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<br />STATE OF COLORADO <br /> <br />Colorado Water Conservation Board <br />Department of Natural Resources <br />1313 Shennan Street, Room 721 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3441 <br />FAX, (303) 866-4474 <br />www.cwcb.state.co.us <br /> <br />Q <br /> <br />MEMORANDUM <br /> <br />Bill Owens <br />GovetTlor <br /> <br />TO: <br /> <br />Rod Kuharich <br />Dan McAuliffe <br /> <br />Greg E. Walcher <br />Executive Director <br /> <br />Rod Kuharich <br />CWCB Director <br /> <br />FROM: <br /> <br />Larry Lang <br />Joe Busto <br /> <br />Dan McAuliffe <br />Deputy Director <br /> <br />DATE: <br /> <br />June 6, 2001 <br /> <br />RE: <br /> <br />Chatfield Reservoir Reallocation Study Minutes from May 31, 2001 <br /> <br />Attendees <br />George Cotton - Earth Resources Inc. <br />Rick Miner-USACE <br />Jeff McClenathan- USACE <br />Bob Simons - Simon and Associates <br /> <br />Brad Piel- Foster Wheeler Environmental Corp. <br />Doug Clemetson - USACE <br />Larry Lang and Joe Busto - CWCB <br /> <br />* For additional info see listing of technical memos presented to the CWCB and USACE <br /> <br />Hvdrolol!V and Hvdraulics <br />The bulk ofthis six-hour meeting was to present Hydrology & Hydraulic analysis to the Corps <br />and CWCB to get a handle on increased storage for reservoir operations and create a <br />comprehensive downstream defendable river model. George Cotton has done a thorough <br />analysis of available data and done his best to string all the existing modeled reaches together. <br />Additional tweaks and increments of time will be needed but the Corps best H&H people seemed <br />confident with the results from the analysis with a little more calibration. George Cotton <br />presented his statistical analysis of the stream gages, evaporation, and precipitation downstream <br />of the reservoir. He had accumulated all available data along South Platte River and drew <br />comparisons from turn of the century to the present. Trends have shown that urbanization has <br />led to more annual stream flow in the South Platte River and it is particularly evident since 1969. <br />Particular years of interest were the wet years of 95 and 97 on the Platte River. The trend is that <br />the low flows are getting bigger and the big flows are more numerous. Peak flows are still the <br />same but there are a lot more of them. <br /> <br />He also created a database of precipitation values from 4 stations Lakewood, Edgewater, Cherry <br />Creek Dam and the Stapleton gage, which operated from 1900-1975. They are using the state <br />formula for evaporation which is an average monthly value that is calculated to the Chatfield <br />site. <br /> <br />Channel Routinl! <br /> <br />Flood Protection. Water Project Planning and Financing. Stream and Lake Protection <br />Water Supply Protection. Conservation Planning <br />