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<br />, <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Most of the flood plain on Coal Creek and Rock Creek is used for <br /> <br /> <br />agri ultural purposes; however, the flood plain does extend into the <br /> <br /> <br />comm nities of Superior, Louisville, Lafayette, and Erie. The flood <br /> <br /> <br />plai varies in width from about 300 - 600 feet in the steeper areas, to <br /> <br /> <br />over 2000 feet in the flatter areas. <br /> <br />FLOOD HISTORY <br /> <br />occu <br /> <br />thun <br /> <br />Storms which produce floodwater occur during May through September. <br /> <br /> <br />Duri g this period, warm, moist air masses from the Gulf of Mexico <br /> <br /> <br />comb ne with cold and comparatively dry air from the polar regions to <br /> <br /> <br />caus thunderstorms. The storms are usually characterized by high <br /> <br /> <br />rain all intensities of short duration, producing high peak flows and <br /> <br /> <br />te volumes of water. Frequently, the thunderstorms are seVere and <br /> <br /> <br />over rather limited areas. Floods are especially severe if the <br /> <br /> <br />rstorms follow a period of high snowmelt or prolonged rainy weather. <br /> <br />due <br />Majo <br />stru <br />the <br /> <br /> <br />istorical documentation of flood damage is meager. This is probably <br /> <br /> <br />'the small size of the streams and the lack of extensive urbanization. <br /> <br /> <br />flood damages'in the watershed are to roads, bridges, irrigation <br /> <br /> <br />ures and agricultural land. Duration of flooding is brief due to <br /> <br />, <br />eep slopes and small size of drainage area. In general, peak <br /> <br /> <br />last from I to 4 hours during a flooding period of from 6 to 24 <br /> <br />hour <br /> <br />- 6 - <br />