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<br /> <br />10 <br /> <br /> <br />The 1884 flood was estimated to have a volume of 30,450,000 acre- <br />feet. The flood occurred from May 3 through August 22. When the <br />inflow design flood was developed, the period of the flood was <br />extended from April through the end of August. The resulting flood <br />hydrograph is quantified in table 1.4 and shown on figure 1.2. <br /> <br />Table 1.4.--0riginal 1930 inflow design flood hydrograph <br />for Hoover Dam <br /> <br /> Mean <br /> Volume monthly flow <br />Month (acre-feet) (ft3/s) <br />April 2,000,000 33,610 <br />May 5,000,000 81,320 <br />June 11,850,000 199,160 <br />July 11,350,000 184,590 <br />August 3,000,000 48,790 <br />April-August 33,200,000 <br /> <br />2. Review of Flood Control Requlation - Colorado River Basin, <br />Hoover Dam, by Corps of Engineers and Bureau of Reclamation, <br />July 1982. <br /> <br />This report is a review and update of flood information since the <br />closures of Hoover and Glen Canyon Dams. The Corps concluded that, <br />with the reservoir conservation space in the Colorado River Basin <br />now filled, the potential for damaging flood control releases from <br />Hoover Dam exists. For many years the flood control operation plan <br />for Hoover Dam had incorporated a target maximum release of <br />40,000 ft3/s. However, encroachment in the floodplain below Hoover <br />Dam has significantly reduced that figure to about 28,000 ft3/s, <br />which has been estimated as the maximum release that will not damage <br />inhabited structures downstream. <br /> <br />3. Boulder Canyon Proiect Final Reports, Part IV - Design and <br />Construction, Bulletin 3, Diversion, Outlet, and Spillway <br />Structures and Boulder Canyon Proiect, Final Report, Part I, <br />1946. <br /> <br />These reports presented the original design criteria for Hoover Dam <br />(Boulder Dam). The total outlet capacity of Hoover Dam at the <br />completion of construction was 520,000 ft3/s. The spillways had a <br />capacity of 400,000 ft3/s: the outlet works could pass 100,000 ft3/s: <br />and the powerplant had a capacity of 20,000 ft3/s. <br />