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Last modified
11/23/2009 12:58:19 PM
Creation date
10/4/2006 9:57:23 PM
Metadata
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Template:
Floodplain Documents
County
Arapahoe
Stream Name
Cherry Creek
Title
Engineering Division Technical Report Cherry Creek Watershed
Date
12/1/1991
Prepared For
Arapahoe County
Prepared By
US Army Corps of Engineers
Floodplain - Doc Type
Flood Documentation Report
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<br />INTRODUCTION <br /> <br />1. Purpose <br />The purpose of this report is to present the <br />methodology, assumptions, and results of an example <br />application of the Hydrologic Engineering Center's Flood <br />Hydrograph Package, HEC-1, for determining a standard Project <br />Flood and an Inflow Design Flood. The US Army Corps of <br />Engineers' Cherry Creek Dam and Reservoir near Denver, <br />Colorado was chosen as the site for the study. <br />Objectives of this hydrologic study are listed as <br />follows: <br />1) Derive the Standard Project Storm for Cherry Creek <br />Reservoir and with it develop the Standard Project Flood using <br />HEC-l. <br />2) Derive the probable Maximum Precipitation for Cherry <br />Creek Reservoir and with it develop the Inflow Design Flood <br />using HEC-1. <br /> <br />2. Scope <br />The scope of this' study is to provide general <br />information concerning the hydrology of Cherry Creek basin and <br />to apply the HEC-1 Flood Hydrograph Package to Cherry Creek <br />Reservoir for deriving the Standard project Flood (SPF) and <br />Inflow Design Flood (IDF). The SPF hydro graph is based on <br />hydrometeorological criteria presented in US ACE civil Engineer <br />Bulletin No. 52-8 (EM 1110-2-1411). The IDF hydro graph is <br />based on criteria presented in Hydrometeorlogical Report No. <br />55A and USACE Regulation ER 1110-8-2(FR). The flood <br />hydrographs are routed through the Cherry Creek reservoir <br />using the Flood Hydrograph Package HEC-1 developed by the <br />Hydrologic Engineering Center. This report is based on <br />information extracted from the Omaha District's "Hydrologic <br />Improvement Assessment, Cherry Creek Lake, Colorado" <br />Reconnaissance Report dated September, 1990. <br /> <br />3. Basin Description <br />a. Dimensions. cherry Creek basin is located southeast <br />of Denver, Colorado, and drains an area of 410 square miles, <br />of which 385 square miles lie upstream from cherry Creek Dam. <br />Headwaters of the basin are located along the foothills of <br />the Rocky Mountains in El Paso county, Colorado, 11 miles <br />south and east of Monument, Colorado. The basin lies in a <br />high plains area immediately east of the Front Range of the <br />Rocky Mountains and extends generally parallel to the Front <br />Range. Length of the basin is about 57 miles and average <br /> <br />1 <br />
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