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<br />construction of Center Avenue.) As the pond fills, flow will <br />discharge through the BNRR embankment via bath the new culverts and <br />the restricted opening located at the existing culvert. The <br />restriction preliminarily designed for the 78-inch diameter culvert <br />for the recommended improvement plan shall be removed and the pipe <br />allowed to be fully effective. A berm through the center of the <br />pond will be necessary to provide cover over the existing 18-inch <br />trunk sewer and 30-inch waterline, Which run west to east and <br />parallel one another. The berm will confine runoff to the south <br />portion of the pond until an elevation of approximately 4985.5 is <br />reached at which paint runoff will spill over into the north <br />portion. <br /> <br />A preliminary routing analysis of the proposed pond and outlet <br />determined the following de~ign data for the lOO-year event. <br /> <br />.. <br /> <br />Peak Storage Volume - 164 Acre Ft. (at 2.5 hours) <br />Maximum water surface Elevation - 4991.5 ft. <br />Pond Ar~a - 28.5 acres <br />Invert Elevation of Primary Outlet - 4978.5 ft. <br />Invert Elevation of 27-inch Orifice - 4979.0 ft. <br /> <br />,. <br /> <br />,. <br /> <br />The center Avenue crosslng has been sized aG five 9-foot wide <br />by 5-foot high boxes with an assumed head water dC'pth of seven <br />feet. The preliminary invert and road elevations are 4985.5 and <br />4994.0, respectively. <br /> <br />'- <br /> <br />,. <br /> <br />" <br /> <br />REFERENCES <br /> <br />1. <br /> <br />Spring Creek Major Drainageway Plan, Fort Collins, Colorado, <br />prepared by Gingery Associates, 1nc., August 1980. <br /> <br />,. <br /> <br />Report on storm Water Drainage vacilitie>;, Fort Collins, <br />Colorado, prepared by BlaCk and Veatch Consulting Engineers. <br />June, 1971. <br /> <br />,. <br /> <br />Grigg, 8othan, Rice, Shoemaker and Tucker Urban Orainage and <br />Flood Control Projects: Economic, Legal. and Vinancial <br />Aspects, July 1975. <br /> <br />Preliminary Bridge Hydraulics Report for Prospect street at <br />Spring Creek, prepared by Centennial Engineering, March 1986. <br /> <br />HEC-2 Data, Spring Creek at Riverside Avenue, prepared by the <br />City of Fort Collins, May, 1985. <br /> <br />Cedat" Village outfall SWMM Data, prep3red by the city of Fort <br />Collins, November, 1985. <br /> <br />UDSWMM2-PC Users Manual prepared by Boyle Engineering <br />Corporation, March, 1985. <br /> <br />U.S. Army Corps of Engineers, HEC-2 Water Surf3ce Profiles, <br />Users Manual, September, 1982. <br /> <br />9. Zoning Map, city of Fort Colli.ns, 1986. <br />" <br />