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SECTION I l"orJTRODUCTION report has been prepared as a part of the overall Master Drainage Basin Planning Study for Monument Creek. Summarv This report presents the analysis of baseline hydrology for Monument Creek. Discharges were generated utili2:ing the SCS dimensionless hydrograph method with kinematic wave routing within the HEC-I computer model for nUmerous locations on the creek beginning at iL~ headwaters and ending at its confluence with Fountain Creek. The hydrology model uses an elliptical rainfall distribution pattern based upon Hydromet 52. Maximum point rainfall amounts of 2.03 inches and 4.32 inches developed from the NOAA Atlas 2. Volume III Colorado were used. The projected discharges were generated assuming both existing and future land development conditions in the basin for 10- and lOO-year return periods and a stann duration of 24 hours. Study results are surnmarized at key design points in Table I. The discharges shown in Table I are the results of the most detailed hydrologic lUIalyses yet completed on Monument Creek and compare favorably to other studies and methods. The lOO-year discharge is higher than that used in the Corps of Engineen;' previous study by 23 percent. The higher discharge is reasonable when consideration is given to the methods and levels of effort used in both studies. Puroose The purpose of the drainage basin planning study is to identify and propose a storm water management plan to satisfy the existing and future needs within the Monument Creek Basin (the study area). The intent of detennining a SlOnn water management plan for the basin is to provide guidelines for future development in the basin and for future flood control projects. The hydrologic study provides the basis for the analysis of floodplain hydraulics, thedetemtination of alternative flood control scenarios, and the siz.ing of flood control structures and rela ted improvements along Monument Creek within the study reach. Acknowledl!mcnts During the preparation of the slUdy, a number of govemmem agencies and interested individuals were involved in a series of technical review meetings. Representatives from the U.S. Army Corps of Engineers (COE), Soil Con-'lervation Service (SCS), Colorado Water Conservation Board (CWCB), Federal Emergency Management Agency (FEMA). and various City Departments provided valuable commentary during the development of the hydrology model. A listing of the individuals and their agencies who we~ involved in the coordination of the hydrology smdy has been presented belnw: Table I Summary of Projected Discharges Approximate Design E"isting Future Existing Future Location Point loo-Yr. l00-Yr. lO-Yr. 100Yr. South Boundary Air Force Academy 319 31,500 32,600 1.930 2.510 ConfluenL"ewith Fountain Creek m 39.400 46.700 3,230 6570 N:l..T.C Gary Haynes Bruce Thorson Ken Sampley Bruce Beach Craig Blewitt Phil Boawn Dan Bunting Doug Cain Brian Hyde Larrylang lohnLiou Alan Morrice Rick O'Connor StcveSchild Glade Wilkes Ar::enc\' City of Colorado Springs Engineering Division City of Colorado Springs Engineering Division City of Colorado Springs Engineering Division U.S. Anny Corps of Engineers City of Colorado Springs Planning Depanment U.S. Anny Corps of Engineers Regional Building Depanment U.S.GeologicalServiee Colorado Water Conservation Board Colorado Water Conservation Board Federal Emergency Management Agency El Paso County Depmtment of Public Works EI Paso County Planning Oepanment NationaiWeatherService Soil Conservation Ser'iice Authori7_1tion The Monument Creek Drairlage Basin Planning Study was authorized under the tenns of Contract Number 91C-2026 belv.'een the City of Colorado Springs and CU2M HILL. The contract was approved and authorized by the Colorado Springg City Council. This hydrolog)' (.1 1.2