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<br />001254 <br /> <br />CHAPTER IV <br /> <br />IMPROVEMENT AND EXTENSION <br /> <br />. <br /> <br />The plamled capacity of Dominguez Lake and the potential capacity <br />of Gibbl~r Reservoir could provide for a pumped storage development <br />with a capacity of several million kilowatts. The development would <br />be adaptable to construction by stages. <br /> <br />With stage development, it would probably be desirable to con- <br />struct Gibbler Reservoir to its ultimate capacity at the time of <br />construction of the first inter-reservoir tunnel and pumping-generating <br />units. Additional tunnels and pumping-generating units could be added <br />as needed. The proper capacities and times for development for each <br />stage and for ultimate development would depend on analysis of several <br />factors. These factors include: the determination of the most econom- <br />ical sizes of pumping-generating equipment; the future pattern of <br />availability of large amounts of off-peak power at reasonable costs; <br />the location, size, timing, and demand pattern of peaking power markets; <br />and, the availability and time of construction of electrical transmission <br />capacity to market areas. <br /> <br />Irrigation Service Area <br /> <br />. <br /> <br />In the present investigation of the improvement plan it has been <br />assumed that all Class 1, 2, 3 and 5 lands and all presently irrigated <br />Class b lands would continue to receive project irrigation service. <br />The present plans do not include provision of irrigation service for <br />any new areas. On this basis, the project irrigated land area would <br />be 83,800 acres. Future studies should include a detailed classifi- <br />cation of the Class 5 and 6 lands to determine which lands should <br />continue to receive project irrigation service. <br /> <br />Water Supply <br /> <br />Irrigation Water Supply <br />Water requirements.--Requirements for irrigation water were <br />estimated using the method described in Technical Release No. 21 of <br />the So11 Conservat ion Service tit led "Irrigat ion Water Requirements". <br />Other information used in estimating the water requirements include <br />project cropping pattern data, usual local planting dates for annual <br />crops, temperature and precipitation data from the Montrose Weather <br />Station, and estimates of water application efficiencies. The esti- <br />mates of water application efficiencies were based on present appli- <br />cation methods. From this information, required monthly water <br />deliveries to project farms were computed. The requirements for <br />lands under the West Canal and the Montrose and Delta Canal were <br />computed separately because these lands experience water shortages <br />resulting from capacity limitations of the conveyance facilities. <br /> <br />. <br /> <br />Present water utilization.--As a means of evaulating the adequacy <br />of the present irrigation supply, the computed water requirements were <br />compared on a month by month basis with available supplies over the <br />1952-1970 period. Results of these comparisons are summarized in the <br />following tabulation. <br /> <br />57 <br />