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<br />of cropping patterns and crop yields on existing agricultural lands for several <br />recent years of record. <br /> <br />4.2.5 Water Demands <br /> <br />Study area water demands are generally estimated for a selected planning horizon or <br />period of time. For municipal water supply studies, the demand estimates are generally <br />based on such parameters as population, land use, income, employment, price of water <br />and climatic data. Demands are estimated for the study planning horizon and compared <br />with the yields of existing supplies. If the comparison indicates a water supply deficit <br />at some point during the planning horizon, alternatives are formulated to meet the deficit <br />by reducing demands or increasing supplies, or both. <br /> <br />Agricultural water demand estimates are generally based on irrigated areas, crop water <br />use, climatic data and distribution system losses. Alternatives are then formulated to <br />supply irrigation water to the project service area under varying degrees of reliability. <br />Alternatives should also include the concept of more efficient management of existing <br />supplies of irrigation water. <br /> <br />For both agricultural and municipal projects, the projected annual and monthly demands <br />should be tabulated in the feasibility study. Projections which vary through the planning <br />horizon due to changing demands should be tabulated by year. For projects which <br />involve only the rehabilitation of existing facilities, a tabulation of current water <br />demands may be sufficient <br /> <br />4.2.6 Project Lands <br /> <br />For projects which involve the irrigation of new lands, a land classification survey <br />should be included in the feasibility study. The specifications for the land classification <br />survey should be developed in consultation with the CWCB staff and should include: <br />standards for the land classification system, use of previous surveys, map type and scale, <br />number of test holes per section, depth of holes, number of samples taken, number and <br />types of chemical and physical analyses, and number and types of field tests conducted. <br /> <br />The standards for the land classification system should take into consideration the <br />following parameters for each land class: depth of soil, acidity, salinity, texture of root <br />zone, available moisture capacity, permeability, topography and drainage conditions. <br /> <br />The results of the survey should be presented in the study report as a tabulation of <br />proposed irrigated lands by land class and as a service area map. The map should show <br />the boundaries of the project service area, the limits of presently irrigated areas and of <br />the classified area. Within the classified area, the various land classes should be <br />delineated. <br /> <br />23 <br />