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<br />- 20 - <br /> <br /> <br />SECTION 2 <br /> <br />, <br /> <br />~ <br />~ <br />t <br />, <br /> <br /> <br />i <br />, <br />~ <br />I <br />I <br /> <br />INVESTIGATIONS, ANALYSES, AND SUPPORTING TABLES <br /> <br />INVESTIGATIONS AND ANALYSES <br /> <br />Project Formulation <br /> <br />. <br /> <br />The primary objective of this plan is to reduce floodwater, <br />erosion, and sediment damages resulting from high intensity storms. <br />The project involves flows of such magnitude that the effect on <br />runoff by land treatment measures alone would be comparatively <br />insignificant. Early investigations indicated a need for several <br />types of controls not generally attainable under existing programs. <br />These include waterflow control structures, grade stabilization <br />structures, diversions, and fire protection measures. <br /> <br />[ <br />.. <br />. <br /> <br />Several different plans for accomplishing project objectives <br />were evaluated. This involved consideration of types and locations <br />of structures and other measures and combination of such measures <br />that would provide acceptable levels of protection. A great many <br />of these structures were found not feasible because of infrequent <br />damages resulting from entrenched and enlarged channels. <br /> <br />( <br />r <br />~ <br /> <br />Determination of the needed kinds and amounts of land treatment <br />measures for watershed protection and for flood prevention was based <br />on land capability estimates developed from available soil, woodland, <br />and vegetation surveys, The existing land treatment measures that <br />contribute directly to watershed protection and flood prevention and <br />those measures that need to be applied during the project period were <br />determined from current records maintained in the office of the <br />Soil Conservation Service assisting the Cherry Creek Soil Conservation <br />District and from a study of watershed conditions made by the Work <br />Unit Conservationist, Area Specialists, and Colorado State and <br />District Foresters. Emphasis was placed on the selection of measures <br />that are effective in reducing runoff, erosion, and sediment production. <br />Hydraulic, hydrologic, sedimentation, and economic investigations <br />provided data as to the effects of these measures in reducing <br />floodwater, erosion, and sediment damages. <br /> <br />I <br /> <br />t <br />