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<br />(j'H'1'7t1
<br />LI'Ie "
<br />
<br />2
<br />
<br />that show the develo~ment ot irrigation b~
<br />drainage aress and by States.
<br />This report was prepared by Bruce R.
<br />Colby and Roy E. Oltman. hydr~ullc eng!neer3,
<br />under the general supervision of R. w~
<br />Davenport, ehler, Division of Water Utili_
<br />zation.
<br />
<br />DISCHAROE
<br />
<br />As the term Is used in th~s report, dIs-
<br />charge ts the actual stream flow In a surface
<br />channel and refers to a rate of dIscharge
<br />unless volume of discharge 18 specifically
<br />ment10ned. The natural (unregulated) flow of
<br />the stream may be so greatly modified by
<br />diversions and by storage that it bas little
<br />relatIonship to discharge.
<br />Base Perlod for Dlsch8r~e ComparIsons
<br />The discharge of MiSsouri River Bnd most
<br />of its trIbutarIes varies widely from one
<br />rear to another and from a aerIes of dry
<br />years to Q serIes or wet years. hence a com-
<br />puted Qverage discharge of any of these
<br />st~eams depends materIally on the period used
<br />in the computation. As the co~puted average
<br />discharge! of any two streams are not dir_
<br />ectly comparable unless they are based on
<br />
<br />records rar the same period of years, the
<br />perIod or six consecutive water years begin-
<br />nIng October 1, 1937, and endIng September
<br />30, 1943, was selected for this study.
<br />
<br />\..;'1
<br />
<br />Table 1 contains a lIst of 29 gaging
<br />stations that have 23 yeors or marc of
<br />stream-flow records. Those records were used
<br />as a guide to selection of a base period for
<br />comparing dIscharge throughout the MIssouri
<br />River Basin. The base perIod was chosen to
<br />include a group of rec-pnt yesrs, for in re-
<br />cent yearo the discharge records are both
<br />more accurate and more plentIful. Only
<br />continuous periods were considered. Another
<br />requirement was that the base period be long
<br />enough to give s reasonably stable aversge
<br />diSCharge. Runoff was low during most of the
<br />years from 1930 to 19J9, so that not more
<br />than a few years of record fro~ this perIod
<br />could be included in Ule base period.
<br />
<br />1
<br />
<br />Average discharge at most of th~ 29
<br />stations wss computed for con~lnuous periods
<br />or 4 to 10 years ending Septe~ber 30, 1944,
<br />and tor continuous periods of 4 to 7 years
<br />ending September 30, 1943. When the average
<br />discharges for each of these 4- to lO-year
<br />periods were compared w1th th~ average dis-
<br />charges for the entire periOd' of record, the
<br />average discharges for the si~ consecutive
<br />
<br />'.1.
<br />::-.....
<br />
<br />Taela l.--Aver~ge discharge at gaging stations having long records
<br />
<br />.......-
<br />
<br />Gaging statIon
<br />
<br />Beaverhead R1ver at Barratts, )lont.
<br />Missouri River at Fort Benton, Kant.
<br />Madieon River at West Yellowstone, Mont.
<br />Judith River near Utica, Mont.
<br />Wusse15hell River at Harlowton, Mont.
<br />
<br />Yellowstone River at Corwin Springs,
<br />Mont.
<br />BiEhorn River at Thermopolls, -'0.
<br />Bull Lako Croek near Lenore, wyo.
<br />Po~der River at Arvada, Wyo.
<br />Cannonball River at Brelen (near Timmer),
<br />N. Dak.
<br />
<br />North Platte River at Saratoga, Wyo.
<br />North Platte River below Guernsey, wyo.
<br />La Prele Creek near Douglas, Wyo.
<br />LaramIe River neST Jel~, Wyo.
<br />Little Laramie Rlv~r near Fillmore, Wyo.
<br />Blue Creek near Lewellen, Nebr.
<br />South Platte River at South Platte, Colo.
<br />
<br />South Platte River at Juleeburg, Colo.
<br />South Boulder Creek near Eldorsdo Springs,
<br />Colo.
<br />St. Vraln Creek at L,ana, Colo.
<br />
<br />Cache la Poudre River near Fort Collins.
<br />Colo.
<br />KiddIe Loup River st St. Paul, Nebr.
<br />Kansas River at Bonner Springs, Kane.
<br />Smoky Hill River at Ellsworth, gans.
<br />Solomon River at Niles, Kans.
<br />
<br />Big Blue River at Randolph, Kan~.
<br />Osage River near Ottawa, Kans.
<br />Osage River near Bagnell. Mo.
<br />Gasconade River at Jerome, Mo.
<br />
<br />Avera2e discharRe
<br />["ength of'l.-er..l.Q ~1. a r .,ear",
<br />ecord 1n record 1938-43
<br />years (cf's)
<br />
<br />'V"
<br />8,201
<br />469
<br />61
<br />181
<br />
<br />Period or record
<br />
<br />'"U.-44
<br />1882-1944
<br />1914-44
<br />1920-32.1935-44
<br />1907-29 ,1932,1935-"4
<br />1890-93,1911-44
<br />1901-5.1911-44
<br />1918-44
<br />1917-44
<br />1904-8,1912-18,1922-27
<br />l.9a9-~1.UI34., 1935-4.4
<br />1904-44
<br />1901-44
<br />1920-44
<br />1905.1911-4"
<br />1903,1912-26,1934-44
<br />1921-44
<br />IBB8-91,lB96Jl897.1809
<br />1901-44
<br />1902-44'
<br />1896-99,1905,190'7_1944
<br />1888-91,1896-1903.1905
<br />1908-44 -
<br />1884-1944
<br />
<br />1895-1915,1929-44
<br />1918-44.
<br />1896-1904,1919-25.
<br />1928-44
<br />1898-1903,1918-44
<br />1918-44
<br />1903-5,1920-44
<br />1881-1944
<br />1904,1905,1916-44
<br />
<br />~~
<br />31
<br />23
<br />34
<br />
<br />3B
<br />
<br />39
<br />27
<br />28
<br />32
<br />
<br />41
<br />..
<br />25
<br />35
<br />27
<br />24
<br />51
<br />43
<br />43
<br />50
<br />
<br />61
<br />
<br />37
<br />27
<br />33
<br />33
<br />27
<br />2B
<br />64
<br />31
<br />
<br />6,~~~
<br />419
<br />46
<br />141
<br />
<br />2,960
<br />1.910
<br />288
<br />445
<br />184
<br />
<br />2,900
<br />
<br />1,400
<br />224
<br />273
<br />221
<br />
<br />1,239
<br />2,077
<br />42
<br />168
<br />106
<br />78
<br />311
<br />484
<br />11
<br />133
<br />
<br />917
<br />1,450
<br />37
<br />144
<br />93
<br />71
<br />391
<br />507
<br />77
<br />
<br />.~::.>:I,
<br />."
<br />
<br />"
<br />..'.
<br />
<br />126
<br />
<br />420
<br />
<br />374
<br />
<br />1,3~0
<br />5,432
<br />216
<br />492
<br />
<br />1,050
<br />6,110
<br />267
<br />555
<br />
<br />1,254.
<br />565
<br />9,506
<br />2.553
<br />
<br />1,420
<br />599
<br />9,840
<br />2,600
<br />
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