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II II II * Mr. Ben K. Herda - Technician * Mrs. Cherie R, Kraft - Technical Typist I) II. STUDY AREA DESCRIPTION Data was also provided by the City of Louisville and Boulder County staff, A list of the information received and incorporated into the study is presented below: II ITEM 1\ Centennial Valley Mall II Hillsborough West Heritage Subdivision Filing No. 1 Centennial Valley .1 Dutch Creek Louisville Industrial Park Colorado Technical Center II II Industrial Area Improve- ments II The Stockade Sundance II Louisville Louisville Louisville II Louisville Louisville II Boulder County II II II 1\ II DESCRIPTION Hydrology Report Drainage Study Final Drainage Study Master Drainage Study Development Plan Utilities Utilities Drainage Plan Drainage Plan Sanitary Sewer System Zoning Districts Official City Map Development Plan Map Souths ide Wastewater Inter- ceptor Line, Phase I Comprehensive Plan Map -3- A. Location SOURCE The study area for the City of Louisville/Boulder County Basinwide Major Drainageway Planning Study is located approximately 18 miles northwest of Denver. The planning area includes 10,6 square illiles incompassing the City of Louisville and surrounding Boulder County area (see Drawing-i). The limits of the planning area are defined by Rock Creek on the East, U.S, 36 (Denver Boulder Turnpike) on the South, the Davidson Mesa on the loJest, and portions of South Boulder Road and Coal Creek on the North. The planning area is naturally divided into tributary areas of Coal Creek and Rock Creek (see Drawing-2). The Coal Creek basin (4.8 square miles) consists of the northwestern half of the planning area and includes the City of Louisville and areas southwest of the City that are prese.ntly under development. The basin contains drainageways A through E, totaling 9.6 stream miles of Outfall System Planning, The Rock Creek basin (5.8 square miles) consists of the southeastern half of tile study area and includes mostly undeveloped farm land. The basin contains drainageways F through J, totaling 10.7 stream miles of Outfall System Planning. National Survey and engineering, Nov., 1979 MSM, Inc" Oct., 1977 MSM, Inc., Jan., 1982 Faulkner-Kellogg and Assoc., Inc., April, 1981 RMC, Inc. Louisville Louisville Louisv ille McStain Enter" April, 1981 McStain Enter, RMC, Inc. Louisville, May, 1981 Louisville, 1981 Louisville, 1979 RMC, lue. , Feb, , 1981 B. Drainage Features Coal Creek Basin The Coal Creek basin has a West to East aspect with the high point (eleva- tion 5670) of the basin on the Davidson Mesa. The slopes on top of the Mesa are very mild, but rapidly approach 6 to 7% upon decent from the mesa, The terrain then levels out to an average grade of 2% for the remaining portion of the basin. Louisville, 1979 The soils in the basin are composed predominantly of the Ascalon and Nunn sandy and clayey loams with some Valmont Clay loams on the Davidson Mesa (Reference- 4). The remaining soils in the area include Calkins sandy loam, Kutch clay loams, Manter sandy loams, and Terrace escarpments. -4-