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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />effectively reduces the reservoir storage capacity to 1,928 acre-feet. The <br />restriction was imposed due to excessive seepage through the auxiliary <br />spi 11 way di ke and the poor conditi on of the auxi 1 i ary spi 11 way and emergency <br />spillway chute. <br /> <br />In March 1987, the City applied to the Colorado Water Conservation Board <br />(CWCB) for partial funding of a feasibility study to rehabilitate Barnes <br />Meadow Dam. That fundi ng was approved by the CWCB in May 1987. Morri son- <br />Knudsen Engineers, Inc. (MKE) was selected to perform the feasibility study in <br />June of 1987. <br /> <br />The study was initiated by reviewing available reference material on file at <br />the Ci ty of Greel ey and the SED. Thi s i ncl uded the Phase I Inspecti on Report <br />of the National Dam Safety Program, sponsored by the U.S. Corps of Engineers; <br />various hydrological and geotechnical reports; and specifications and drawings <br />of previous rehabilitation work. A list of these references was compiled. <br /> <br />Background information on the City's history, laws, physical assets, and <br />present and future fi nanci a 1 status was gathered. The City's water exchange <br />pl an wi th the North Poudre Irri gati on Company for Col orado-Bi g Thompson (CBT) <br />water was researched. The City's water requirements were assessed as a <br />function of population projections and per capita use rates. The water supply <br />and project yield were determined using the Barnes Meadow total storage right <br />of 2,349 acre-feet. The finn annual yield for Barnes Meadow Reservoir is <br />1,406 acre-feet, but due to the City-imposed restriction is effectively 1,301 <br />acre-feet. The sediment yield in the Barnes Meadow Reservoir drainage basin <br />was estimated at 31 acre-feet, for a 100-year project life. Water quality of <br />the Cache la Poudre River was analyzed and was generally found to be excellent <br />for domestic, municipal, industrial, and agricultural purposes. <br /> <br />Previous work had indicated that the spillway capacity at Barnes Meadow Dam <br />was sufficient to pass the probable maximum flood (PMF), as required by the <br />SED for high hazard dams at that time. A hydrological analysis of the <br />drainage basin was performed to verify that fact. A PMF for the local storm <br />(thunderstonn) was developed using the latest revision to NOAA <br /> <br />why IQe..o-l <br />_~7 <br /> <br />E-2 <br /> <br />115lc <br />