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Home My WebLink AboutLake Elva Declaration of Intent 1980I Et.Vfl I tJatf I 8_. I I I I I I I I I I I I I I I I I BEFORE THE FEDERAL ENERGY REGULATORY COMMISSION DECLARATION OF INTENTION LAKE ELVA HYDROELECTRIC PROJECT PROPERTY OF: Alaska Power Authortty 334 W. 5th Ave. Anchoraoe. Alaska 11&01 DILLINGHAM, ALASKA LIBRARY-COPY ~• (® PREPARED FOR THE ALASKA POWER AUTHORITY BY ROBERT W. RETHERFORD ASSOCIATES CONSULTING ENGINEERS ARCTIC DISTRICT OFFICE OF INTERNATIONAL ENGINE.ERING CO., INC. ANCHORAGE, ALASKA MAY 1980 ········-----~·~ . ---~· ------ BEFORE THE FEDERAL ENERGY REGULATORY COMMISSION DECLARATION OF INTENTION BEFORE THE FEDERAL ENERGY REGULATORY COMMISSION DECLARATION OF INTENTION The exact name and business address of the person to whom correspondence in regard to this Declaration of Intention is: Eric P. Yould, Executive Director Alaska Power Authority 333 West 4th Avenue, Suite 31 Anchorage, Alaska 99501 {a) The purpose of the Lake Elva Hydroelectric Project is to provide the communities of Dillingham and Aleknagik with a source of clean, renewable, and cost-stable energy while reducing the requirement for utilizing fossil fuel for electrical generation. Table 1 shows significant data relating to the Lake Elva project. Reference is made to Figure 1, which shows the maximum, average, and minimum operating pool levels. The installed capacity will be 1,500-kW consisting of two 750-k\~ units. There is no plan for future increases to the installed capacity. The two turbines will be rated at 1,000 horsepower when operating under a 300-foot head. A curve of turbine discharge versus output at average and minimum operating heads is provided as Figure 2. apa18/j -1 - RESERVOIR Drainage Area TABLE 1 SIGNIFICANT DATA LAKE ELVA HYDROELECTRIC PROJECT Normal Maximum Water Surface (msl)Elevation Minimum Water Surface Elevation Surface Area-Normal Maximum W.S. Live Storage Average Flow Regulated Flow DAM Type Maximum Height Crest Elevation Volume Impervious Membrane SPILL\vAY Type Crest Elevation \vi dth Design Discharge WATER CONVEYANCE Pipe Line, 48-inch Dia., Length Surge Tank 48 11 Dia., Length Penstock 42-inch to 36-inch Dia, Length POWER PLANT Capacity Maximum Gross Head Type of Turbines TRANSMISSION LINE Voltage Length Conductor Size ANNUAL ENERGY Prime Average Annual Secondary 10.5 square miles 350 305 720 Acres 29,000 Ac-Ft. 52.5 c.f.s. 50 c. f. s. Rockfi 11 137 ft. 357 80,000 c.y. Aluminum Alloy Ungated Side Channel 350 100 Ft. 7,400 c.f.s. 4,100 ft. 150 ft. 3,200 Ft. 1,500 kW (2 Units) 300 Ft. Horizontal Francis 24.9 kV 29 mi. 4/0 ACSR 7,972 MWh 8,370 MWh 398 t~\.,th Source: Robert W. Retherford Associates. February 1980. Recon- na ssance Study of the Lake Elva and other Hydroelectric Power Potentials in the Dillingham area. Prepared for the Alaska Power Authority. apa18/j - 2 - !- LLJ LLJ LL. z z 0 ~ > LLJ -I LLJ II 400 350 300 250 200 0 10 -~~-------- 10 9 8 AREA (ACRES X 1000) 7 6 5 4 RAGE OPER - __!____ --- I --------- 20 30 40 50 60 70 CAPACITY (ACRE-FEET X 1000) C® INTE~~~~:~~~~~~~~s~;c~A~;~v~~o~ COMPANY, INC. P 0 60X 641J ANCriORAGE. ALASKA 99502 PH:)r>E (907) :J.;.:-2SB5; TELEX C26-3EO 3 2 0 EVEL -EL. 35 O(MSL) INGPOOLL VEL-EL. 32 (MSL) ----- RATING POOL LEVELr EL .3 5 ( MSL) ---- 80 ------~- 90 100 LAKE ELVA AREA-CAPACITY CURVE FIGURE I 110 0 Q X 3: :liC 16 r----r---r---r---,----,-.----r----r-1---r-J--r-r'----, 15~---+----~---~~---+----r----r-----+---~~-~-r--~ // 14 1-----t---+----+--+----t-+-~/ 11'---t+-' ---1---1 II 13 12 II 10 9 5 6 0.. 1--a IJJ 7 3 IXl 0::: :::> 1--6 5 4 II v 10 20 30 40 50 60 70 TURBINE DISCHARGE (CFS) INTERNATIONAL ENGINEERING COMPANY, INC. ROBf'RT W. RHHERFORD ASSOCIATES DIVISION A'<C TIC. [l•STRtCT OFFICE P 0 BOX &410 A'ICH0'1AGE AcAS><.A 99502 ?HO".:: :'9C7} :J.!-4-2:JCS: TELEX 625~380 80 90 100 TURBINE OUTPUT AT AVERAGE AND MINIMUM OPERATING HEADS FIGURE 2 (b)(l) Reference is made to Figure 3 which shows the stream to be utilized and the approximate location and general plan of the project. (2) Reference is made to Figure 4 which shows the status of lands occupied by the project. (3) Reference is made to Figure 5 which shows a profile of the river within the vicinity of the project and the location of the proposed project. (4) Reference is made to Figure 6 which shows a flow duration curve and Figure 7 which shows a hydrograph for the natural and regulated flows at the damsite. There are no published or unpublished stream flow records for Lake Elva. A gage has recently been installed by the U.S. Geological Survey at the outlet of Lake Elva. There is no direct streamgagi ng data available for Lake Elva, although a gage was installed in late 1979. The average annual runoff of 39,440 acre-ft. was derived synthetically for the project. A dam constructed to spillway Elevation 350 feet waul d provide 29,000 acre-ft. of active storage capacity which would be filled from a 10.5 square-mile drainage basin. Two methods of analysis were used to determine the streamflows for the Lake Elva Hydroelectric Project. 1. ~lethod 1 As the drainage area for Lake Elva is 10.5 square miles, correlation with the Nuyakuk, the Chicknuminuk and the Upnuk Rivers, all of which have gages, provided a typical discharge apa18/j - 5 - per square mile data for streams in the area. The runoff for these three rivers is as follows: Drainage River Runoff in Area Discharge Nuyakuk 4,300,000 a. f. 1,490 mi 2 3.88 ft3 /sec/mi 2 Chiknuminuk 800,000 a. f. 286 mi 2 3.86 ft 3 /sec/mi 2 Upnuk 280,000 a. f. 100 mi 2 3.80 ft 3 /sec/mi 2 Rounded 4.00 ft 3 /sec/mi 2 The area tributary to the three gages is generally at lower elevations north and east of the Lake Elva basin and further from Bristol Bay (the direction of prevailing precipitation). Also, the NOAA Technical Memorandum NWS AR-10, Mean Monthly and Annual Precipitation, Alaska, (1974), indicates the Lake Elva drainage is in a higher precipitation 11 pocket 11 than the surrounding area. Accordingly, by judgment, the 4 cfs/mi 2 average of the three gages was increased to 5 cfs/mi 2 . 2. Method 2 An a 1 ternate method of analysis, used in determining the streamfl ows, required the cteve 1 opment of a probab 1 e set of precipitation and total volume of precipitation values on a month-by-month basis, using 20 years of recorded precipitation data for Dillingham and the above described NOAA Technical Memorandum. Mean temperature data for Dillingham was subsequently correlated to the Lake Elva area to estimate the probable monthly distribu- tion of precipitation runoff in order to develop a synthetic runoff record for Lake Elva (Table 2). apa18/j -6 - It was assumed that 10% of the precipitation would be lost due to evaporation and other losses. From the synthetic monthly streamflow data developed in Table 2, a programmed step-by-step calculation of runoff and draw using a 29,000 acre-ft. reservoir was used to determine the prime power and energy available from the Lake Elva Hydroelectric Project. The average annual secondary energy was then computed using the average annual streamflow over the 20-year synthetic record. apal8/j - 7 - N I OK-wtmu/~tse:·•~WiellHOHol '· ~·- . Wiii6¥:NS¥W '~ Olt9Xot o• I • 30f~:j() l::>ltllSIO Oll:ltl¥ ' NOIIIAIG ll.l'll:xlll'l GIIOiilliiKUII 'M .lllii.OII e 'ONI 'ANVdWOO ~NI~33NI~N3 1VNOI.LVN~3l.NI _ :J 'NMOHS lON 1'1M'1~0HliM 3N 11 NOI SSI~SN't~l 031'11 :lOSS'! . 3l'1lS Ol 1'1AO~dd'1 . 3Ail'1lN3l ~0~.:1 030n1:lX3 lns'9961'£1 3Nnr 03l'1:l'1A 'S6ZZ 1'1M'1~0HliM ~3MOd ·-·- . 3N11 NOISSI~SN't~l ~N I lSI X3----- 3N I1 NOISSI~SN't~l 03SOdO~dr---- 3l'1lS Ol 03AO~dd'1 ~h A13Ail'1N3l SON'11 ~. 3l'1lS Ol 03lN3l'1d SON'11 SON'11 1'1~303.:1 ON3~31 z _, m i-nt.~:n o 0 · "'Z ~0 i; l> (~Xr,-. ~ ~~~.,·, ~ -~~ ': :, ~ 0 i~,,.~~ z lo. ~ :_. :r :;: ~.; ·::) ~ }:» ~.r~-nr-~:.C~ m r-,:;~ > Z " "' G1 ~~::-~ -~~ E z ~~ :~ '""' m -:r ~ m ~' 2 :0 r,1 < _ ., G) c ::0 IT\ 01 ~ z ~ C> () 0 ~ TJ l> z ~-< z () "' 400------------------------------------------------------~r------------------------------------------ LAKE 300 ELVA PIPELINE 4'-o" 0 SURGE PIPE 4'-o" tJ '(;"- 200 ,e~~PENSTOCK ~~ POWER>IOUSE 100 · fJ DRAFT EL..50 0 LAKE NERKA SCALE 0 50 100 200 300 FEET ~ ....... _,........... ......, SCALE 0 500 1000 2000 FEET JPiie"SS:PNiiJ'! W 'bif3ji;;_.u, l VERTICAL HORIZONTAL ~LVA CREEK AND PENSTOCK PROFILE 0 w I- <( ..J :::> '(::;:::::::::::::::::::::::::::: ·.·.·.·.·.·.·.·.·.·.·.·.·.·.·.·. {lll!l!l:i!lil!l!l:lli 0 ..... 0 w 0 I() 0 v 0 r<) 0 C\1 FLOW 1000 X ACRE FEET PER MONTH INTE~~},~~~~:~E;,~~~~~Js?;~~~;~~~~ COMPANY, INC. P ':' BDX [..:; J AN::rl(JQAGE ;.._t-.Sf'..A 99502 PH8~~: (9C7: J~..;-2585 TCLEX 626<380 FLOW DURATION CURVE FIGURE 6 0 w 0 Lu w (.) X w (/) 3= 0 ....J lL w ~ 1- lL 0 w <.9 <l: 1-z w (.) n::: w a... t-w w lL w 0::: u <( X 0 0 0 z 3: 0 _J lL 7- .-----NATURAL FLOW 6- 5- 4- 3- 2- 1- o--~~~~~~~~~~~~~~---L--~~--~L---L---~--~ JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC INTERNATIONAL ENGINEERING COMPANY, INC. P.OSERT W. RETHERFORD ASSOCIATES DIVISION AHC1,(, [1!5TR!Ci QC.F-~CE P 0 8\)X &-!10 A'\I(";H('tHA.Gf ~lAS..: A ~5;::2 PHC"~C i;C;1 344 .?~: ::::-... Ex lJ:..'6-3kV HYDROGRAPH FOR LAKE ELVA PROJECT FIGURE 7 apa18/k1 TABLE 2 LAKE ELVA HYDROELECTRIC PROJECT MONTHLY DISCHARGE (IN 1000 ACRE-FEET) AT THE DAMSITE YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC TOTALS -- 1930 0.9 1.4 1.7 3.4 5.2 6.9 7.4 7.2 6.1 4.0 2.3 0.8 47.3 1931 0.5 0.8 1.0 2.1 3.2 4.2 4.5 4.4 3.8 2.5 1.4 0.5 28.9 1932 0. 7 1.0 1.2 2.5 3.9 5.1 5.5 5.4 4.6 3.0 1.7 0.6 35.2 1933 0.5 0.8 1.0 2.0 3.1 4.1 4.4 4.3 3.6 2.4 1.3 0.4 27.9 1940 0. 7 1.0 1.3 2.6 4.0 5.2 5. 7 5.5 4.7 3.1 1.7 0.6 36.2 1957 0.7 1.1 1.4 2.7 4.1 5.4 5.8 5. 7 4.8 3.2 1.8 0.6 37.1 1958 0.8 1.3 1.5 3.2 4.9 6.4 6.9 6.8 5.7 3.8 2.1 0.7 44.2 1959 0.6 1.0 1.2 2.5 3.8 5.0 5.4 3.2 4.4 2.9 1.6 0.5 34.2 1960 1.0 1.5 1.8 3.8 5.8 7.6 8.2 8.0 5.8 4.4 2.5 0.8 52.3 1961 0.8 1.2 1.4 2.9 4.5 5.9 6.4 6.3 6.3 3.5 2.0 0.7 40.9 1962 0.6 0.9 1.0 2.1 3.3 4.3 4. 7 9.5 3.9 2.5 1.4 0.5 29.7 1963 0.8 1.2 1.5 3.1 4. 7 6.1 6.7 6.5 5.5 3.6 2.0 0.7 42.4 1964 0.8 1.2 1.4 2.9 4.5 5.9 6.3 6.2 5.3 3.4 1.9 0.5 40.4 1965 0.9 1.4 1. 7 3.4 5.3 6.9 7.5 7.3 6.2 4.1 2.3 0.8 47.7 1966 0.9 1.4 1.7 3.5 5.4 7.1 7.7 7.5 6.3 4.1 2.3 0.8 48.8 1967 0.8 1.2 1.5 3.1 4.8 6.2 6. 7 6.6 5.6 3. 7 2.1 0.7 43.1 1973 0. 7 1.1 1.3 2.8 4.3 5.6 6.0 5.9 5.0 3.3 1.8 0.6 38.5 1975 0.7 1.0 1.2 2.6 3.9 5.1 5.6 5.4 4.6 3.0 1.7 0.6 35.4 1976 0.9 1.3 1.6 3.2 5.0 6.5 7.1 6.9 5.8 3.8 2.2 0. 7 45.0 1977 0.6 1.0 1.1 2.4 3.6 4. 7 5.1 5.0 4.3 2.8 1.6 0.5 32.8 Average 0. 7 1.1 1.4 2.8 4.4 5. 7 6.2 6.0 5.2 3.3 1.9 0.6 39.4 % of Average Annua1 1.9 2.9 3.5 7.2 11.1 14.5 15.6 15.3 13.0 8.5 4.8 1.6 100.0 (c)(1) The Lake Elva project would be operated on a base load mode. Whenever there is surplus water in the reservoir, which would normally be discharged over the spillway, the project will be operated up to the installed capacity in the powerhouse. (i) There is insufficent data to develop a 10-day hydrograph. (ii) See (i) above. (iii) Hydrographs showing average monthly flow for a low water year are shown on Figure 8. (2) The monthly system load curve for Dillingham is shown on Figure 9. (3) Figure 10 shows the proposed reservoir operating rule. apa18/j -14 - 0 0 0 3: 0 _J lL. 5- NATURAL FLOW REGULATED FLOW 2- 0-~~~~--~--~--~--~~~~---L--~--~__J OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP HYDROGRAPH OF MONTHLY LOW FLOW ELVA CREEK FIGURE 8 150- 140- 130- 120--1----t uo- roo- 0 X 90- DILLINGHAM PEAK LOAD (1980) INTE~~e!"':!.~e~!~~~s~~~A~;~}t~o~ COMPANY, INC. ~°CTIC DISTRICT OFFICE P 0 BOX 64 10 ANCHORAGE AlASKA 99502 PH()!';~ (90 7) J.S~-2585. TELEX 626-380 SYSTEM LOAD CURVE DILLINGHAM, ALASKA FIGURE 9 ....1 (/) ::e ..... w w ...... z 0 ..... <( > w ....1 w (/) :i 0:: 0 > 0:: w (/) w 0:: 350-- AVER GE W TER YEAR 345-( ONST NT DRAW OF 52.5 CFS) I 340- 335--I I 330-EAR F 52.5 CFS) 325-- 320- 315- JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC INTERNATIONAL ENGINEERING COMPANY, INC. ROBERT W. RETHERFORD ASSOCIATES DIVISION t.;.tSIIC [)IS7t:i:C'7 Ot:FICE P 60X 6-!1 (. A,r..;.::::H:.~~AG~ ALA:.7"'~A ~50? F'HJ~,f (~£;. 3~..;·2585 TELEX 6?5-3SO ANNUAL RESERVOIR RULE OF OPERATION LAKE ELVA FIGURE 10