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<br />. <br /> <br />PREFACE <br /> <br />. <br /> <br />. <br /> <br />This report was prepared for the Urban Drainage <br />and Flood Control District as part of their 1975 Work <br />Program to delineate flood hazard areas and for the <br />guidance of local officials in planning the use and <br />regula tion of the flood plain. The report includes <br />information on historical floods as well as the nature <br />and extent of the probable future floods which can be <br />reasonably expected. <br /> <br />. <br /> <br />. <br /> <br />The report shows the areas along Cherry Creek <br />between the South Platte River and Cherry Creek <br />Reservoir that are subject to flooding in a 100-year <br />recurrence flood. The flood plain is based on future <br />fully developed conditions within the basin, as deter- <br />mined from current planning and zoning maps, and <br />upon the present channel condition and flow capacity. <br /> <br />. <br /> <br />. <br /> <br />The Flood Hazard Area Delineation maps shOw <br />the flood plain and water surface profile of the 100- <br />year flood. The flooding outside the channel along the <br />south side of Cherry Creek, west of South Monaco <br />Parkway, is caused from the lack of an adequate <br />channel on Goldsmith Gulch, a major tributary to <br />Cherry Creek, which channels the flood water along <br />streets and through the low areas. The majority of the <br />remaining flooding is caused by overtopping of the <br />channel banks at several locations along Cherry Creek, <br />being most notable between First Avenue and Broad- <br />way, and between Colfax and the South Platte River. <br />The topography of these areas along Cherry Creek is <br />such that when an overflow occurs, the water then <br /> <br />~ <br /> <br />~ <br /> <br />.I <br /> <br />flows through areas lying lower than the channel banks <br />until it can return to the channel. <br /> <br />c. <br /> <br />Sta te Eng-ineer <br /> <br />SUMMARY OF AVAILABLE DATA <br /> <br />Has gaging records for Cherry Creek. <br /> <br />The following is a summary of pertinent data <br />available and the source of the data. <br /> <br />d. <br /> <br />Environmental Protection Agency <br /> <br />a. Urban Drainage and Flood Control District <br /> <br />STORM WATER MANAGEMENT MODEL EPA <br />Report No. 11024 DOC 07/71 <br /> <br />RAINFALL/RUNOFF INFORMATION, May 1972 <br /> <br />This is a computer program for modeling the <br />runoff from drainage basins, commonly referred <br />to as the SWMM program. <br /> <br />This is a publication of rainfall data for various <br />storm frequencies for the Denver Metropolitan <br />area. This is also referred to as Project REUSE <br />rainfall data. <br /> <br />MAJOR BASIN FEATURES <br /> <br />b. <br /> <br />Corps of Engineers <br /> <br />The Cherry Creek basin encompasses a total area <br />of 410 square miles of which the Cherry Creek Dam <br />and Reservoir controls 385 square miles. <br /> <br />The following reports contain information re- <br />garding Cherry Creek: <br /> <br />(l) SPECIAL FLOOD HAZARD REPORT TO <br />REVISE VOLUME II, SAND, TOLLGATE, <br />AND LOWER CHERRY CREEKS, July 1971 <br /> <br />The study area is the reach of Cherry Creek <br />from the Dam to the South Platte River, a distance of <br />approximately 11.7 miles. <br /> <br />(2) INTERIM REPORT ON SAND AND TOLL- <br />GATE CREEKS, COLORADO VOLUMES I <br />and II, August 1969 (Revised January 1972) <br /> <br />The total Lower Cherry Creek basin within this <br />study covers 16,110 acres (25.2 square miles), with <br />Goldsmith Gulch contributing 4,951 acres (7.7 square <br />miles) of the total area. <br /> <br />(3) FLOOD PLAIN INFORMATION, VOLUME <br />VI, DENVER METROPOLITAN REGION, <br />COLORADO (Goldsmith Gulch) October <br />1971 <br /> <br />The Cherry Creek channel falls from an eleva- <br />tion of 5,498 feet above sea level at the Dam outlet <br />works to an elevation of 5,167 feet at the South Platte <br /> <br />1 <br />