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Contents 1'11e rand................................................................ Sunnnary.......................................................... . The water supply..............."""""""""".".."."""...."."""""""""".."."." Flow of Rio Grarlde""".""""""""."""""."."""""..""""""""""."""..".""." Distribution of flow....................... ......................... of of of Rio Grande water............ U. S. share Probability Persistence ......................... recurrence of low flows......... ..................... low flow.""".""".".....""".."""..".". ............... Rainfall.".""""."""...""""..""""".""""""."""""""""".".""."."""""."" " Evaporation." " "" "" " . "". . " """ " . " "" "" " " . . . . . . . . . . . . . . . . . . . . . . .. . . Ground-water. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SUIl'lIl1.8.ry....... .................................................. Water use................................................................ Domestic requirements............................................... Water needs..................................................... Water use per acre.................................................. Water balance....................................................... Water use efficiency................................................ S1.llDIl1B.ry........................... ...... ................. ... ........ Water allocation............................................... -. . . . .... . . Pl1;y"sica1 solution........................................................ All acres share equally............................ ._................ Pr'iori ties recognized............................................. Estimate of next yearls water supply................................ Waste of water.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Specific solutions.................................................. SUIl'lIl1.8.ry............................................................ . Table Tables l 2 u. S. Acreage receiving water from the Rio Grande.............. Number of allottees and acreages by size, by river reaches, and by counties................................................ Classification of allottees.................................... 3 4 5 6 7 8 9 lO II l2 l3 l4 l5 l6 l7 l8 19 District data.................................................. 1901-64. . 1932-63..... Annual discharge, Rio Grande at Rio Grande City, Tex. Distribution of flaw, Rio Grande at Laredo, Texas, Percent of flaw by months, Rio Grande at Laredo, Texas......... U. S. share, Rio Grande at Falcon, Pro babili ty of recurrence of annual flaws, Probability of recurrence of annual flaws, 1945-64............. Chance of occurrence of selected discharges.................... Minimum flow for consecutive years, 1900-64.................... Water use in Lower Rio Grande Valley........................... u. S. releases, diversions, and flow to Gulf................... Water use efficiency...................................... Time annual flow above selected amount..................... Irrigated acreage for selected allocations.................. Water supply allotted equally Water supply allotted equally 1900-64.................... . 1900-64............. each year........................ each year but limited to 2.50 acre-feet per acre............................................. 30 '1' f'"'r l,' 1.-' .' '" "''-'....v v Page 2 3 5 5 8 lO l2 l5. l6 17 l7 l8 19 19 20 2l 2l 24 24 25 28 28 30 36 36 36 36 2 4 5 6 7 8 9 II l3 l4 l4 l6 22 23 24 26 27 29