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I I I I I I I I I I I I I I I I I I I PREFACE It should be noted that for the purposes of this report, the term "100-Year Authori zation F100dn is the result of the lOO-year storm, and the terms can be used This report was authorized by the Urban Drainage and Flood Control District in joint sponsorship with the Colorado Water Conservation Board. The District has the power to enact District-wide flood plain reou1ations, At present, the District makes flood plain information and mapping available for local agencies to adopt and administer their own flood plain regulations with the assistance of the District. i nterchangeab 1y . Purpose and Scope This report was prepared for the guidance of local officials in planning the use and regulation of the floodplain of the 1st Avenue and the Dakota Avenue Tributaries of Weir Gulch. The report includes information on the nature and extent of past and probable future floods. The flood history is based on inter- The Colorado Water Conservation Board has the power and duty n.,. to designate and approve storm or f100dway runoff channels or basins, and to make such designations available to legislative bodies of cities and incorporated towns; to county planning commissions; and to boards of adjustment of cities; incorporated towns; and counties of this state... n views of residents living in the area; whereas future flooding is based on future land use information provided by the participating municipalities. The limits of flooding due to a 100-year storm, based on fully developed conditions, should be given proper consideration before planning for any development in the flood plain. as stated in Section 37-60-106 (l)(c) of the Colorado Revised Statutes 1973. The cities, incorporated towns and counties within the study area may provide zoning regulations ... The Flood Hazard Area Delineation maps show the limits of flooding due to a 100-year storm occurring over the fully developed basin under existing channel n... to establish, regulate, restrict, and limit such uses on or along any storm or floodwater runoff channel or basin, as such storm or floodwater runoff or basin has been desi gnated and approved by the Colorado Water Conservation Board, in order to lessen or avoid the hazards to persons and damage to property resulting from the accumulation of storm or flood- waters n and drainageway conditions. Improvements to the channel or future encroach- ments in the flood plain are not considered in this report. as stated in Section 30-2B-111 for the county governments and Section 31-23-201 for municipal governments of the Colorado Revised Statutes 1973. The profile associated with the maps shows the depth of the laO-year flood and the la-year flood in relation to the thM1weg, which is the lowest point of the drainageway. Cross-sections at selected locations are used to indicate typical existing flood plain conditions. Upon acceptance of this report by the Urban Drainage and Flood Control District and the designation and approval of this report by the Colorado Water Conser- vation Board, the areas described as being inundated by the 100-year flood can be designated as flood hazard areas and their use regulated accordingly. The information presented in this report does not imply any action by State or local authorities to zone or regulate the use of the flood plain shown. The report provides a basis for the adoption of land use controls and flood plain management r!eas ures to reduce flood losses.