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Show Report of the Regional Director St« George and Santa Clara Bench Irrigation Company, Santa Clara Field Canal Company, the St. George Clara Field Canal Company, the Shivwits Indian Reservation canals, and all other arable lands under these canals^ and (?) all other arable lands on Ivins Bench below the St# George and Santa Clara Bench Irrigation Company Canal and west of Volcanic Wash* Total acreage served in this division would be U,l50 acres, of which 1,565 acres are now irrigated and 2,585 acres are now lands. Of the lands now irrigated, about 75 percent is Class 1, and 25 percent is Class 2« Of the 2,535 acres of new lands, 36 percent is Class 1, 60 percent is Class 2, and the remaining U percent is Class 3 and Class h* Less than 100 acres of new land in the Santa Clara Division is public domain, Water Requirements 32o The average annual consumptive use requirement for crops grown in the Dixie Project area is estimated to be 3«0 acre-feet per acre. Diversion requirements differ slightly between the Hurricane Division and the Santa Clara Division, "because of differences in losses below the reservoirs, The annual diversion requirement, at the Virgin City Reservoir, for the Hurricane Division is estimated to be 4.5 acre-foot per acre, or a total requirement of 83,250 acrc-fc-ot. Average annual diversion requirements in the Santa Clare Division^ at points of diversion, id estineted at lj*5 acre-feat per acre, or a total of 18,675 acre-feet« Of this amount, 2,?U0 acre-foet would be supplied from return flow. Channel losses would be 1,135 acre-foot» The annual demand on Lower Gunlock Reser« voir is thus estimated to bo 17,120 acre-feet. Water Supply 33 • The average annual runoff of tho Virgin River at the Virgin City Damsite for the period 1925-1915 is 144,000 acre-foetr With the Virgin City Reservoir constructed as contemplated, the streamflow would be regulated to provide an annual yield of 125,000 acro-feet during the early years of project operation, diminishing to an annual yield of 115,000 acre-feeb after ^ years. Tho reduction in yield v/ould be brought about by tho accumulation of sediment in the reservoir* These yields would furnish a full water supply to all lands in the Hurricane Division without shortage, and would allow additional releases for .firm power production and downstream uses, 3h» The average annual runoff of the Santa Clara River is about 20,000 acre-feet* With the Lcwor Gunlock Roscrvoir |
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Original book: Utah exhibits [of the] State of Arizona, complainant, v. State of California, Palo Verde Irrigation District, Imperial Irrigation District, Coachella Valley County Water District, the Metropolitan Water District of Southern California, City of Los Angeles, City of San Diego, and County of San Diego, defendants, United States of America and State of Nevada, interveners, State of New Mexico and State of Utah, parties |