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I I I I I I I I I I I I I I I I I I I A. Authorization (3) Prepare plan and profile drawings of the Henry's Lake Basin drainageway showing the 100-year floodplain and the 10-year and 100-year flood profiles based upon future basin development conditions and existing channel conditions. CHAPTER I - INTRODUCTION This study, covering the storm drainage aspects and flood hazard area delineation (FHAD) for Henry's Lake Basin was authorized under the terms of the contract between the Urban Drainage and Flood Control District (UD&FCD), the City of Lakewood, Jefferson County, and Water Resources Consultants, Inc. (WRC), dated July 20, 1982. The notice to proceed was given on October 25, 1982. Fl oodplai ns are often al tered by road and bridge construction, development within the floodplain, flood control improvements, or by natural processes. Prior to utilizing the information contained in this report for the purposes of planning or design, the user is advised to contact the UD&FCD or the Colorado Water Conservation Board (CWCB) to determine if the information in this report has been amended. The original study area was amended by Addendum No.1, dated December 29, 1982, which extended the FHAD study to an area east of the original study limit to account for a flow split originating in the area of the Academy Park Development at Hampden Avenue. C. Information Procurement The participating or sponsoring governmental agencies for this study are the UD&FCD, Jefferson County, and the City of Lakewood. The mapping of the basin was accomplished under separate contract between the UD&FCD and Landmark Mapping Company. Excellent cooperation and assistance was provided throughout the study by the City of Lakewood, Jefferson County, and UD&FCD staff. During the process of this study, several agencies, organizations, and individuals were contacted by WRC staff members to obtain data and history on the storm drainage within the study area. A considerable amount of data was provided by the City of Lakewood and Jefferson County staff. We received excellent cooperation from all the agencies and individuals that have interest in the Henry's Lake Basin study area. The fOllowing is a list of agencies and individuals and the information they have provided. B. Purpose and Scope (1) Define the hydrologic, topographic, and land use features of the basin. AGENCY CONTACT INFORMATION PROVIDED Urban Drainage and Flood B. Urbonas Project Di rect ion Control District City of Lakewood R. Plastino Proj ect Data/Mappi ng K. Ross Jefferson County L. Wood Project Data/Mapping Soil Conservation Se rvi ce R. Bell Soils Data Bishop and Associates H. Bishop Warrior Ditch Data 1st Bank of Academy Park T. Charnecki Proposed Site Work Colorado Department of M. McKee Hampden Avenue Ditch Highways -1- The purpose of the study was to evaluate the hydrological and hydraulic aspects of the storm drainage for the Henry's Lake Basin to define the 100-year floodplain. The scope of the work for this study can be summarized as follows: (2) Define the floodplain and the floodway for the 100-year flood.