PROJ00452 - Laserfiche WebLink

Home Browse Search

Project lands Class 2 Irrigable Limitations of potential productivity under average management or somewhat higher development costs resulted in 12,510 acres or 64 percent of the irrigable area being placed in class 2. Class 2 lands have a composite productivity index of 81,5 percent. To achieve maximum efficiency in water utilization, development work costing an average of $20 an acre will be required. Of the total class 2 lands, 12,118 acres have moderately low potential productivity, For these lands, only minimum costs averaging about $16 per acre will be required for development works, but yields are expected to be lower because of several limitations. These limitations and acreages affected are shown in the following tabulation: ~ Type of limitation Severity of limitation 10,501 Topsoil and/or subsoil are heavy clay loam or very permeable clay 2 to 4 percent slopes Minor flooding about 1 year in 5 Water table is 5 to 10 feet below surface 0.2 to 0.4 percent total soluble salts Fine textured soils 1,044 83 Gradient topography Subject to flooding 125 425 Subsurface drainage Saline soils 12,lT8 Other lands totaling 392 acres were placed in class 2 because of relatively high development costs which were estimated to average $140 per acre, The productivity of these lands will approach that of class 1 lands: but due to pronounced undulations, higher costs of leveling will be required than for class 1 lands. Class 3 Irrigable Lands totaling 5,992 acres, or 30 percent of the irrigable area, were assigned to class 3. These lands have an estimated composite productivity index of 11.2, and an average development cost of $20 per acre, Their limitations result from about the same type of physical conditions as those pertaining to class 2 lands, but are more severe. Consequently, the class 3 lands are more marginal for irrigation, 34 I I i