Table 2. Estimated
annual discharge from the Edwards aquifer by county, 1934–99
[thousands of acre-feet]
|
Calendar |
Kinney |
Medina |
Bexar |
Comal |
Hays |
Total1 |
Well |
Spring |
|
1934 |
12.6 |
1.3 |
109.3 |
229.1 |
85.6 |
437.9 |
101.9 |
336.0 |
|
1935 |
12.2 |
1.5 |
171.8 |
237.2 |
96.9 |
519.6 |
103.7 |
415.9 |
|
1936 |
26.6 |
1.5 |
215.2 |
261.7 |
93.2 |
598.2 |
112.7 |
485.5 |
|
1937 |
28.3 |
1.5 |
201.8 |
252.5 |
87.1 |
571.2 |
120.2 |
451.0 |
|
1938 |
25.2 |
1.6 |
187.6 |
250.0 |
93.4 |
557.8 |
120.1 |
437.7 |
|
1939 |
18.2 |
1.6 |
122.5 |
219.4 |
71.1 |
432.8 |
118.9 |
313.9 |
|
1940 |
16.1 |
1.6 |
116.7 |
203.8 |
78.4 |
416.6 |
120.1 |
296.5 |
|
1941 |
17.9 |
1.6 |
197.4 |
250.0 |
134.3 |
601.2 |
136.8 |
464.4 |
|
1942 |
22.5 |
1.7 |
203.2 |
255.1 |
112.2 |
594.7 |
144.6 |
450.1 |
|
1943 |
19.2 |
1.7 |
172.0 |
249.2 |
97.2 |
539.3 |
149.1 |
390.2 |
|
1944 |
11.6 |
1.7 |
166.3 |
252.5 |
135.3 |
567.4 |
147.3 |
420.1 |
|
1945 |
12.4 |
1.7 |
199.8 |
263.1 |
137.8 |
614.8 |
153.3 |
461.5 |
|
1946 |
6.2 |
1.7 |
180.1 |
261.9 |
134.0 |
583.9 |
155.0 |
428.9 |
|
1947 |
13.8 |
2.0 |
193.3 |
256.8 |
127.6 |
593.5 |
167.0 |
426.5 |
|
1948 |
9.2 |
1.9 |
159.2 |
203.0 |
77.3 |
450.6 |
168.7 |
281.9 |
|
1949 |
13.2 |
2.0 |
165.3 |
209.5 |
89.8 |
479.8 |
179.4 |
300.4 |
|
1950 |
17.8 |
2.2 |
177.3 |
191.1 |
78.3 |
466.7 |
193.8 |
272.9 |
|
1951 |
16.9 |
2.2 |
186.9 |
150.5 |
69.1 |
425.6 |
209.7 |
215.9 |
|
1952 |
22.7 |
3.1 |
187.1 |
133.2 |
78.8 |
424.9 |
215.4 |
209.5 |
|
1953 |
27.5 |
4.0 |
193.7 |
141.7 |
101.4 |
468.3 |
229.8 |
238.5 |
|
1954 |
26.6 |
6.3 |
208.9 |
101.0 |
81.5 |
424.3 |
246.2 |
178.1 |
|
1955 |
28.3 |
11.1 |
215.2 |
70.1 |
64.1 |
388.8 |
261.0 |
127.8 |
|
1956 |
59.6 |
17.7 |
229.6 |
33.6 |
50.4 |
390.9 |
321.1 |
69.8 |
|
1957 |
29.0 |
11.9 |
189.4 |
113.2 |
113.0 |
456.5 |
237.3 |
219.2 |
|
1958 |
23.7 |
6.6 |
199.5 |
231.8 |
155.9 |
617.5 |
219.3 |
398.2 |
|
1959 |
43.0 |
8.3 |
217.5 |
231.7 |
118.5 |
619.0 |
234.5 |
384.5 |
|
1960 |
53.7 |
7.6 |
215.4 |
235.2 |
143.5 |
655.4 |
227.1 |
428.3 |
|
1961 |
56.5 |
6.4 |
230.3 |
249.5 |
140.8 |
683.5 |
228.2 |
455.3 |
|
1962 |
64.6 |
8.1 |
220.0 |
197.5 |
98.8 |
589.0 |
267.9 |
321.1 |
|
1963 |
51.4 |
9.7 |
217.3 |
155.7 |
81.9 |
516.0 |
276.4 |
239.6 |
|
1964 |
49.3 |
8.6 |
201.0 |
141.8 |
73.3 |
474.0 |
260.2 |
213.8 |
|
1965 |
46.8 |
10.0 |
201.1 |
194.7 |
126.3 |
578.9 |
256.1 |
322.8 |
|
1966 |
48.5 |
10.4 |
198.0 |
198.9 |
115.4 |
571.2 |
255.9 |
315.3 |
|
1967 |
81.1 |
15.2 |
239.7 |
139.1 |
82.3 |
557.4 |
341.3 |
216.1 |
|
1968 |
58.0 |
9.9 |
207.1 |
238.2 |
146.8 |
660.0 |
251.7 |
408.3 |
|
1969 |
88.5 |
13.6 |
216.3 |
218.2 |
122.1 |
658.7 |
307.5 |
351.2 |
|
1970 |
100.9 |
16.5 |
230.6 |
229.2 |
149.9 |
727.1 |
329.4 |
397.7 |
|
1971 |
117.0 |
32.4 |
262.8 |
168.2 |
99.1 |
679.5 |
406.8 |
272.7 |
|
1972 |
112.6 |
28.8 |
247.7 |
234.3 |
123.7 |
747.1 |
371.3 |
375.8 |
|
1973 |
96.5 |
14.9 |
273.0 |
289.3 |
164.3 |
838.0 |
310.4 |
527.6 |
|
1974 |
133.3 |
28.6 |
272.1 |
286.1 |
141.1 |
861.2 |
377.4 |
483.8 |
|
1975 |
112.0 |
22.6 |
259.0 |
296.0 |
178.6 |
868.2 |
327.8 |
540.4 |
|
1976 |
136.4 |
19.4 |
253.2 |
279.7 |
164.7 |
853.4 |
349.5 |
503.9 |
|
1977 |
156.5 |
19.9 |
317.5 |
295.0 |
172.0 |
960.9 |
380.6 |
580.3 |
|
1978 |
154.3 |
38.7 |
269.5 |
245.7 |
99.1 |
807.3 |
431.8 |
375.5 |
|
1979 |
130.1 |
32.9 |
294.5 |
300.0 |
157.0 |
914.5 |
391.5 |
523.0 |
|
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 |
291.7 |
41.9 |
294.0 |
229.3 |
160.4 |
2817.3 |
429.3 |
2388.1 |
|
1987 |
295.1 |
15.9 |
326.6 |
286.2 |
198.4 |
2922.0 |
364.1 |
2558.0 |
|
1988 |
2156.7 |
82.2 |
317.4 |
236.5 |
116.9 |
2909.7 |
540.0 |
2369.8 |
|
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 |
329.9 |
37.0 |
3255.3 |
243.3 |
149.2 |
3684.7 |
3300.7 |
384.0 |
|
1998 |
113.1 |
51.3 |
312.8 |
271.4 |
169.2 |
915.9 |
451.7 |
464.1 |
|
41999 |
599.8 |
48.3 |
298.3 |
295.2 |
142.3 |
884.0 |
427.8 |
456.2 |
1 Total might not equal sum of county values due to rounding.
2 Differs from value in Edwards Underground Water District
Bulletins 46–48, table 3, due to correction of an error in the method of computing
the Leona Formation underflow.
3 Does not include irrigation discharge (Bexar, Medina, and
Uvalde Counties).
4 Does not include discharges for domestic supply, stock, and
miscellaneous use.
5 Does not include discharge from Kinney County.