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<br />It 1s some'~at difficult to quickly summarize the availability of
<br />vater because situations vary so ~dely throughout the Basin. Basically,
<br />In assembling hydrologic information, over 500 gaging stations that had
<br />records of over 10 yeaTS _ere analyzed and data recorded for the planners.
<br />To give scme idea of the variability of runoff the above chart shows the
<br />recorded annual runoff at Hermann, Missouri, which is the most dovnstream
<br />gaging station 1n the Missouri Basin from 1900 through current times. It
<br />will be noted from the chart the mediaD water supply for the period of
<br />record 1s nearly 60 million acre-feet. The flood yeaTS of 1915, 1927,
<br />1940's, 1951, and 1952 naturally show the highest runoff. Also of signi-
<br />ficance are the droughts of the 1930's and that of the mid-1950's, though
<br />during this latter period many of the reservoirs on the main stem and the
<br />tributaries ~ere being initially filled, which reduced flo~s during this
<br />period.
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<br />Water use has been developing since the mid-1800's and' the rate at
<br />which development has been progressing has increased rather rapidly in
<br />the recent years. Thus, a record of streamflov as 15 shovn at Hermann
<br />does not correctly shov the availability of Yater because of the depleting
<br />effect of further development vith time. Thus, only the most recent records
<br />indicate the full depletions. Recognizing this, the HYdrology Work Group
<br />undertook to estimate the growth of the depletions and to prOvide corrected
<br />records of historic flovs as adjusted by subsequent depletions for over 100
<br />stations io the Missouri Basin. These are largely located near the lower
<br />end of HYdrologic Basins vhich might be used for planning purposes. The
<br />depletions have been summarized for the major subbasins in the Missouri
<br />Basin and the folloving chart indicates the current depletion of about
<br />7-1/2 million acre-feet. lt vill be noted from the chart that irrigation
<br />1s the largest user of vater, folloved by reservoir evaporation.
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