Using the data in Tables 2.4.1 and 2.4.2 develop a curve of the cumulative recharge and the cumulative discharge from the Edwards Aquifer as a function of time for the period 1980–2001. Discuss the results.
Table 2.4.1 Estimated Annual Recharge to the Edwards Aquifer by Basin, 1980–2001 (thousands of ac-ft)
Calendar year | Nueces–West Nueces River Basin | Frio-Dry Frio River Basin1 | Sabinal River Basin1 | Area between Sabinal and Medina River Basins1 | Medina River Basin2 | Area between Medina River Basin and Cibolo–Dry Comal Creek Basin1 | Cibolo Creek and Dry Comal Creek Basins | Blanco River Basin1 | Total3 |
1980 | 58.6 | 85.6 | 42.6 | 25.3 | 88.3 | 18.8 | 55.4 | 31.8 | 406.4 |
1981 | 205.0 | 365.2 | 105.6 | 252.1 | 91.3 | 165.0 | 196.8 | 67.3 | 1448.4 |
1982 | 19.4 | 123.4 | 21.0 | 90.9 | 76.8 | 22.6 | 44.8 | 23.5 | 422.4 |
1983 | 79.2 | 85.9 | 20.1 | 42.9 | 74.4 | 31.9 | 62.5 | 23.2 | 420.1 |
1984 | 32.4 | 40.4 | 8.8 | 18.1 | 43.9 | 11.3 | 16.9 | 25.9 | 197.9 |
1985 | 105.9 | 186.9 | 50.7 | 148.5 | 64.7 | Í36.7 | 259.2 | 50.7 | 1003.3 |
1986 | 188.4 | 192.8 | 42.2 | 173.6 | 74.7 | 170.2 | 267.4 | 44.5 | 1153.7 |
1987 | 308.5 | 473.3 | 110.7 | 405.5 | 90.4 | 229.3 | 270.9 | 114.9 | 2003.6 |
1988 | 59.2 | 117.9 | 17.0 | 24.9 | 69.9 | 12.6 | 28.5 | 25.5 | 355.5 |
1989 | 52.6 | 52.6 | 8.4 | 13.5 | 46.9 | 4.6 | 12.3 | 23.6 | 214.4 |
1990 | 479.3 | 255.0 | 54.6 | 131.2 | 54.0 | 35.9 | 71.8 | 41.3 | 1123.2 |
1991 | 325.2 | 421.0 | 103.1 | 315.2 | 52.8 | 84.5 | 109.7 | 96.9 | 1508.4 |
1992 | 234.1 | 586.9 | 201.1 | 566.1 | 91.4 | 290.6 | 286.6 | 228.9 | 2485.7 |
1993 | 32.6 | 78.5 | 29.6 | 60.8 | 78.5 | 38.9 | 90.9 | 37.8 | 447.6 |
1994 | 124.6 | 151.5 | 29.5 | 45.1 | 61.1 | 34.1 | 55.6 | 36.6 | 538.1 |
1995 | 107.1 | 147.6 | 34.7 | 62.4 | 61.7 | 36.2 | 51.1 | 30.6 | 531.3 |
1996 | 130.0 | 92.0 | 11.4 | 9.4 | 42.3 | 10.6 | 14.7 | 13.9 | 324.3 |
1997 | 176.9 | 209.1 | 57.0 | 208.4 | 63.3 | 193.4 | 144.2 | 82.3 | 1134.6 |
1998 | 141.5 | 214.8 | 72.5 | 201.4 | 80.3 | 86.2 | 240.9 | 104.7 | 1142.3 |
1999 | 101.4 | 136.8 | 30.8 | 57.2 | 77.1 | 21.2 | 27.9 | 21.0 | 473.5 |
2000 | 238.4 | 123.0 | 33.1 | 55.2 | 53.4 | 28.6 | 48.6 | 34.1 | 614.5 |
2001 | 297.5 | 126.7 | 66.2 | 124.1 | 90.0 | 101.5 | 173.7 | 89.7 | 1069.4 |
Average | 121.2 | 134.1 | 42.2 | 107.2 | 61.9 | 69.9 | 105.0 | 43.1 | 684.7 |
1Includes recharge from ungaged areas.
2Recharge to Edwards Aquifer from the Medina River Basin consists entirely of losses from Medina Lake (Puente, 1978).
3Total might not equal the sum of basin values due to rounding.
Source: Slattery and Thomas (2002).
Table 2.4.2 Estimated Annual Discharge from the Edwards Aquifer by County, 1986–2001 (thousands of ac-ft)
Calendar year | Kinney-Uvalde Counties | Medina County | Bexar County | Comal County | Hays County | Total1 | Well discharge | Spring discharge |
1980 | 151.0 | 39.9 | 300.3 | 220.3 | 107.9 | 819.4 | 491.1 | 328.3 |
1981 | 104.2 | 26.1 | 280.7 | 241.8 | 141.6 | 794.4 | 387.1 | 407.3 |
1982 | 129.2 | 33.4 | 305.1 | 213.2 | 105.5 | 786.4 | 453.1 | 333.3 |
1983 | 107.7 | 29.7 | 277.6 | 186.6 | 118.5 | 720.1 | 418.5 | 301.6 |
1984 | 151.1 | 46.9 | 309.7 | 108.9 | 85.7 | 702.3 | 529.8 | 172.5 |
1985 | 156.9 | 59.2 | 295.5 | 200.0 | 144.9 | 856.5 | 522.5 | 334.0 |
1986 | 91.72 | 41.9 | 294.0 | 229.3 | 160.4 | 817.32 | 429.3 | 388.12 |
1987 | 95.12 | 15.9 | 326.6 | 286.2 | 198.4 | 922.02 | 364.1 | 558.02 |
1988 | 156.72 | 82.2 | 317.4 | 236.5 | 116.9 | 909.72 | 540.0 | 369.82 |
1989 | 156.9 | 70.5 | 305.6 | 147.9 | 85.6 | 766.6 | 542.4 | 224.1 |
1990 | 118.1 | 69.7 | 276.8 | 171.3 | 94.1 | 730.0 | 489.4 | 240.6 |
1991 | 76.6 | 25.6 | 315.5 | 221.9 | 151.0 | 790.6 | 436.3 | 354.3 |
1992 | 76.5 | 9.3 | 370.5 | 412.4 | 261.3 | 1,130.2 | 327.3 | 802.8 |
1993 | 107.5 | 17.8 | 371.0 | 349.5 | 151.0 | 996.7 | 407.3 | 589.4 |
1994 | 95.5 | 41.1 | 297.7 | 269.8 | 110.6 | 814.8 | 424.6 | 390.2 |
1995 | 90.8 | 35.2 | 272.1 | 235.0 | 127.8 | 761.0 | 399.6 | 361.3 |
1996 | 117.6 | 66.3 | 286.8 | 150.2 | 84.7 | 705.6 | 493.6 | 212.0 |
1997 | 29.93 | 7.03 | 255.33 | 243.3 | 149.2 | 684.73 | 300.73 | 384.0 |
1998 | 113.1 | 51.3 | 312.8 | 271.4 | 169.2 | 915.9 | 451.7 | 464.1 |
19994 | 99.85 | 48.3 | 298.3 | 295.2 | 142.3 | 884.0 | 427.8 | 456.2 |
2000 | 89.1 | 45.1 | 283.6 | 226.1 | 108.4 | 752.3 | 414.8 | 337.5 |
2001 | 68.7 | 33.9 | 291.6 | 327.4 | 175.3 | 896.9 | 367.7 | 529.1 |
1Total might not equal the sum of county values due to rounding.
2Differs from value to the Edwards Underground Water District Bulletins, pp. 46–48, table 3, due to correction of an error in the method of computing the Leona Formation underflow.
3Does not include irrigation discharge (Bexar, Medina, and Uvalde Counties).
4Does not include discharge for domestic supply, stock, and miscellaneous use.
5Does not include discharge from Kinney County.
Source: Slattery and Thomas (2002).
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