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. . . I. INTRODUCTION This flood hazard mitigation feasibility report was prepared for the City of Walsenburg by the Colorado Water Conservation Board (CWCB). Initiation of this study commenced following a request from the City of Walsenburg which was made because of potential flooding problems caused by stormwater overflows from the Holita Ditch along Colorado Avenue, A storm drainage system was constructed within a portion of the city in about 1985, The storm drain outfalls into the Holita Ditch near the intersection Colorado Avenue and Russell Avenue, During heavy rain storms, the Holita Ditch does not have capacity to carry the entire amount of stormwater that drains into it. The lack of ditch capacity would allow the stormwater to overflow the banks of the ditch, thus causing potential flooding problems, and damage (erosion or bank failure) to the ditch itself. Previous investigations for this particular stormwater issue were made by the Soil Conservation Service (now the Natural Resources Conservation Service). The City of Walsenburg is very interested in completing flood hazard mitigation project to alleviate future flooding problems along the Holita Ditch, According to Section 37-60-l06(1)(c) of the Colorado Revised Statutes, the Colorado Water Conservation Board has the power and duty: ",.. to devise and formulate methods, means and plans for bringing about the greater utilization of the waters of the state and the prevention of flood damages therefrom and to designate and approve storm or floodway runoff channels or basins, and to make such designations available to legislative bodies of cities and unincorporated towns; to county planning commissions; and to boards of adjustments of cities; incorporated towns; and counties of this state..." II. PURPOSE AND SCOPE The purposes of this feasibility study are to evaluate the stormwater drainage problem in Walsenburg; to investigate alternatiye solutions to the problem; and to prepare preliminary designs, construction cost estimates, and a project report for the recommended "plan of improvement." The information developed for this study will be used by City officials to assist in the selection of flood mitigation measures for the implementation of a recommended "plan of improvement," and to help secure project funding for the construction of the improvements, The scope of the study includes the following items: