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<br /> <br />o <br />, .) <br />-'.J <br />r.n <br />r<1 <br />Co! <br /> <br />Utah <br />Grazing area <br />Average elevation <br />Total runoff <br /> <br />30, 330 sq. mi. <br />6,499 feet <br />323 , 000 acre feet <br /> <br />This :l,'unoff is estimated to be 125% of that prevailing before man's activities <br />in the Basin, which amounts to an increase of 64.600 acre feet annually. <br /> <br />New Mexico <br />Grazing area 9,496 sq. mi. <br />Average elevation 6,499 feet <br />Total runoff 257,000 acre feet <br /> <br />This runoff is estimated to be 125% of that prevailing before man's activities <br />in the Basin.. which amounts to an increase of 51,400 acre feet annually. <br /> <br />Arizona <br />Grazing area 6. 896 sq. mi. <br />Aver.ageelevation 6.174 feet <br />Total runoff 73. 000 acre feet <br /> <br />This r~off is estimated to be 125% of that prevailing before man's activities <br />in the ];lasin. which amounts to an increase of 14, 600 acre feet annually. <br /> <br />SUMMARY OF INCREASED RUNOFF DUE TO ACTIVITIES <br />OF MAN <br /> <br />Increased Runoff (Acre feet) <br /> <br />State <br /> <br />National <br />Forests <br /> <br />Depletion of <br />Deforestation Grazing Land Total <br /> <br />Arizona: ------- -------- 14,600 14,600 <br />Colorado 393, 000 64, 000 568, 000 1. 02!l, 000 <br />New MeXico 500 700 51. 400 52, 600 <br />Utah 83, 000 8, 000 64, 600 1 55, 600 <br />Wyoming 31.000 1,900 242,000 274,900 <br />Total 507, 500 74 ,600 940, 600 1, 522. 700 <br /> <br />SUMMARY OF UPPER COLORADO BASIN SHOWING <br />.. DEPLETIONS AND ADDITIONS TO STREAM FLOW <br />IN A STATE OF NATURE ON THE FIRST CONCEPT <br />OF MAN'S ACTIVITIES (ACRE FEET) <br /> <br />State <br />- <br /> <br />Engineering Advisory Commission's <br />Estimate Vrater Consumed in irriga- <br />tion of land Exclusive Trans-mountain <br />. Diversions <br /> <br />Based on Gove:rnment <br />Sxperiments -l11creas ed <br />Runoff Due to Overgrazing. <br />Timber Cutting, etc. <br /> <br />14. 600 <br />1, 025. 000 <br />52.600 <br />1 55. 600 <br />2 74. 900 <br />1. 522, 700 <br /> <br />J\,:l,'izona 3, 900 <br />Colorado 1. 000,040 <br />New Mexico n,167 <br />Utah 465,044 <br />Wyoming 224,370 <br />Total 1, 764, 521 <br /> -12- <br />