2017-Discharge-Report

Table 2. Estimated Spring Discharge from the Edwards Aquifer, 2017 (measured in acre-feet).

Leona Springs and Leona River Underflow

Total Monthly Discharge from Springs

San Pedro Springs

San Antonio Springs

San Marcos Springs

Comal Springs

Hueco Springs

Month

January February March

2.120 1,790 1,970 2,160 1,950 1,910 1,370 1,190 1,260 1,840 1,840 2,060

760 730 870 640 390 312 92 108 122 201 152 198

5,460 5,020 5,770 3,420 763 415

24,100 23,000 25,500 24,500 23,400 20,700 17,900 16,600 16,900 18,000 17,600 17,800

5,300 4,800 5,960 5,070 4,400 2,990 2,500 2,390 1,970 1,570 1,190 1,430

13,900 13,100 14,700 16,200 16,600 14,400 12,500 11,400 13,600 12,500 11,100 10,600

51,700 48,500 54,800 51,900 47,500 40,700 34,300 31,700 33,900 34,000 31,800 32,100

April May June July

0 0 0 0 0 0

August

September October November December

Total

21,500

4,570

20,800

246,000 39,600

161,000

493,000

Data source: USGS unpublished report (2017). Totals might not equal sum of discharge values as a result of rounding.

Comal Springs Annual Mean Flow Compared to Historical Mean Flow for Period of Record from 1933-2017

500

450

400

350

300

250

200

Historical Mean Flow for Period of Record (286 cfs)

Annual Mean Flow for 2017 (286 cfs)

150

Mean Annual Flow in cfs

100

50

0

1933

1935

1937

1939

1941

1943

1945

1947

1949

1951

1953

1955

1957

1959

1961

1963

1965

1967

1969

1971

1973

1975

1977

1979

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

2013

2015

2017

Year

Figure 2. Mean Annual Discharge at Comal Springs

6

E DWARD S AQU I F E R AU THOR I T Y