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<br />OiJn:;:~ <br /> <br /> <br />Thl' Big Blue River i~ a tributary of the <br />l\anS<ls River with thdr conlluencc loo.:atcd ncar <br />.\lanhatlan. Kansas. The mainstcm runs generally <br />south through Nebraska near thl' eastern edge of the <br />basin and is joined by OWl' a dOlcn tributaries. <br />Tributaries for the most pari lit' on the .....cst silk of <br />the mainstem in the UPpl'f part of the basin. The main <br />channel b. mOTt' centrally ]o,,:aleJ in the low...r pori ion <br />of the basin below Wilber. <br /> <br />Upper Teaches of thl' streams are characterized <br />by small meandering channels with intt'fmittcnt nows. <br />The stream now is variable being primarily daived from <br />precipitation runoff. The Big Hlue River and its tribu- <br />taries have a relatiVl.'ly low base llow. Return nows <br />from iOl.:reased well irrigation during recent years <br />have lengthened the- period of time whe-n !lows <br />are present in many of these- streams. The slope- of <br />the lowt"r portion of lhe mainstem is less than <br />three feet per mile producing mostly nonerosi\'e <br />Ilow velocities. <br /> <br />Tilt' greakst volume of strt'amllow normally <br />OCellI"!> during the highc:r rainfall months of <br />May, June and July. Figurt' 3 shows <br />the monthly distribution for lhe Big B!Ul' Rivt'r <br />at Harneston for thl' 1933-65 pc:riod. (fll <br />This station has the longest period of record <br />of those in the basin and tht' runoff <br />pattern is quite typical of tht." streams <br />in tht' basin. <br /> <br />STREAMFLOW <br />