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Bellefonte, Units 3 and 4, Attachment 02.04.03-8M: Dam Rating Curves

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Bellefonte, Units 3 and 4, Attachment 02.04.03-8M: Dam Rating Curves HIWASSEE DAM October 1999 April 2001 Hiwassee ii RESERVOIR OPERATION OVERVIEW Hiwassee is a multipurpose tributary project located on the Hiwassee River in western North Carolina. Hiwassee is operated for many purposes, including flood control, augmentation of flows for navigation and water supply, hydropower production, water quality, recreation, and aquatic ecology. It is a concrete gravity dam with 2 hydroelectric units installed, one of which is a reversible unit capable of pumping water from the tailwater back into the reservoir. Construction originally began in 1936, and the dam was closed in 1940, with one unit placed into operation at that time. In 1956, the second unit was placed into operation. Hiwassee Reservoir has an annual pool variation of about 62 feet during normal years. This fluctuation is necessary for provide for seasonal flood storage and for economical augmentation of flows during the drier seasons of the year. In abnormally wet or dry years, the fluctuation may be significantly more or less than this. Hiwassee Reservoir is fed by releases from TVA's Nottely and Chatuge Dams in addition to unregulated inflows from the 565 square mile local drainage area. March 2001 Hiwassee iii Table of Contents Hiwassee Reservoir Vicinity Map ............ .......... °.............. 5 Figure 1: Switchyard and 2-unit powerhouse Figure 2: Spillway and powerhouse ......... ... o.... o.... .... ....... ° 6 General Plans, Elevation, and Sections (TVA drawing 10N200): Figure 3: Site Plan ................... ......................... 7 Figure 4: Plan, Downstream Elevation ar id Upstream Elevation .... 8 Figure 5: Section A-A ................. ......................... 9 Figure 6: Section B-B ................. ........................ 10 Figure 7: Section C-C ................. ......... ............... 11 Figure 8: Section D-D ................. ........................ 12 Figure 9: Section E-E .................. ........................ 13 Figure 10: Section F-F ................ ........................ 14 Figure 11: Discharge, Area, Capacity, ind Tailwater Curves .... 15 Location .................................... ........................ 16 Chronology ................................. ........................ 16 Project Cost ............................... ........................ 17 Streamflow ................................. 17 ......................... Reservoir .................................. ....... ..... ..... 18 .... Tailwater .................................. .................... I... 18 Head (Gross) ............................... ........................ 19 Reservoir Adjustments ...................... ........................ 19 Dam......................................... ..................... 19-20 Power Facilities: Intakes ............................... .................. 20 Penstocks ............................. 21 .................. Powerhouse ............................ 21 Figure 12: Powerhouse and Generat:Lng Units (Photo) ....... 22 Hydraulic Turbine (Unit 1) ............ ........................ 23 Pump Turbine (Unit 2) ................. ..................... 23-24 Generators ............................ .... 24-25 ................. Generator and Turbine Modernization ... ........................ 25 Electric Controls ..................... ........................ 26 Transmission Plant .................... ........................ 26 Figure 13: Single Line Diagram of Main Connections ....... 27 Figure 14: Switchyard (Photo) .... ........................ 28 Transmission Plant Data ............... ........................ 29 Reservoir and Power Data ................... ..................... 30-32 Unit 1 Operating Characteristics 64,000 KVA Unit ................... 33 Unit 2 Operating Characteristics of Pump-Tuirbine Unit Generating ... 34 Unit 2 Operating Characteristics of Pump-Tuirbine Unit Pumping ...... 35 Spill Compilations ......................... ..................... 36-38 Maximum and Minimum Elevations ............. .................. 39-40 ... Average Weekly CFS ......................... ........................ 41 March 2001 Hiwassee iv Table of Contents (Cont.) Annual Operating Cycle ................................... .......... 42 Reservoir Areas and Volumes .............................. .......... 43 Reservoir Releases Improvements .......................... .......... 44 Construction Data: Personnel, Housing Facilities, and Quantities....... ....... 45-46 Construction Plant Layout and Schedule .............. ....... 47-49 Construction Schedule - Unit 2 ....................... .......... 50 March 2001 Hiwassee 5 JH4 TENNESW VALLEY AUTMOPMT MAPS MmDSURVEYS fMANCH HIWASSEE RESERVOIR VicENITr MAP SCAM O1 man 0 1 4 March 2001 Hiwassee 6 FIGURE 1 Switchyard and 2-unit powerhouse, 1956 FIGURE 2 - Spillway and powerhouse, 1956 I9 o 0 SITE PLAN HIWASSEE SCALE 9 50o IR000 RESERVOIR - .. .- - - , - HO (D (D ,! March 2001 Hiwassee 8 FIGURE 4 DOWNSTREAM ELEVATION I Rock Surfee profile of Axis UPSTREAM ELEVATION March 2001 Hiwassee 9 Figure 5 ,-AXIS OF DA M Roadway, EI.15 3 7 S-- -Fill of/ I524.17 */"n -3 9grout holes 40 •4P Orai at o SECTION A-A March 2001 Hiwassee 10 FIGURE 6 AXIS OF -Roadwoy, F/l 15375 16 -Conduit Emergency Gate Storage .41 Chamber 4q q I- 6'M Forrru -4 .of% in - Drains LO• " "p" " l e•'fin0.5 " --slope Iki.a25 3f. grout holes Foundetion ,?L0# at 510"*fOLc. 401-r4,#'D~rrils- -AXIS OF DA.W SECTION B-B SECT!OC*S Scale 0I. .,,~.* i... 50 i. ..', ¶.100'Feet I March 2001 Hiwassee 11 FIGURE 7 AXIS Traveling RPdiel Rat •514o.10-'. 2ZOO.0 OF DAM SECTION C-C 3cak 0 .. SECT0. ... NS ......... March 2000 Hiwassee 12 FIGURE 8 Hatch - - Cover I ' f/./• -5Z. - o Hw E llI53 '0 Gallery qoerat9fO~ -Ml/m W P 1450.0 SECTION D-D SECT•.OS kA 0 March 2000 Hiwassee 13 FIGURE 9 AXIS OF DAM 441,n "W C, 14,0O EI1312-0E.. 53. f;-ErtZ6Z tDISTR f,/2770 " ::---, W1 WIA 67 5.~ SECTION E-E OF DAM SECTtQNS 5caleu l ee March 2001 Hiwassee 14 FIGURE 10 OF DAM Roadway, E/l5375:A / 4 I "',W611526. S , .9 9 C U. 8"Formed 9 Orains V..- C. p * 9.1 IN * -~~1~ 9 I "Orivinea.V-". 9., . ° . -•.' P".d Goun /x Slope: lin OZ2 3" grout holes agt 5-O"to.c. AXIS OF DAM SECTION F-F SECTIS March 2001 Hiwassee 15 FIGURE 11 RESERVOIR AREA IN ACRES 0 1Q00 2000 3000 4000 5s000 6000 7000 sc 00 -J ) 100 ab00 40o so eGo 700 S1oo W1W) R FESERVOIR STORAGE CAPACITY >I IN THOUSANDS OF ACRE FEET z -a- Max.W.$S. (4753,--{ u01500 :"T;'. 1540Q. 0 ...... Lr rAna J r vw l flTh.. •T---:-•--1 1 ¸1 • •T---•D • .. •i -- •- • .• .. .1530Xý 51450 1 1 - T p I I -PAWN 1~300 . -. ý4 W. S - S - S - S - S - S - S - U - S S - I * - '0~O~U - I S~9-4. - laD cic" -1 Ir ,o 46400 1; [Iwo *. J --&-,..,. I .11290 Reg -- I.. .;.J j. ,,.-r4-4-- C4 4 -4-- 0 ConduitAs --- II. 0 Open -4-- ~-1~ Ac IL 1350 7- z-. .Z- I.151--- v,i0 -(01280 0. a C 0 -F'-....----I-" aO,',, Y Mzp-> 1270 I~~~~~~~~~~=I=I II=I= 0 Wt4SA±44 VT- --- ,lm l-, - 14 i- -: . I& {4-4M.t7# . -- SPILLWAY DISCHARGE IN THOUSANDS OF C f s <- > 0 20 40 so 80 100 1o20 140 6 G4 b 2k 16 TOb 24 28 S REGULATING CONDUIT DISCHARGE IN THOUSANDS OF cFr DI SCHARGE,AREA, CAPACITY, AND TAILWATER CURVES March 2001 Hiwassee 16 HIWASSEE PROJECT SUMMARY OF PRINCIPAL FEATURES NOTE: Elevations are based on the U.S.C. & G.S. 1929 Preliminary Adjustment to which the dam is built. To correct to U.S.C. & G.S. 1936 Supplementary Adjustment, subtract 0.62 ft. LOCATION On Hiwassee River at river mile 75.8; in Cherokee County, North Carolina; 13.6 miles upstream from Apalachia Station on Louisville and Nashville Railroad; 20 miles downstream from Murphy, North Carolina; 60 air miles south of Knoxville, Tennessee; 60 air miles east of Chattanooga, Tennessee; 100 air miles north of Atlanta, Georgia. CHRONOLOGY Authorized by TVA Board of Directors ....... .. January 10, 1936 Preliminary construction, including access, started .. ..... July 15, 1936 Stripping of south abutment started ........ .November 21, 1936 First cofferdam started ..................... ..... July 13, 1937 First concrete placed ...................... .... April 20, 1938 Reservoir clearance started ................ .. October 24, 1938 Last (third) cofferdam unwatered ........... ... January 3, 1939 River flow diverted through sluice ways .... .... April 22, 1939 Reservoir clearance completed .............. .December 12, 1939 Concreting by mixer plant completed ........ January 31, 1940 Dam closure (ring seal gates closed) ....... February 8, 1940 Unit 1 in commercial operation ...... ....... ...... May 21, 1940 Unit 2 authorized by TVA Board of Directors September 25, 1951 Unit 2 construction began .................. ... January 4, 1954 Unit 2 in commercial operation ............. ...... May 24, 1956 Reservoir releases improvements (Unit 1) - completed ..... December 1994 Generator and turbine modernization (Unit 2) - completed ................ .. December 4, 1998 March 2001 Hiwassee 17 PROJECT COST Initial project, including 1 unit ............. * $16,844,042 Addition of unit 2 ........................... * 6,356,211 Reservoir releases improvements (Unit 1) ..... ...... 40,000 Generator and turbine modernization (Unit 2). .. 14,224,012 Total, including switchyard ............. $37,464,265 STREAMFLOW Drainage area at dam: Total ............................................. ... 968 sq. miles Uncontrolled (below Chatuge and Nottely Dams) ..... .. ° 565 sq. miles Gaging station discharge records: At Hiwassee Dam, September 1934 to September 1943; drainage area ......................... ........... 968 sq. miles Below Appalachia Dam, North Carolina, June 1941 to April
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