Laserfiche WebLink
<br />. <br /> <br />. <br /> <br />depth-duration intensity curve and the NOAA Atlas for Colorado. <br />Unit hydrographs used in this determination were calculated using <br />procedures recommended by Urban Drainage and Flood Control <br />District (UDFCD) as is the official policy of the City of <br />Pueblo. Loss rates were calculated using SCS curve numbers and a <br />recent soil survey of the Pueblo area. All curve numbers were <br />checked by an official of the SCS in Denver. The peak laO-year <br />inflow to Lake Minnequa was calculated to be 3400 cfs. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />The Lake Minnequa outflow hydrograph was developed using the <br />Modified PuIs routing method with critical depth calculations at <br />the outflow section. The stage volume relationships were <br />developed from previous work by Sellards and Grigg and the COE <br />and the City of Pueblo 2-foot contour map. The <br />Stage/Volume/Discharge curves developed~ by MSM are therefore <br />similiar to the previous curves. Assuming the lake to be at full <br />stage during the lOa-year flood event, the peak lOa-year outflow <br />discharge was found to be 2400 cfs with a volume of 950 <br />acre-feet. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Although we feel that our hydrologic determination is a <br />justifiable engineering procedure, several problems were <br />encountered during our analysis. We were unable, due to <br />inadequate topographic mapping, to confirm the exact size and <br />shape of the Lake Minnequa drainage basin. <br /> <br />. <br /> <br />-5- <br /> <br />. <br />