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I I I I I I I I I I I I I I I I I I I of any development which would obstruct flow, Unrecognized flood control facilities or possible future improvements were not considered in this report, We would also like to acknowledge the assistance of Advanced Sciences, Inc, professionals who have contributed to the preparation of this report. Dr. Timothy Steele Group Manager, Physical Sciences Flood water profIles and floodplain boundaries are often changed by road and bridge construction, floodplain development, flood control improvements, or natural processes. Prior to utilization of this report for planning or design purposes, the user is advised to contact the UDFCD to determine if the information in this report has been revised, Mr. Tyler Smart Project Manager Mr. Mark Thombrough Staff Engineer Ms. Lonjane Tyler Word Processing 1.3 ACKNOWLEDGEMENTS Mr, Frank Sugihara Graphics This report was prepared by Advanced Sciences, Inc., consulting engineers of Lakewood, Colorado, at the request of the UDFCD, 1.4 PREVIOUS STUDIES All surveying and topographic data for this study was based on the USGS datum for mean sea level and was collected and compiled by Landmark Mapping, Ltd" (1990), under a separate contract with the Urban Drainage and Flood control District. Some existing studies have been used as background information for the preparation of this study. In addition, information was solicited from numerous local, state and federal agencies. A summary of the information collected is given below: Source Tvpe of Information We wish to acknowledge the individuals and agencies whose input was i!lvaluable in the preparation of this report. The assistance and information obtained from the following individuals is greatly appreciated. Urban Drainage and Flood Control District Flood Hazard Area Delineation Report for Lower Boulder Creek City of Lafayette Future Land Use Information, Development Plans, Property Ownership Maps Mr, Bill DeGroot Urban Drainage and Flood Control District City of Louisville Future Land Use Information, Development Plans Mr, Ben Urbonas Urban Drainage and Flood Control District Mr, Pat Sorenson City of Lafayette - Engineering Boulder County Future Land Use Information, Ditch and Reservoir Information. Ms. Deanna Butterbaugh City of Louisville - Engineering Mr. Joe Huey Boulder County - Engineering Ms, Sara Allene Wise Leyner-Cottonwood Ditch Company FLOOD HAZARD AREA DELINEATION BULUlEAD GULCH AND TIUBUTARIES FINAL 7131191 2