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<br />T.l\BLEJ <br />MISSOURI RIV,ER DISCI!ARGE COMPARISONS <br /> <br />1964 Fl~od 1953 Flood 1908 Flood <br />Stage Q Stage Q Stage Q <br />(feet) cfs (feet) cfs (feet). E!! <br /> <br />14.0726,500 ' (1)17+ NA NA NA <br />NA80,ooo . 'Nr 66,600 NA NA <br />13.44 .77,400 13.5778,700 (2)18.5 140,000 <br />21.30 105,000 23.4 122,000 25.4 NA <br />19.75 115,000 22.2 137,000 NA NA <br /> <br />Missouri R.Station <br /> <br />Near Ulm <br />Near Great Falls. <br />At Fort Benton <br />At Virgelle <br />Near Zortman <br /> <br />- <br />(1) From information by local residents <br />(2) Based on information from local residents that 1908 flood exceeded <br />1953 stage by about 2 feet. <br /> <br />,e. Preliminary bydrographs on the Missouri River at Morony Dam <br />near Great Falls and at the U.S.G.S. VirgelleStation have been esti- <br />mated from available stage data' and preliminary rating curves. These <br />bydrographs are shown on plate 5 and the comparative data for the 1908 <br />and 1953 events. are given in "table 3. . <br />" <br />, <br /> <br />18. RUNOFF <br /> <br />A preliminary estimate was made of the surface runoff volume from <br />the area lying between Canyon Ferry Dam and the Virgelle U.S.G.S. station. <br />This estimate is base.d on the incremental inflow between Canyon Ferry <br />and Virgelle and below Tiber Dam. The volume of surface runoff estimated ,I <br />from this area is~,OOO acre-feet ~n a 10~day period which is an aver- <br />age of about 0.75 inch from the 13,550 Sqllare mile area. An estimate <br />of the surface n:.noff into Tiber Reservoir was also made using the inflow <br />bydrograph shown on plate 4. . Considering a contributing drainage are.a <br />to this point of 4,923 square miles, the surface runoff computes to 1.15 <br />inch or .?69, 000 .acre-feet. This is from an estimated average rainfall <br />over this area of about.6 inches. <br />- <br /> <br />19. METEOROLCGY <br /> <br />On 7 June 1964 a ~asi-stationary front was orientated approxi- <br />mately northwest-southeast along the Continental Divide across Montana. <br />Further south a deepening surface low was slowly moving northeastward <br />across the. southern Wyoming-northern Colorado area, with a cold front <br />aloft sweeping eastward across Montana and Wyoming. The upper air flow <br />pattern was predominately from the southwest over the surface low just <br />prior to the storm, but a closed circulation aloft developed in con- <br />junction with the surface low. This cyclonic circulation resulted in <br />easterly winds across the Rocky Mountains in Montana. This condition <br /> <br />9 <br />