11214540 HELMS POWERPLANT NEAR WISHON RESERVOIR, CA

LOCATION.-Lat 37°02'22", long 118°57'16", unsurveyed, T.10 S., R.28 E., Fresno County, Hydrologic Unit 18030010, Sierra National Forest, underground 
facility, 2.4 mi north of Wishon Dam, and 2.8 mi south of Courtright Dam. 
PERIOD OF RECORD.-October 1989 to current year. 
GAGE.-Acoustic-velocity meter in penstock. Elevation of powerplant, approximately 1,000 ft below land surface, is 6,286.0 ft above sea level (levels by Pacific 
Gas & Electric Co.) 
REMARKS.-Flow is diverted from Courtright Reservoir (station 11214550) through a tunnel to the powerplant which generates electricity during peak power demand, 
then to Wishon Reservoir (station 11214800). During periods of low power demand, reversible turbines pump water from Wishon Reservoir to Courtright Reservoir. 
Turbines draft up to 9,000 ft3/s and pump up to 7,200 ft3/s. Figures shown represent the net daily flow from Courtright Reservoir to Wishon 
Reservoir. Negative values represent net flow pumped to Courtright Reservoir. See schematic diagram of Kings River Basin. 
COOPERATION.-Records were provided by Pacific Gas & Electric Co., under general supervision of the U.S. Geological Survey, in connection with a Federal Energy 
Regulatory Commission project. 
EXTREMES FOR PERIOD OF RECORD.-Maximum daily discharge, 4,250 ft3/s, Nov. 1, 1991; maximum daily pumpage, 6,860 ft3/s, Jan. 5, 1997. 

                  DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998

                                               DAILY MEAN VALUES
DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
 
  1   -953.37      .00  -126.04      .00   -33.78   881.27   873.2   -459.29  -262.16  -275.78   296.45  1383.92
  2       .00   293.42   654.40      .00   942.27   217.80  -103.35 -1176.71  -990.67   300.48   -13.61  2488.53
  3       .00  1848.25  -599.45      .00    45.37    66.55   -44.87 -1594.15  -731.03  -616.59  1823.04  3049.66
  4       .00   596.92  -112.43   430.05  -673.56  1629.95  1682.88  -587.85  -859.09   135.11  1249.81   756.24
  5       .00    40.33  -524.33  1804.39   594.91  1087.98   286.87    68.06  -712.88   111.92  -116.96 -1303.76
  6       .00   -79.66  -353.42  1331.99  -316.61  1152.00  1584.07  1027.98  -997.23  2608.52   599.45  -651.88
  7       .00  -457.27  -783.97  1584.57  -312.58   960.93  -349.89  -514.24 -1335.52  1829.59 -1276.03  1746.91
  8       .00  -623.65   286.87   723.97  -797.08  -527.85   404.34  -368.04  -402.82  1033.02 -1568.44   823.80
  9       .00  -617.09  -254.10  1261.91  -418.96  1922.86  2573.73   367.03  -974.04   -89.24  -745.65   311.07
 10       .00  -118.98    83.69      .00  -361.48  1931.94  3109.15   129.57   260.15 -2410.89  1480.72  -315.10
 
 11       .00  -244.52  -434.59  -472.90   205.19  2406.86   672.55   665.99   194.10 -1304.76  1592.64  -893.37
 12       .00    68.06  -430.55    98.82  -237.96  1407.61 -1124.28   540.46  1284.60 -1322.41   833     -190.57
 13       .00  -442.65  -383.67    69.07  -449.21    -8.57  1359.72   702.29  -347.87  -829.85  1415.18  -578.27
 14       .00  -333.75  -426.52  -670.53   688.68   570.20   148.73   -83.19   -52.94 -1444.42  1190.32   205.70
 15       .00   -35.8   -267.71  -707.84   141.16   168.89  -202.67   430.55  2013.11 -1251.32  -957.90   459.29
 16       .00   251.58  -345.35 -1100.08  1468.62   854.05   548.53 -1581.55  1163.60  -162.34 -1498.87   881.77
 17       .00  1289.64  -400.30  -951.35   550.04  -158.31   970.51  -865.14  1273.51    72.09 -1323.42  1084.45
 18       .00   872.88  -207.71 -1858.84  -152.26  -299.47  -785.48  1738.85  1569.45  -955.38  -862.62   330.22
 19       .00   106.88  -187.55  -893.87   870.68  -698.76   -42.85   353.42  1380.89  -222.33  -131.08   978.07
 20       .00  -113.94      .00  -321.15   239.48 -1184.27   631.71   718.43   212.25    83.19   907.99  -312.58
 
 21       .00  -509.20  -225.36  -200.66    22.69 -1305.77  -256.62   624.65     8.07  -354.93   858.58   894.88
 22       .00  -442.65   196.62   843.46      .00 -1406.60    11.09  -304.01  -191.08   739.10  1618.86   701.29
 23       .00 -1031.51      .00   318.12   495.59 -1030.50   -16.64 -1074.87  -300.98   144.19  1591.13   807.66
 24       .00  -751.70      .00  -206.20   398.29 -1068.31  -986.64  -557.10   135.62   772.37  2190.07   388.20
 25       .00  -698.76  -364.51  -140.16  -222.33 -1063.78  -480.46 -1079.41   335.27   243.00  1957.65   -12.10
 26       .00  -703.81      .00   -66.55   204.69  -727.00  -394.76   489.03   330.73  -309.55   815.73 -2242.00
 27       .00  -790.02      .00    72.09   -45.88  -518.78  -364.51   669.52  1048.15   -83.69   401.81  -385.68
 28    789.01 -1500.88      .00   413.41   -62.01   -60.50   419.46   -57.98 -1984.88  -176.96   440.64    79.66
 29   1629.95 -1064.28      .00   118.48      --- -1033.53   575.25  -504.16 -1299.72  -272.75  -511.72   500.13
 30    740.11  -665.49      .00  1100.08      ---   400.30   289.89 -2234.94  -753.72  -201.16  -455.76   284.85
 31       .00      ---      .00   110.92      ---  1135.87      ---  -743.64      ---    74.62  1489.29      ---
 
TOTAL 2205.70 -5857.65 -5205.98  2691.20  2783.96  5703.06 10988.66 -5260.44  -987.13 -4137.15 13290.30 11270.99
MEAN     71.2     -195     -168     86.8     99.4      184      366     -170    -32.9     -133      429      376
MAX      1630     1850      654     1800     1470     2410     3110     1740     2010     2610     2190     3050
MIN      -953    -1500     -784    -1860     -797    -1410    -1120    -2230    -1980    -2410    -1570    -2240
AC-FT    4380   -11620   -10330     5340     5520    11310    21800   -10430    -1960    -8210    26360    22360
 


STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1989 - 1998, BY WATER YEAR (WY)                                 
  
DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
 
MEAN      148    -70.8     -.91    -42.1      108     57.3     94.8     -317    -33.3      177      301      379
MAX       499      247      220      245      433      371      370      194      242      627      429      894
(WY)     1996     1994     1989     1995     1989     1995     1995     1995     1992     1989     1998     1991
MIN      -110     -734     -203     -844    -84.6     -315     -311     -722     -239     -209      177     51.6
(WY)     1993     1992     1996     1997     1997     1989     1989     1992     1997     1997     1990     1990
 
SUMMARY STATISTICS           FOR 1997 CALENDAR YEAR        FOR 1998 WATER YEAR           WATER YEARS 1989 - 1998
 
ANNUAL TOTAL                      -35681.93                   27485.52                                          
ANNUAL MEAN                          -97.8                       75.3                       66.2                
HIGHEST ANNUAL MEAN                                                                        177              1995
LOWEST ANNUAL MEAN                                                                         -77.5            1997
  HIGHEST DAILY MEAN                  3450     Jan  1            3110     Apr 10            4250       Nov  1 1991
  LOWEST DAILY MEAN                  -6860     Jan  5           -2410     Jul 10           -6860       Jan  5 1997
  ANNUAL SEVEN-DAY MINIMUM           -2530     Jan  3           -1250     Jul 10           -2530       Jan  3 1997
ANNUAL RUNOFF (AC-FT)             -70780                      54520                      47940                  
10 PERCENT EXCEEDS                   999                       1290                       1150                  
50 PERCENT EXCEEDS                      .00                        .00                        .00               
90 PERCENT EXCEEDS                 -1050                       -979                       -933