Deep Groundwater Conditions Report - Westlands Water District

Groundwater elevations and the estimated amount of groundwater pumped from last sixtyyears are shown in Table 2. This table shows the average elevation of the groundwater in the lowerwater bearing zone and the change in elevation for each year.ElevationChangeFTElevationChangeFTCrop 6 Pumped ElevationCrop Pumped ElevationYear AF FTYear AF FT1951 840,000 -9 1981 99,000 11 71952 1,000,000 1982 105,000 32 211953 952,000 -35 1983 31,000 56 241954 852,000 1984 73,000 61 51955 904,000 -52 1985 228,000 63 21956 964,000 -65 -13 1986 145,000 71 81957 928,000 -56 9 1987 159,000 89 181958 884,000 -29 27 1988 160,000 64 -251959 912,000 -77 -48 1989 175,000 63 -11960 872,000 -81 -4 1990 300,000 9 -541961 824,000 -96 -15 1991 600,000 -32 -411962 920,000 1992 600,000 -62 -301963 883,000 1993 225,000 1 631964 913,000 1994 325,000 -51 -521965 822,000 1995 150,000 27 781966 924,000 -134 1996 50,000 49 221967 875,000 -156 -22 1997 30,000 63 141968 596,000 -135 21 1998 15,000 63 01969 592,000 -120 15 1999 20,000 65 21970 460,000 -100 20 2000 225,000 43 -221971 377,000 -93 7 2001 215,000 25 -181972 -54 39 2002 205,000 22 -31973 -37 17 2003 160,000 30 81974 96,000 -22 15 2004 210,000 24 -61975 111,000 -11 11 2005 75,000 56 321976 97,000 -2 9 2006 15,000 77 211977 472,000 -99 -97 2007 310,000 35 -421978 159,000 -4 95 2008 460,000 -11 -461979 140,000 -13 -9 2009 480,000 -31 -201980 106,000 4 17 2010 140,000 9 40Table 2: 60-years of estimated groundwater pumpage. 76Crop year is from 1 October (previous year) to 30 September (current year) for the year in question.7Data compiled from PG&E power records by USBR through 1971 and USGS 1974-1987, District estimates 1988-present. Elevation data for 1943-1961 and 1977 from Bill Coor, USBR (requested by the District and received on4/20/1978) and elevation for 1966-1976 from Plate 5 of “Project Effects on Sub-Corcoran Water Layers” (April 1977).10