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I I I I I I I I I I I I I I I I I I I SECTION I INTRODUCTION The master drainageway planning of Slaughterhouse Gulch was undertaken in 1973 by the City of Littleton in cooperation with the Denver Regional Council of Governments and the Depart- ment of Housing and Urban Development (HUD). The project has been coordinated directly with the City. The engineer- ing firm of Frasier & Gingery, Inc. was retained to carry out the planning and preliminary engineering efforts needed to identify and resolve the flood hazards associated with Slaughterhouse Gulch. Planning included the mapping, study, evaluation and recommendation of solutions to the identifiable drainage problems within the study reach of the Gulch. Consistent with the present Metropolitan wide concern and awareness of drainage and flood controls needs, the City of Littleton initiated the master planning study for Slaughterhouse Gulch. As the study area is totally within the City limits, and thus not an interjurisdictional project, it was impossible to obtain funds and assistance from the Urban Drainage and Flood Control District. Even though the Urban Drainage and Flood Control District did not participate, the project was undertaken with basically the same intent and thoroughness as those projects sponsored by the Urban Drainage and Flood Control District. Thus the results and recommendations of this plan are very consistent with drainageway planning spon- sored by the District throughout the Denver Metropolitan Area. The scope of services outlined in the contract agreement for this project was used as a guide for completing the work. A summary of the major items is tabulated below: a Base Mapping Base maps of the study area were prepared utilizing aerial topographic mapping. The base maps were prepared at a scale of 1" = SO' with a 1 foot vertical contour interval. The high accuracy of mapping was selected at this time to permit its use with planning, final design and construction of the recom- mended improvements. The maps were compiled to National Mapping Standards accuracy and were completed utilizing precise ground control. b. Hydrology A complete hydrological study of the total drainage basin has been completed to determine the probable flood magnitudes for the two, five, ten and 100 year storm frequencies. The hydrological evaluation has been com- pleted for the ultimate land use condition within the basin, reflecting both existing and future channel conditions. I-I