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<br />AREAS OF POTENTIAL FLOODING <br />The attached mAps, numbered Sheets 1 to 15, illustrate areas subject <br /> <br /> <br />to flooding in the flood plain of the South Platte River from Waterton to <br /> <br /> <br />Brighton, Colorado. Three conditions of potential flooding are illustrated <br /> <br /> <br />and identified in the map legend: (1) Flood discharges equivalent to a <br /> <br /> <br />specific flood discharge which occurred previously, such as the May 1942 <br /> <br /> <br />flood and the MAY 1957 flood. This flood outline is based on existing <br /> <br /> <br />conditions of the channel and flood plain; (2) "lOO-year Frequency Flood" <br /> <br /> <br />representing discharges that have A probAbility of occurrence in anyone <br /> <br />year of one percent; (3) "Standard Pro,1ect Flood" representing discharges <br /> <br />of approximately 40 percent of the maximum probable dischArge potential of <br /> <br />the watershed. The Standard Project Flood outline is suitable for use AS <br /> <br />a guide to the flooding limits which may be expected when future urbaniza- <br /> <br />tion increases runoff from the watershed. <br /> <br />USE OF FLOOD OUTLINES <br /> <br />The flood outlines presented in this report are based on discharge <br /> <br />potentials derived from analysis of historic discharge records, And on <br /> <br />the existing dimensions of the channel and flood plain. However, runoff <br /> <br />patterns are subject to change beCAuse of watershed development. Limits <br /> <br />may also vary in the future if chAnges in the channel and flood plain <br /> <br /> <br />occur. With such potential changes, the flood outlines Are essentially <br /> <br /> <br />reference lines for determining the degree of flood risk. Applications <br /> <br /> <br />to specific locations should be made with full recognition of the potential <br />variations and the more detailed information presented in the full report. <br /> <br />7 <br /> <br />8 <br />