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<br />. <br /> <br />e <br /> <br />e <br /> <br />TABLE 6 <br />Definitions for Rel!ulatinl! Approximate Zone A Floodplains <br /> <br />Term Definition <br />Regional Any current published regional regression equations by the CWCB or US <br />regression Geological Survey that estimate] OO-year peak flows for streams in the geographic <br />eouations area of interest <br />Limited Development involving parks, open space, golf courses, agriculture. bridges <br />development and culverts that serve a single farm/home/cabin, pole barns and individual single <br />familv structures <br />Significant All developmel1l that does not fall under one of the categories listed under the <br />development definition of "Limited development "; a special case of "Significant development" <br />is a subdivision that involves more than 5 acres or more than 50 lots (whichever is <br /> more restrictive); this special case is important because regulatory criteria for <br /> communities participating in the NFIP require that the community receive a <br /> detailed floodplain study for any such subdivision within an approximate Zone A <br /> floodnlain <br />Approximate ] OO-year peak flow values estimated for the hydrologic point of interest using <br />hydrology CWCB regression equations or other acceptable approximate hydrologic method <br />annroved by the CWCB <br />Detailed hydrology ] OO-year (and lO,year, 50,year, and 500-year when applicable) peak jlow values <br /> computedfor the hydrologic point of interest using an acceptable detailed <br /> methodology, other than approximate regression equations, such <br /> as an at,site siream gage analysis. a regional stream gage analysis, or a <br /> rainfall-runoff model <br />I Approximate Water surface elevations or flow depths computedfor the location or reach of <br />hydraulics I interest using normal depth flow calculations (i, e. Manning's equation or <br /> slope-area method) or using regional depth-offlow regressions approved by the <br /> CWCB; computer programs such as QUICK-2 and FlowMaster are excellent tools <br /> for normal devth flow calculations <br />I Detailed hydraulics Water surface elevations (base flood elevations) computedfor the stream reach of <br />I interest using a step-backwater computer models, or other acceptable <br />one,dimensional or two-dimensional comvuter model, such as HEC-2 or HEC,RAS <br /> <br />WHEREAS, the corporate limits for Grand Lake have changed since the time when said map <br />was published and are therefore not accurately identified on said map; and <br /> <br />WHEREAS, the Town of Grand Lake has requested an update to their regulatory floodplain <br />mapping to account for changes in corporate limits and to assist with identifying flood prone areas for <br />proposed development activities; and <br /> <br />" <br /> <br />3 <br />