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<br />BC Brown and Caldwell <br />~ Consultants <br /> <br />7535 East Hampden Avenue <br />Surte 403 <br />Denver. CO 80231-4838 <br />(303) 750-3983 <br />FAX (303) 750-1912 <br /> <br />January 20, 1994 <br /> <br />Mr. Larry Lang, P.E. <br />Colorado Water Conservation Board <br />721 State Centennial Buildin g <br />1313 Sherman Street <br />Denver, Colorado 80203 <br /> <br />City of Greeley, Colorado <br />Request faT' Letter of Map Revision <br />Cache La Poudre River <br /> <br />Dear Mr. Lang: <br /> <br />The City of Greeley is presently designing improvements to their Water Pollution Control <br />Facility (WPCF) located adjacent to the Cache La Poudre (Poudre) River between Ash Avenue <br />and U.S. Highway 85 in Wdd County, Colorado. The WPCF is presently located within the <br />regulatory floodway of the Poudre. The floodplain and floodway are defined by the Flood <br />Insurance Study (PIS) of the :'~ederal Emergency Management Agency in a report entitled "Flood <br />Insurance Study, City of Gnleley, Colorado" dated January 1979. <br /> <br />Brown and Caldwell has undertaken a program to analyze the existing floodplain and floodway <br />of the Poudre adjacent to the WPCF and to detennine f100dway regulatory compliance <br />concerning construction of the new facility improvements. <br /> <br />Since 1979, the date of the FIS study, considerable changes have bem! made which impact the <br />floodway. Most notably are the construction of replacement bridges crossing the Poudre at Ash <br />Avenue and at 8th Street. TlIese bridges cause a reduction in the floodway and lower the 25-, <br />50-, and 100-year water su rface profiles. Additionally, the 100-year floodway is greatly <br />reduced. The magnitude of the changes justifies an application for a Letter of Map Revision <br />(LOMR) to redefme the regnlatory floodplain and floodway. <br /> <br />The accompanying documentation provides a basis for requesting a LOMR. This would remove <br />large areas of the WPCF from the floodway. Additionally, the lowered 100- year flood profile <br />would place plant components that are on naturally high ground out of the floodplain. The <br />resultant regulatory boundaries world permit most of the contemplaited plant modifications, <br />required to meet discharge criteria, to be constructed without violating floodway ordinances. <br /> <br />21-7387' <br />