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<br />loam - gypsic variant makes up approximately 2.20% of the irrigated lands <br />under the Paradox Valley Canal and Reservoir system. <br /> <br />. <br /> <br />Colombo Silty Clay Loam. Colombo silty clay loam is level to nearly level <br />with well drained soils on a slightly raised flood plane in the North- <br />west part of the survey area and have been mapped adjacent to the West <br />Paradox Creek. The average annual precipitation is about 11 inches and <br />the mean annual air temperature is about 490 F. The frost free season <br />is from 110 to 135 days. Water and air move through this soil at a mode- <br />rate slow rate and run-off is rapid. Erosion hazzard is moderate. Water <br />holding capability is high. The soils are not suitable for building site <br />areas due to the flooding hazzard. Colombo silty clay loam make up 28.68% <br />of the lands irrigated under the Paradox Valley Canal and Reservoir system <br />and are identified as Class VI lands. <br /> <br />The land capability classification as prepared by the Soil Conservation Service <br />separated the project lands into three classes. These classes are Class II, <br />Class III, and Class VI. The land capability classification included arable <br />as well as non-arable lands since no additional land will be brought into <br />production by the proposed project this report will dwell only on those lands <br />presently under production and irrigated from the Paradox Valley Canal and <br />Reservoir system. Class II lands are defined as lands of moderate suitability <br />for irrigation farming, being less desirable than Class I lands (of which none <br />have been classified in the Paradox Valley). Class II lands are somewhat lower <br />in productive capacity than Class I lands, Class II lands are more expensive <br />to develop, are more costly to farm than Class I lands. Topographic conditions <br />include uneven surfaces, shorter irrigation runs, or steeper slopes, neces- <br />sitating special care and a higher cost to irrigate. Class II lands can still <br />be farmed using irrigation, it is just that the net dollar yield per acre will <br />be realized as for Class II lands as with Class I lands. <br /> <br />Class III lands have been identified as lands that are less desirable for irri- <br />gation farming than Class I lands and Class II lands. Class III lands have a <br />more limited productive capacity and either more extensive rock cover or steeper <br />slopes than Class I and Class III lands entail greater costs for clearing, <br />improving, and farming. <br /> <br />. <br /> <br />Class VI lands have been identified "s lands that include non-arable lands which <br />do not meet the minimum requirements of arable land, either due to topography, <br />soils, drainage, or other deficiencies. Some small isolated bodies of arable <br />land lying within larger bodies of non-arable land are also classified as Class <br />VI lands. <br /> <br />Table III gives a summary of the various classes of land served by the Paradox <br />Valley Canal and Reservoir system showing only those acreages which are pre- <br />sently under cultivation and irrigation. <br /> <br />IlI-2 <br />