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<br />. <br /> <br />OBJECTIVES <br /> <br /> <br />The primary objective of this study is to prepare flood plain maps <br />for flood plain zoning ordinances and other land use controls, as needed, <br />to reduce potential flood damages and unwise development in the flood <br />plain. The engineering and hydrologic information to be developed <br />during the study will be of use in developing a master drainage plan~ in <br />road and bridge planning and design, and in the planning of flood control <br />structures, if needed. <br /> <br />INTENSITY OF INVESTIGATIONS <br /> <br />Studies will be undertaken to develop flood hazard information for <br />the 10-, 50-, 100-, and SOO-year frequency floods under existing channel <br />and flood plain conditions. Photogrammetric maps with topography, <br />planimetry, and flood plain information for the 100- and SOO-year frequency <br />floods will be prepared on a scale of 1" = 400'. The contour interval <br />will be two feet in the flatter flood plain areas and an appropriate <br />contour interval will be used in the steeper areas compatible to the <br />scale of mapping. <br /> <br />. <br /> <br />Available basic data such as flooding history, photos, land use, <br />and existing survey data will be collected. Pertinent data from this <br />information will be used in the study. <br /> <br />Engineering field surveys will be conducted to establish vertical <br />and horizontal ground control and to obtain dimensions of bridges and <br />culverts, About 130 flood plain cross-sections will be needed to ade- <br />quately define the hydraul ic relationships. Cross-section data will be <br />obtained photogrammetrically where feasible. <br /> <br />The magnitude, elevation, and location of flooding for the designated <br />frequency floods will be developed from hydrologic and hydraulic analyses <br />using standard Soil Conservation Service techniques and procedures. <br /> <br />INTERAGENCY COORDINATION <br /> <br />Close coordination will be maintained through the representatives <br />of the Colorado Water Conservation Board, Chaffee County, the Town of <br />Buena Vista, and the Soil Conservation Service to assure the completion <br />of the study in a timely manner. Coordination with other concerned <br />state, federal, and local agencies will be maintained throughout the <br />study by the Colorado Water Conservation Board, <br /> <br />. <br /> <br />2 <br />