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<br />John Martin Reservoir supplies water to irrigated lands as far downstream as Garden
<br />City, Kansas. Current reservoir operations for conservation storage and release follow the plan
<br />adopted by the Arkansas River Compact Administration in 1980, as amended. Releases for
<br />irrigation and delivery normally are made between April 1 and October 3l of each year. Inflow
<br />is stored in November through March except for releases required for flood control. Flood
<br />control operations begin when John Martin Reservoir storage exceeds an elevation of 3,85l
<br />feet. The current operational channel capacity of the Arkansas River is approximately 3,000
<br />cubic feet per second (cfs) at Coolidge, Kansas. (Actual release from the dam may exceed
<br />3,000 cfs when flows are expected to diminish before reaching Coolidge due to irrigation
<br />withdrawal or transit loss).
<br />
<br />To illustrate the flood control function of John Martin Dam, Table 2-llists the largest
<br />mean discharge per year at USGS stream gaging stations upstream and downstream of tile dam
<br />in 1942 through 1999. Annual hydrographs ofrecentyears (1985,1987,1995, and 1999) when
<br />John Martin Dam releases exceeded 2,900 cfs are depicted in Figures 2 through 5, respectively.
<br />
<br />Table 2-1. Largest mean daily discharges (cfs) per calendar year at USGS stream gages on the
<br />Arkansas River above and below John Martin Dam (JMD), 1942 to 1999. Events exceeding
<br />2,900 cfs below the dam are in bold typeface. (Data from USGS).
<br />Las Below Annotation for discharges greater than 2,900 cfs
<br />Year Animas' JMD Lamar Granada Coolidge below John Martin Dam
<br />1942 33,400 33,400 Major flood event trom above JMD (dam not
<br />operational)
<br />
<br />1943 952
<br />1944 4,600
<br />1945 1,750
<br />1946 2,440
<br />1947 5,060
<br />1948 1,280
<br />1949 14,310 1,320
<br />1950 8,110 1,190
<br />1951 7,020 1,220
<br />1952 1,304 1,230
<br />1953 15,790 1,840
<br />1954 17,346 1,020
<br />1955 72,100 1,260
<br />1956 6,451 1,410
<br />1957 16,880 1,370
<br />1958 6,040 1,220
<br />1959 731 1,170
<br />1960 2,575 1,230
<br />
<br />],380
<br />4,510
<br />
<br />Spring runoff trom above JMD
<br />(Channel capacity ~ 15,000)
<br />
<br />943
<br />1,510
<br />4,910
<br />
<br />Spring runoff from above JMD
<br />(Channel capacity ~ 15,000)
<br />
<br />685
<br />9,260
<br />1,010
<br />787
<br />293
<br />1,260
<br />2,400
<br />1,130
<br />
<br />Local storm above Lamar
<br />
<br />276
<br />28,900 Large local storm between Lamar & Coolidge
<br />1,340
<br />2,710
<br />4,280 Local storm between Lamar & Coolidge
<br />5,310 Local storm between Lamar & Coolidge
<br />4,230 Local storm above Coolidge
<br />5,050 Local storm above Coolidge
<br />2,380
<br />2,270
<br />829
<br />
<br />715
<br />996
<br />
<br />continued
<br />
<br />4
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