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<br />.....,.;' <br />2,i.hP. <br /> <br />duration flash floods of damaging intensities. The recorded annual normal precipitations <br />within the watershed vary from 9 to 19 inches. Because of the variation in altitude, the <br />mean annual temperatures range from 37 to 54 of, and the extremes range from -54 to 105 <br />of. <br /> <br />RESERVOIR OPERATIONS <br /> <br />The reservoir is a multiuse facility having (following values are from May 1993 area-capacity <br />tables): <br /> <br />. 131,504 acre-feet of surcharge storage between elevations 4898.70 and 4919.00 <br /> <br />. 27,044 acre-feet of flood control storage between elevations 4893.79 and 4898.70 <br /> <br />. 65,716 acre-feet of joint use storage between elevations 4880.54 and 4893.79 <br /> <br />. 229,059 acre-feet of conservation storage between elevations 4796.70 and 4880.54 <br /> <br />. 25,792 acre-feet of inactive storage between elevations 4764.00 and 4796.7 <br /> <br />. 2,329 acre-feet of dead storage between elevations 4752.80 and 4764.00 <br /> <br />Records for Pueblo Reservoir show a calculated average unregulated inflow of 595,355 acre- <br />feet per year. The estimated mean annual runoff from the basin is 2.06 inches. Since normal <br />operations have begun, Pueblo Reservoir operation has ranged from a minimum end-of-month <br />elevation of 4873.4 in water year 1987 to a maximum elevation of 4887.1 in water year 1986. <br />The inflow and end-of-month stage records in table 1 show the extreme annual fluctuation <br />of the reservoir. <br /> <br />SURVEYS <br /> <br />Original Survey <br /> <br />The original sediment ranges were surveyed by the Bureau of Reclamation prior to <br />inundation of water behind Pueblo Reservoir dam and are referred to as the original, or 1974, <br />data. For future reference, Table 3 lists the local and state plane coordinates for the range <br />line end points. Several of the ranges had portions of them resurveyed prior to inundation <br />to account for construction borrow pit areas. The fmalized original range line data used the <br />resurvey data. Figure 4 illustrates the range line network for Pueblo Reservoir. <br /> <br />The original surface areas for Pueblo Reservoir were determined by planimetering <br />topographic maps of the reservoir area developed prior to inundation-Map Numbers 382- <br />706-2270 to 382-706-2290. The topographic maps have a scale of 1 inch equals 400 feet and <br />a 5-foot contour interval. This study used these maps for digitizing the affected segmented <br />areas as described in the reservoir area and capacity section. <br /> <br />3 <br />