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. ..... I'.:! ... .::.. . . HISTORY OF WATER RESOURCE DEVELOPME~T Water exported from the Upper Basin during the period 1941-70 averaged about 360.000 acre-feet per year. Completion of the large projects such as the COlorado-Big Thompson, Duchesne Tunnel, Roberts Tunnel, and the more recent projects such as the San Juan-Chama Fryingpan-Arkansas. and Homestake resulted in increased diversions to about 690,000 acre-feet in 1973. Reservoir evaporation varies from year-co-year but the variations have little effect on average streamflow depletions. For the period of record considered. average reservoir evaporation in the Upper Basin was not large until about 1963 when the Colorado River Storage Project Res- ervoir started to store .....ater. In 1973 about 569.000 acre-feet .....ere evaporated from the reservoirs and about 638.000 in 1974. Under normal operating conditions, evaporation from the Colorado River Storage Project reservoirs is expected to average about 568,000 acre-feet annually. In the lo.....er basin. .....ater is diverted to municipal and industrial projects and to irrigation districts. These M&I projects include the Southern Nevada Water Project .....hich diverts .....ater from Lake Mead above Hoover Dam. and the Metropolitan Water District .....hich diverts .....ater from above Parker Dam and exports it to the Southern California coastal areas. Belo..... Parker Dam .....ater is diverted for irrigation to the Colorado River Indian Reservation and to the Palo Verde Irrigation District. At Imperial Dam the .....ater is divided into three parts. On the left bank. it goes to the Gila and Yuma Projects. on the right bank. it goes to the Imperial and Coachella .....ater districts through the All American canal. .....ith the remaining .....ater going to Mexico. Bela..... the Imperial Dam. .....ater is delivered to Mexico as required by the treaty with Mexico. There is essentially no flo..... belo..... Morelos Diversion Dam except for the bypassed saline flo.....s from the Wellton-Moha.....k Drain Extension. C. Legal Aspects. Water Quantitv 1. Colorado River Compact Water of the Colorado River .....as divided bet.....een the Upper and Lo_er Colorado River Basins by the Colorado River Compact .....hich .....as signed in 1922 by a commissioner of each of the seven States of the river basin and by a representative of the United States. All States but Arizona ratified the compact prior to its effective date in 1929. The dividing point on the river bet.....een the Upper and Lo.....er Basins is at Lee Ferry .....hich is defined as a point 1 mile belo..... the mouth of the Paria River. (Not to be confused .....ith Lees Ferry .....hich is the site of the gaging station just above the Paria River.) The compact apportions from the Colorado River system to each of the Upper and Lo.....er Basins in perpetu- ity for exclusive beneficial consumptive use, a total of 7.500.000 acre- feet annually. In addition to the apportioD.::lent of 7.500,000 acre-feet. 11