GALVESTON INFLOWS


Galveston Bay and the Trinity-San Jacinto Estuary Historical (1941-1990) Freshwater Inflows and TxEMP Model Solutions (in Acre-Feet)
Month Hist-Min 10th % MinQ-Sal MinQ MaxH Median Average 90th % Hist-Max
J 41,630 150,485 150,490 150,500 150,500 699,490 900,903 2,090,450 2,858,000
F 70,990 155,190 216,700 216,700 155,200 946,475 929,369 1,865,649 2,577,000
M 73,530 164,399 363,900 363,900 652,800 652,800 927,065 1,982,064 2,729,000
A 136,200 193,935 267,270 352,600 632,500 632,500 1,038,525 2,388,805 5,290,000
M 139,400 260,000 309,970 679,700 1,273,700 1,273,700 1,522,301 3,616,000 4,571,000
J 56,540 190,324 413,560 448,100 839,700 839,700 1,218,681 3,222,000 4,011,820
J 44,350 107,705 211,500 232,700 211,500 340,376 632,396 1,559,200 2,439,189
A 20,590 77,980 140,000 154,000 140,000 225,265 379,458 754,760 2,110,600
S 15,740 93,325 102,960 330,200 103,000 330,246 533,187 1,466,565 2,484,919
O 21,100 49,885 78,600 251,900 78,600 251,895 538,943 1,476,164 3,590,900
N 31,300 89,480 164,390 351,500 351,500 351,500 651,704 1,740,750 4,565,000
D 55,290 93,865 93,870 626,800 626,800 626,802 768,678 1,812,163 2,582,000
Total Q 706,660 1,626,573 2,513,210 4,158,600 5,215,800 7,170,749 10,041,210 23,974,570 39,809,428
Year (1956)               (1973)
Annual Q 1,871,280               21,454,740



Distribution and Potential Changes in Estuary InFlows
 
Average Contribution of Inflowing
River and Coastal Basins
      1941-1990
Source     Inflow Q
  (abbrev.)   (ac-ft/yr) (% of inflow)
Trinity River T   5,422,253 54
San Jacinto River SJ   2,811,539 28
San Jacinto-Brazos SJ-B   1,004,121 10
Neches-Trinity N-T   602,473 6
Trinity-San Jacinto T-SJ   200,824 2
Total     10,041,209 100
 
Potential Future East-West Water Diversions
Customer Source   Divert Q Divert Q Return Q Return Q
    (remarks) (ac-ft/yr) (% of inflow) (ac-ft/yr) (% of inflow)
City of Houston TRB Certif. No. 4261 944,400 9.41 566,640 5.64
San Jacinto River Authority TRB Devers Canal 50,000 0.50 30,000 0.30
San Jacinto River Authority SRB Trans-Texas 672,086 6.69 403,252 4.02
Total     1,666,486 16.60 999,892 9.96
TRB = Trinity River Basin
SRB = Sabine River Basin