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<br />. <br /> <br />Colorado Water Conservation Board <br />Department of Natural Resources <br />721 Centennial Building <br />1 31 3 Sherman Street <br />Denver, Colorado 80203 <br />Phone: (303) 866,3441 <br />FAX: (3031 866-4474 <br /> <br />STATE Cj COLORI\DO <br />~ <br /> <br />t..p <br /> <br />Roy Romer <br />Governor <br /> <br />James s. lochheild <br />Executive Director, DNR <br /> <br />D;uies C tile, P. E <br />Director, eWeB <br /> <br />October 16, 1996 <br /> <br />Mr. William R. Herbstreit <br />Director, Office of Financial Services <br />University of Colorado at Boulder <br />175 Regents Administrative Center <br />Campus Box 48 <br />Boulder, Colorado 80309,0048 <br /> <br />Dear Mr. Herbstreit: <br /> <br />By letter dated October 4, 1996, the Colorado Water Conservation Board staff provided <br />an account of the floodplain issues which we addressed in our review for the University of <br />Colorado, Boulder, Flatiron Gateway Property Acquisition Proposal in Boulder County, <br />Colorado (copy of my October 4, 1996 letter attached). <br /> <br />We have reviewed the technical floodplain information which has been made available <br />to us regrading the flood hazards on South Boulder Creek in the vicinity of the subject site. <br />This review was in cooperation with the Urban Drainage and Flood Control District (UD & <br />FCD). This a very complex investigation because of the many natural and manmade conditions <br />that exist within the study reach on South Boulder Creek extending upstream of U.S. Highway <br />36. <br /> <br />As stated in our October 4, 1996 letter, our conclusions concerning floodplain issues will <br />be provided under separate cover. This is that communication. Our preliminary conclusions <br />are as follows: <br /> <br />Flood Hazard, A portion of the site is within the 100, year floodplain and a large <br />portion lies within the geological floodplain of South Boulder Creek. The natural <br />floodplain has been greatly impacted due to a number of manmade operations. The <br />major ones are the Flatiron Gravel Mining Operation, the U. S. Highway 36 <br />embankments and downstream subdivision developments. These activities have all <br />impacted the natural flow regime of the stream. <br /> <br />Flood Mitigation Measures, The manmade modifications to the natural flow regime of <br />the South Boulder Creek floodplain requires that certain flood mitigation measures be <br />implemented to reduce downstream flood risks. These mitigation measures may include <br />property buyouts of existing developments, flood warning systems, detention structures, <br />