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<br /> Table 2. Upper Basin Runoff Areas <br /> Average Winter <br /> Area Size (October-April) <br />High Yield Mi2 , Precipitation <br />Runoff Areas km" In. mm States <br />Upper Green 1,050 2 720 23.0 584 Wyoming <br />(Wind River) <br />Uinta 2,250 5 830 20.5 521 Utah-Wyoming <br />Yampa 1,450 3 760 23.5 597 Colorado- <br />(Park Range) Wyoming <br />Central 6,150 15 930 21.6 549 Colorado <br />Colorado <br />San Juan 3,300 8 550 24.1 612 Colorado- <br /> - Hew Mexico <br />Upper Basin <br />(Total) 14,200 36 790 22.5(Avg. ) 572 (Avg.) <br /> <br />The Mogollon Rim is the major runoff-producing area in the Lower <br />Colorado River Basin. This massif, with a 18 943-km2 (7,314 mi2) <br />has precipitation-runoff relationships in which approximately <br />178 mm (7 in.) of precipitation are lost before substantial <br />surface runoff occurs. Precipitation and runoff quantitites are <br />relatively low in this area and a threshold value of precipitation <br />must first be exceeded to improve on the "base flow" runoff of <br />5 or 8 mm (0.2 or 0.3 in.) over the massif area. <br /> <br />Three well-documented studies have estimated the average annual <br />water augmentation potential for precipitation management in the <br />Upper Colorado River Basin: <br /> <br /> Acre-ft 106m3 <br />Bureau of Reclamation 1967-68 Study 1,870,000 2307 <br />Stanford Research Institute 1971-72 Study 2,300,000 2837 <br />North American Weather 1972-73 Study 1,315,000 1622 <br />Consultants (Twelve <br />Basin Study) <br /> <br />111-2 <br />