSITNA JOINT VENTURE......Ulll.·•••a.a"OD'.".I4Yr;:J.II:ll ...Or;t............"'....1:11•• 1 )1 ]I J ]~'i ]!J I i ~ Jl-H .... -+I 1 I I 1 1 1+++++-++1 I I I I 1 1 1-\-+++++1 J".I I.... t;;ii ~..--t-+. +-I-++++-I -1---+--1--1--1--1 .-f-:t , , , , , , j ..... tt H-H-+t::¥::H- ..H~++-H··1?'+-+-+-+-H -,-~+-+-+-+.+. uffitl1lll-H±Hllli LUd' !J:: -+-I=tjit-tti-I ::tl=tt::j;.1-H-I-H-++-l-LJJn-rr+-Ll'~-~r+- ~tt --..I 1.--....~-=t::!=+tI+tt+:+=t=t-tli41i::::t --.~--::':::'~..~~~.--..=.~--·t.::l+tm-ttt:+:+:H=tmttttta11tmtt1B=E= j.- +~-+-~, --{- .t . ::'Ii 11 :I.I i [.!J!11.1 !r ~j:±-I~~- -..--..---1---'----~1-~Iii....i!l,i'l :i I ~t·~-~.-.+--f--1--.•-f---j ;"'+-..:-.L .J.':-H---l-~~Il ...;.~..-~·H·-i"-i,'--I-+'++-I++-++-I-++-++-IA--+-++-I-++-++-I+++-H++++-I+++-H-l-H--H-l-H-+-+-j 0:000,2r QGe:T 0.67 (R2 :0o:r:5J ,.--.~~.1-.-~~ -;-Oi'~TI~t~~tc-fOJ~2:·:frfl:'r/~-,L>,--r--,n :-; J.l·- -- --..--..-_....j1_I-.._~_~.I 1+++-111 +-1-1 -'1=£- I·· 1-- i-'II-++tt'::~R:::1=]tj::~=ilm-'::nJ~~-j~T:::t:t::t::l=ttrf~+::l-::::::j::w-~::l:t-H:++=fmm\lJ"~ +-I·H-I·II ~--+-I--l-~Itjll-t"'.. 2,IJI~Ulmtm)J_~~ltttlfimitl~l-lltf 6 1 'JT 7'nw[I ....._._. 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BN13INBIiIR.tJlaDLCDIBTB HV'I=IRI:2LDQISTB BUR~IIVQRB Figure 5.6 PREPARED FOR: [}{]&OO~&0 ~[ID&®©@ SUSITNA JOINT VENTURE i 6 7 854 I I I I 456789 I 10.000 2 3 Q SUSITNA RIVER at GOLD CREEK Ccfs) , 3 I 2 I 1,000 -""'''"""'"' , I """1"""'"1""'''""'"""' ~•~ - I -I -- - - - - i I- - - I-I-++l+~- IU - I I I I )I I I 1 2-- 0.1 0.2 0.3 L 0.9 0.8 0.7 0.6 0.5 0.4 :J: t!l ~o ...J U) o 3--- 10__ 9- 8 __ 7 _ 6 _ 5--- 4--- -III-U.... r i - PREPARED BY: ~.=;~t~t1_ R &M C·-LO=N=S==U=LT=-A=N:==T=S~.7:IN'=:=C=.= FIGURE 5.7 PREPARED FOR: [}:{]&ffi3~&C§OO&@©© SUSITNAJOINT VENTURE 100 , i ;""'"90 ~ 80 70 60 ",.,50 II • , 40 -, -30, 20 F-' I I r 10 ~9. 8 7.....I 6i (' l 5 r-4.-.I 3 ""'"', 2, ..... I'"... I~U-I I I I r- i I ,"" 0~9':~ 0.8" O.T 0.6_ 0.2 O.l. O.OB. 0.07. 0.06. 0.05. f-+-+-+-+-+O ..I '-"' I-Y I I L !", I I I I I I I I':I~i ! I i !I,I~!I ,I i !I I I I I 0.04, . 10 _i_i_ t ,-' 20 30 JUNE 10 '~.~~ JULY 1 10 '.20 AUG . 30 ~_.'--"i --_.,- 30 10 OCT SUStTNA JOINT VENTURE ~I=------------,-----------------,----;,;;;,;;;-;:~;:-----~ I PREPARED BY;FIGURE 5.8 PREPARED FOR:~~&OO~&C~®&~©@ R&M CONSULTANTS,INC. pdI '.."0........-Q.O..QQ ......MY'PRCt.Do;JI.T.~RI,I.VO". ~---~,--~------------------------