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Show 40 PROBLEMS OF IMPERIAL VALLEY AND VICINITY. rate of increase of 50,000 acres per year, so that storage which might be developed under this plan may take care of the situation for only 15 years. (2) To provide the maximum storage which will be needed for ultimate irrigation development if no power reservoirs are built in the canyon region. (3) To provide for complete regulation of the river with the idea that surplus water be used to develop power at Boulder Canyon and that later as development above decreases the discharge available, release for power will be decreased. To compensate for decrease in release for power there will be less capacity in the reservoir which must be reserved for storage and consequently more head available for power. This works out satisfactorily, especially if the Boulder Canyon plant is tied in with one above where discharge can be regulated according to power needs. PLAN 1. MINIMUM STORAGE; DEVELOPMENT. Aqres. Upper basin-additional acreage..___.................................. 1,008,000 Lower basin:1 Present acreage......................................... 698, 000 Additional acreage.....................................710,000 ---------- 1,408,000 Total..............?............................................ 2,416,000 Table No. 13.-Estimated demand for most feasible acreage. [Acre-feet. Based on 5 feet duty for lower basin because of no necessity for economy.] January... February. March___ April..... May..... June...... July..... Lower basin, 1,408,000 acres. 260,000 200,000 Upper basin, 1,008,000 acres total.2 610,000 670,000 680,000 870,000 870,000 80,000 380,000 400,000 320,000 Total. 260,000 200,000 610,000 750,000 1,060,000 1,270,000 1,190,000 August......... September..... October........ November..... December...... Total..... Lower basin, 1,408,000 acres. 800,000 730,000 450,000 380,000 Upper basin, 1,008,000 acres total.2 160,000 160,000 80,000 110,000 6,630,000 | 1,580,000 Total. 960,000 890,000 530,000 380,000 110,000 8,210,000 Table No. 14.-Storage required for most feasible acreage neglecting evaporation from reservoir. Acre-feet. 1899........................ 460,000 1900........................ 1,660, 000 1901........................ 1,410,000 1902........................ 2,340,000 1903........................ 1,010,000 1904......................... 440,000 1905..........."....:........ 980,000 1906........................ 250,000 1907.................................. 1908........................ 290,000 1909.................................. 1910. 1911. 1912. 1913'. 1914. 1915. 1916. 1917. 1918. 1919. 1920. Acre-feet. 410,000 380,000 330,000 810,000 320, 000 ,000, 000 200,000 370,000 770,000 ,030, 000 460,000 1 Consists of those items shown as "feasible now'' [n Table 3, p..32. * Assumed that withdrawals for storage balance return flow out of irrigation season. |