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<br />United States'-. GeologlcaC, Sl!rvey '~t:las continued the
<br />operation of the c.ompacf gaging. stations and the analysis
<br />and compilation of the hydrologic data pre.se!lted in this
<br />report and llsed in the-"administration' Of'th'e Gompact. The
<br />Corps of Engineers continued to op~rate the conservation
<br />pool of John Martin -Rese'rvoir In.accor.dance with the terms
<br />of the Compact and the orders of the Administration,
<br />
<br />8, Water Supply, Reservoir Operation, and Hydrologic Data
<br />
<br />The winter storage period, November:l, 1971, through Ma~ch 31,
<br />1972, during compact year 1972.did not produce ,large amounts of
<br />storilge in John Martin Reservoir. The reservoir was empty on
<br />November I, and the storage amounted to only 25,642 acre.feet on
<br />March 31, During the winter storage period. river flow into the reservoir
<br />amounted to 16,500 acre-feet. which was about 7,000 acre-feet less
<br />than the 1949-72 average of 23,385 acre-feet; and outflow amounted to
<br />3,577 acre-feet, which was about.2,600 acre~feet less than the.1949-72
<br />average of 6,206 Jere-feet. An estimate of the u.nmeasured inf.low into
<br />the reservoir was prepared by deducting the river flow from the sum of
<br />the accumulated storage and the outflow, and it. was 12,719 acre-feet.
<br />The actual amount of unmeasured inflow exceeded. this amount by the
<br />amount of the evaporation, Colorado irrigators made demands for
<br />release of 2,979 acre-feet of river flow during the winter storage period,
<br />The accumulated storage in John Martin Reservoir was rapidly
<br />depleted during the summer storage period or irrigation season..Aprill,
<br />1972, through October 31, 1972. Colorado demands, which began on
<br />April 3, for release of 15,025 acre-feet .of stored water and 240
<br />acre-feet of river flow and Kansas demands, which also began on April
<br />3, for release of 10,976 acre-feet of stored water emptied the reservoir
<br />on April 16, Small freshets provided small amounts of storage. during
<br />May, July, and September, Colorado demands for release of, water
<br />stored during these events amounted .to 10,375 acre-feet, and Kansas
<br />demands amounted to 3,016 acre-feet. Colorado again made demands
<br />for release of river flow'beginning on October 31, which amounted to
<br />20 acre-feet. The stateline flow during the days of Kansas demand in
<br />April was 11,230 acre-feet and exceeded the amount of .the demands,
<br />Kansas demands for water stored during the May freshet were for 621
<br />acre-feet while the statelir.e flow was 1,680 acre-feet. Kansas demands
<br />resulting from the July. freshet were 2,395 acre-feet .and the stateline
<br />flow was 2,480 acre.feet. The reservoir was empty at the close of the
<br />compact year on October 31.
<br />The total river flow into the reservoir during the summer storage
<br />period was 97,352 acre-feet, which was about 55,000 acre.feet less than
<br />the 1949-72 average of 152,608 acre~feet. Diversions by the ditches in
<br />Colorado Water District 67 amounted to 129,360 acre.feet during this
<br />period, which was about 22,000 acre-feet less than the average of
<br />151,068 acre-feet. Ditch diversions in Kansas during the same period
<br />amounted to 58,332 acre.feet. The stateline flow during the summer
<br />storage period was 80,000 acre-feet, which is about 58,000 acre-feet
<br />less than the average.
<br />An estimate of the accretions, which includes tributary inflow
<br />and returnflow, into the Arkansas River between John Martin Dam and
<br />the stateline was prepared by deducting the outflow from John Martin
<br />Reservoir from the sum of diversions in Colorado Water District 67 and
<br />the stateline flow, The accretions during the compact year were
<br />145,430 acre-feet, of which 45,761 acre.feet occurred during the winter
<br />storage periOd.,
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