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I I I I I I I I I I I I I I I I I I I - PREFACE - from the South Platte confluence to Federal Boulevard, approxi- mately 1.6 miles. The report identifies the 100-year floodplains in plan view and the corresponding water surface profiles. This 100-year frequency event is the regulatory flood as identified by the District, the Colorado Water Conservation Board, the Federal Emergency Management Agency and the Cities of Denver and Englewood. Authorization This report was prepared under an Agreement with the Urban Drainage and Flood Control District as part of their continuing program of identifying flood hazard areas along stream channels within their jurisdiction. The District makes this floodplain information available to local governing agencies for use in their programs of floodplain management, and to the public to create an awareness of potential floodprone areas. This report identifies these flood- prone areas along Harvard Gulch, Dry Gulch and West Harvard Gulch within the Cities of Denver and Englewood. In addition, a floodway was identified for each stream along the entire length of the study. The floodway is a high hazard area characterized by deep water and high velocity flows during flood events and should remain free of any development which would obstruct flow. This study was prepared in conjunction with the Denver Flood Insur- ance Study prepared for the Federal Emergency Management Agency (Reference 1). The hydrologic and hydraulic analyses were completed as part of the Flood Insurance Study, and this information is pre- sented herein in the format of the District's Flood Hazard Area Delineation Reports. The information in this report does not imply any action by the District or the State of Colorado to regulate use of floodplains. The report does provide suitable basis for the adoption of land use contruls to guide floodplain management on the local govern- ment level. Flood water surface elevations and floodplain boundaries are often revised by road and bridge construction floodplain development, flood control improvements, or natural processes. Prior to utili- zation of this report for planning or design purposes, the user is advised to contact the Urban Drainage and Flood Control District to determine if the information in this report has been amended. Upon review and acceptance of this report by the District, and review and designation of the flood hazard areas by the Colorado Water Conservation Board, this study can be used by the City of Denver and the City of Englewood to regulate floodplain areas. This report is also used by the District to identify and priori- tize areas for further study toward drainageway improvements for for flood mitigation. This report was prepared by Gingery Associates, Inc., Consulting Engineers of Englewood, Colorado, at the request of the District. The topographic mapping was prepared by Delta Aerial Surveys, Inc., of Denver, Colorado. Scope of Work This study consists of a floodplain analysis of Harvard Gulch and West Harvard Gulch, two tributaries of the South Platte River in southern Denver, and Dry Gulch, a tributary of Harvard Gulch (Sheets 1 and 2). The study reach on Harvard Gulch extends from its confluence eastward to Colorado Boulevard, a distance of approximately 3.2 miles. A short reach of Dry Gulch was studied from its confluence with Harvard Gulch in Logan Park to Yale ~venue. On West Harvard Gulch, the study reach extends westward The assistance of the City of Denver in providing information on the several drainage structures located in these basins is greatly appreciated. Topographic Mapping Topographic mapping was prepared under this contract at contour interval, and a scale of 1"=100' (Reference 2). -1- a 2-foot The mapping