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<br /> <br />United States Department of the Interior <br /> <br />IN REPLY REFER TO, <br />Mr. Larry Lang <br /> <br />Colorado Water Conservation Board <br /> <br />1313 Sherman Street, Rm 721 <br /> <br />Denver, CO 80203 <br /> <br />U.S. GEOLOGICAL SURVEY <br />Box 25046 M.S. 4-1 V-- <br />Denver Federal Center <br />Denver, Colorado 80225 <br />June 11, 1998 <br /> <br />Dear Mr, Lang: <br /> <br />Enclosed is a copy of a study "Regional Paleoflood Investigation to Assess Topographic Effects of <br />the Palmer Divide on flooding in Eastern Colorado," which has just received USGS Director's <br />approval for submission to ASCE's Journal of Hydrologic Engineering. The study was conducted <br />to assist dam-safety officials and flood-plain managers in assessing the spatial variability of <br />large floods in eastern Colorado, Paleoflood techniques were used to estimate the magnitude and <br />approximate ages of prior maximum flooding from evidence preserved in the floodplain, A <br />hypothesis was tested to assess the effects of topography on flooding in streams draining from <br />the Palmer Divide. Paleoflood data can be used to complement meteorologic, hydrologic, and <br />engineering methods to improve estimation of the magnitude and frequency of floods. Study <br />results provide ideas to help resolve flood hydrology issues in eastern Colowdo and specifically <br />for Cherry and Box Elder Creeks. The results of this study also are being used to help improve <br />flood-regression relations being developed for eastern Colorado by Ed Vaill of the U.S. Geological <br />Survey for the Colorado Department of Highways, If you have any questions or comments, <br />please call me at 303-236-6447. <br /> <br />~~ <br /> <br />Robert D. Jarrett <br />Hydrologist <br /> <br />encl. <br />cc: Urban Drainage and Flood Control District <br />City of Greenwood Village, Colorado <br />Colorado Department of Highways <br />Colorado Division of Water Resources <br />Corps of Engineers, Omaha <br />Federal Emergency Management Agency, Denver, Washington, D,C, <br />CH2MHILL <br />Dr. Ed Tomlinson, Applied Weather Associates <br />Dr, Robert McGregor. Water and Waste Engineering <br />Nolan Doesken, Assistant State Climatologist <br />USGS, Colorado District <br />