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<br />001535 <br /> <br />PROJECT TITLE: Flood Study of Elbert County (fig. 18) <br /> <br />COOPERATING AGENCIES: Colorado Department of Natural Resources, Colorado <br />Water Conservation Board; and Elbert County <br />Planning Department <br /> <br />PROJECT CHIEF: Theron R. Dosch, District Office, Lakewood <br /> <br />PERIOD OF PROJECT: January 1979 to September 1981 <br /> <br />FPoblem.--Elbert County, located southeast of Denver and northeast of Colora- <br />do Springs, is undergoing rapid residential development without benefit of flood- <br />plain regulations. County officials need flood-plain information that is more <br />accurate than that provided by flood-prone area maps, but detailed flood studies <br />would be too expensive. An intermediate type of study will provide satisfactory <br />information about flood hazards in the county. <br /> <br />Objectives.--Provide flood information, including discharges, flood-plain <br />widths, flood depths, and average flood velocities at selected sites on streams <br />where the width of inundation during a 100-year flood would exceed 60 feet. Coun- <br />ty officials can use the information to evaluate development proposals and estab- <br />I ish flood-plain regulations. <br /> <br />Approach.--Compile existing hydraulic and hydrologic data including histor- <br />ical-flood information. Collect additional data as needed. Compile data on <br />1 :12,000-scale quarter-quadrangle maps made from 1:24,OOO-scale U.S. Geological <br />Survey topographic quadrangles. Provide a set of map positives to Elbert County <br />officials for duplication as needed. <br /> <br />FPogress.--Cross-section characteristics and 100-year flood levels were <br />computed for 93 stream sites in the western one-third of the county. Maps at a <br />1:12,000 scale showing 100-year flood information were completed for 35 quarter- <br />quadrangles. <br /> <br />Plans.--Complete maps for the western 40 percent of the county, which re- <br />quires an additional 14 quarter-quadrangles. Provide aerial photographs to Elbert <br />County to complement the older topographic maps. Complete the text for the maps; <br />the text will explain the causes and effects of cloudburst flooding in this nor- <br />mally arid region. <br /> <br />45 <br />