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<br />--- -- ----~---~------_._._---_._--.. <br /> <br />f. Volume losses. The value!! shown in table 9 indicate that <br />considerable volume was lost to thl! North Platte River during the <br />April to July period. These losse~ were mainly the result of <br />i:t"rigation diversions and they are summarized in table 10. Since <br />all tributary inflow is not accounted for in the table 10 values, <br />the actual losses are somewhat higher. <br /> <br />Table 10 <br />NORTH PLATTE RIVER - 1973 FLOOD <br />VOLUME LOSS SUMMARY APnIL THROUGH JULY <br /> <br />Guernsey <br />Release <br />Plus <br />Laramie River <br />COL. 1 <br /> <br />Wyo - Nebr. <br />State Line2 <br />COL. 2 <br /> <br />Lake <br />McConaughy <br />Change in <br />Storap;e <br />COL. 3 <br /> <br />North <br />Platte <br />COL. II <br /> <br />Total <br />Volume Lostl <br />Guernsey <br />to Mouth <br />COL. 5 <br /> <br />Month <br /> <br />April 137,700 106,100 + 99,800 <br />/ohy 482,300 365,000 + 39,300 <br />June 564,300 355,600 + 27,500 <br />July 432,800 142,900 - 33,600 <br />lCOL. 5 = COL. 1 - (COL. 3 + COL. 4) . <br />2Volume passing Tri-State Dam, Nebraska <br /> <br />33,000 <br />275,100 <br />328,700 <br />120 , 500 <br /> <br />4,900 <br />167,900 <br />208,100 <br />345,900 <br /> <br />14. FLOOD HYDROLOGY - PlATTE RIVE:R <br /> <br />a. General. The North Platte and South Platte Rivers join <br />near North Platte to form the mail\ stem of the Platte River, ;ffiich <br />continues across the State of Nebraska and empties into the <br />Missouri River about 10 miles south of Omaha. Two major tribu- <br />taries empty into this reach of the Platte River - - the Loup <br />River, drainage area 15,200 squarE! miles, and the Elkhorn River, <br />drainage area 6,900 square miles. In the 1973 flood" the <br />combination of the South Platte R:lver and North Platte River <br />flows produced record or near-record flows along the main stem <br />of the Platte River to the lOOuth C,f the Loup River. The Loup <br />and Elkhorn Rivers did not, howevl!r, produce significantly large <br />contributions to the floodflollll C()ming from the upper basin.. As <br />a result, the flood peaks experienced on the Platte River downstream <br />frOlll the lOOuth of the Loup River >rere not unusually high. <br /> <br />b. Peak discharp;es. Peak d:lscharges experienced in the Platte <br />River basin dowm.tream frOlll the Confluence of the North Platte and <br />South Platte Rivers are summarized in table 11. <br /> <br />26 <br />