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<br />I <br />I, <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />'I <br /> <br />Section 1.0 <br />Introduction <br /> <br />1.1 Authorization <br /> <br />This report documents the hydrologic analysis for the Upper Box Elder Creek Outfall <br />Systems Planning Study and Coyote Run Flood Hazard Area Delineation (FHAD). The <br />work was authorized by the Urban Drainage and Flood Control District (UDFCD) on <br />October 7, 1993. Specific tasks were performed in accordance with the terms of Agree- <br />ment No. 92-11.06. The report was prepared for UDFCD, the City of Aurora, Arapahoe <br />County, and Adams County by CH2M HILL, Denver, Colorado. <br /> <br />1.2 Purpose <br /> <br />The purpose of the hydrologic analysis was to establish baseline peak discharges and <br />volumes in the study area for 2-,5-, 10-,50-, 100-, and 500-year storm events for <br />existing and future development conditions. The hydrologic results will be used in subse- <br />quent phases of the Outfall Systems Planning Study and FHAD for hydraulic calculations, <br />assessments of existing drainage facilities, and development of alternative drainage <br />improvement plans. <br /> <br />DENlOOISI83,WPS <br /> <br />1-1 <br />