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<br />S E C T ION II: <br /> <br />Soils Characteristics <br /> <br />A.) General Discussion <br />An important consideration in the preparation of a <br />drainage master plan is a detailed analysis of the various <br />types of soils in the watershed basin. Among the soils <br />properties most important to the engineer in hydrology studies <br />are permeability, shear strength, density, shrink-slvell <br />potential, compaction characteristics, grain-size distribution, <br />plasticity, depth to water taLle, depth to bedrock, water <br />holding capacity and slope. Since different soils have <br />varying infiltration and saturation capacities, runoff r8tes <br />can vary depending on soils types in the watershed basin. <br />Soil survey reports for Arapahoe and Douglas Counties have <br />been utilized to classify the types of soils into five major <br />hydrologically similar groups for use in the preparation of <br />the drainage master plan. <br />Soils information was not available for that part of <br />Douglas County lying within the confines of the Phipps Ranch. <br />This amounts to a substantial part of the basin ln Douglas <br />County and includes all or portions of Sections 5, 6, 7, 8, <br />17, 18, 19, 20, 29, and 30 of Rangc 67W and Sections 1, 2, 12, <br />24, and 25 of Range 68W. Soil types for these areas were <br />determined by the analysis of adjacent areas for which soil <br />surveys have been conducted. <br /> <br />-17- <br />