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<br />. <br /> <br />. <br /> <br />A Library search was conducted to uncover other hydrologic <br />reports for the Lake Minnequa basin. The only report available <br />was a 1975 report by Sellards and Grigg, Inc. entitled "Lake <br />Minnequa, Master Storm Drainage and Financing Plan". The <br />Sellards and Grigg report was based on a detailed rainfall-runoff <br />analysis of the basin. Review of the study showed that the <br />existing (l975) lOa-year discharge to Lake Minnequa was estimated <br />to be 1800 cfs and the future full development (date unknown) <br />discharge was calculated to be 4100 cfs. Since little technical <br />information was presented in the study a detailed and complete <br />review was not possible. We did notice however that Sellards and <br />-Grigg used a lOO% pervious value for undeveloped areas whereas we <br />would recommend a value closer to 95%. The lOO% pervious value <br />for undeveloped areas would produce a runoff discharge lower than <br />a value we would recommend. Additionally the only inflow <br />hydrograph presented in the report was for the fully developed <br />condition complete with proposed local detention facilities. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Since no previous hydrologic determination was considered <br />completely acceptable for use in the Pueblo Flood Insurance <br />Study, MSM Consultants, Inc. has developed an independent <br />rainfall-runoff determination for the Lake Minnequa basin. This <br />determination was accomplished using the COE HEC-I computer <br />model. For this analysis precipitation values for the lOa-year <br />storm were calculated from the official City of Pueblo <br /> <br />. <br /> <br />. <br /> <br />-4- <br /> <br />. <br />