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<br />STEP 9 <br /> <br />HYDROLOGIC II~NALYSIS <br /> <br />Through the hydrologic analysis, a reasonable lDO-year fl.ow is determined, <br /> <br />. A local floodplain administrator lIleeds to be familiar with the <br />hydrologic regions of their area. <br />If there are distinct regions such as plains, mesas, foothills or mountains <br />in the community or nearby, that information needs to be c:onsidered. <br />Different regions have different runoff l~haracteristics. <br /> <br />. There may be applicable floodplain s~udies :that bavl~ been conducted <br />nearby. <br />It may not always be necessary to generate new hydrology, Check with <br />local, regional, state or federal agencies about other studies that may <br />provide guidance for the site in question, <br /> <br />. Often times, regional equations may be used to develop the hydrology <br />for an area with approximate mappiing information. <br />The U,S.G.S. has prepared regional regressions for different portions of the <br />state,. The reports containing the regressions may be helpfuL <br /> <br />. The Colorado Water Conservation Boar'd (CWCB) is currently <br />working with the U.s" Army COI']l'S of EJ1gine.~rs in developing a <br />Colorado Hydrology Manual. <br />The manual will discuss hydrologic regions in Colorado, methodologies for <br />those regions and the parameters for the various methodologies, <br /> <br />. Gage analysis may be III possible me~LIls of d,eveloping hydrology for a <br />specific drainage area if the data is suitable for the :malysis. <br />For some locations, a stream gage will be conveniently located, For other <br />locations, a nearby gage can provide a useful comparison to the basin of <br />interest. <br /> <br />NOTE: Remember, when developing hydrologk information, contact other <br />adjacent communities as well as agencies such as the Soil <br />Conservation Service, FEMA, the Urban Dra.inage and Flood <br />Control District (for the Denvel: Metro Area) and the CWCB. <br />