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Platte River Ecosystem Resources and Management, with Emphasis on the Big Bend Reach in Nebraska


Tables

Table 19. Instream flow shortages (thousand acre-feet (kaf)) at Grand Island sorted from highest to lowest and based upon the comparison of each daily flow with USFWS instream flow recommendations (IFR) (daily flow targets) (M. Butler, USFWS, personal communication).


Period		 10/1- 11/15 11/16- 1/31 2/1- 2/14 2/15- 3/15 3/16- 3/22 3/23- 5/10 5/11- 5/19 5/20- 6/20 6/21- 9/15 9/16- 9/30
Total
Mean IFR, cfs 1800 1000 1800 3350 1800 2400 1200 3000 1200 1000 Annual
Total kaf 164.2 152.7 50 192.7 25 233.3 21.4 190.4 207.1 29.8 1266.5
1978 80.6 27.7 23.8 103.8 0 71.5 4.4 159.6 187.5 16.7 675.6
1976 91 3.8 9.5 89 0.2 73.2 6.8 148.6 191 12.7 625.8
1943 119.4 25.2 0.4 98.6 18.2 56.7 0.9 97.7 172.3 29.2 618.6
1944 129.5 23.5 19.2 80.4 5.4 45.2 0 96.2 179.5 26.2 605.2
1948 87.2 9.8 20.4 70.1 0 64.8 7.3 174.7 139 22.6 595.8
1965 102 33.6 19.2 119.5 7.1 129.5 13.5 84.3 86 0.4 595
1968 48.8 12.7 9.8 93.7 6.8 126 5.4 152.7 131.6 5.2 592.5
1982 88.4 5.2 8.9 73.8 0 125.3 7.4 132.9 139.7 3.9 585.6
1989 77.8 3.2 12.5 74 0.5 154.4 15.2 169.9 73.4 1.1 582.1
1967 75.9 18.7 8.1 119.8 11.3 174.2 12.5 75.1 81.4 2.8 579.8
1979 108.2 27.2 28.6 87.9 0 56.8 1.4 144.1 95.6 18.5 568.1
1960 75.4 20.4 1.7 114.5 2.5 43.2 0.3 114.6 156.8 29.8 558.9
1945 95.6 12 15 86.2 9.6 132.4 3.2 63.9 127.3 13 558.1
1975 82.9 15.8 18.5 102.1 0.1 87.4 5.2 131 112.2 0.9 556.1
1977 95.5 22.5 16.8 121 1.2 46 0.6 95 140.9 8.6 547.9
1990 81.9 22.6 7.1 84.9 1.2 36.2 0.7 125.2 153.3 19.3 532.4
1966 0 1.9 4.5 59.4 0 42.7 11.8 169.6 181.1 17.5 488.6
1950 43.7 16.5 6 78.2 1.9 64.3 0.2 114.7 128.2 12.8 466.4
1962 54.3 15.5 0.1 98.6 0 102.5 16.6 69 93.2 10.7 460.4
1969 55.5 14.9 9.1 76 0 83.1 4.9 127.4 83.8 1.9 456.6
1947 34 14.7 20.2 88.4 0 83.9 6 114.7 78.2 10.7 450.7
1958 78.8 6.2 20.4 96.5 2.1 27.5 0 36 136.5 27.2 431.2
1949 102 17.7 23.2 48.3 1 19.3 0 43 95.9 7.8 358.2
1970 24.6 1.3 0 52.7 0 11.8 0 114.6 124.1 0.2 329.3
1972 19.5 2.3 0.7 13.5 0 42.5 0 107.2 127.9 12.1 325.7
1974 0 0 0 0 0 0 0 109.2 173 14 296.2
1988 13.5 0.9 0 17.6 0 36.3 0 117.3 106.8 0 292.2
1951 46.2 13.7 15.4 63.1 0.3 66.7 3.5 45.6 35.2 0 289.7
1980 120.4 6.8 2.2 8.7 0 0.3 0 0 129.7 10.2 278.4
1952 13.8 1.4 0 20.3 0 7.5 0 72.6 130.4 26.2 272.3
1971 27.9 3.8 2.1 46.2 0 18.8 0 0 100.6 7.4 206.8
1985 0 0 0 4.9 0 20.7 0 86.6 80.6 0 192.8
1986 8.7 2 5.1 25.2 0 0.1 0 67.7 8.8 0 117.6
1987 0 o 0 57 0 0.2 0 1.5 47.5 0 106.2
1983 71.5 0 0 17.1 0 0.1 0 0 0 0 88.7
1984 26.8 0 0 0 0 0 0 0 56.8 0 83.5
1973 15.1 0.6 0 13.5 0 0 0 0 26.2 0 55.4
mean shortage, kaf 59.4 10.9 8.9 65 1.9 55.4 3.5 90.9 111.1 10 416.9

Dry Years

Period		 10/1-
11/15		 11/16-
1/31		 2/1-
2/14		 2/15-
3/15		 3/16-
3/22		 3/23-
5/10		 5/11-
9/15		 9/16-
9/30
Total
Dry IFR, cfs 1,300 600 1,200 2,250 1,200 1,700 800 600 Annual
Total kaf 118.6 91.6 33.3 129.4 16.7 165.2 203.1 17.9 775.8
1956 99.6 17.3 10.7 63.3 1.9 96.2 198.7 17.9 505.5
1957 117.7 56.0 16.2 93.4 6.4 74.9 100.5 2.2 467.3
1955 79.2 4.0 7.0 42.2 3.2 92.9 167.8 17.9 414.1
1954 86.7 4.0 0.0 37.6 0.9 67.1 151.6 17.9 365.8
1961 69.8 5.5 3.5 62.0 0.0 71.4 113.0 10.4 335.5
1991 64.2 6.9 1.1 48.2 0.6 82.8 113.4 6.9 324.3
1964 47.2 3.1 3.2 63.1 0.1 41.0 148.7 8.9 315.3
1981 66.3 0.7 19.1 36.1 1.5 86.1 86.3 3.8 299.9
1959 65.8 13.9 4.7 24.5 0.0 1.8 150.6 11.5 272.7
1946 23.4 5.7 1.5 38.0 0.0 86.1 117.1 0.1 271.9
1953 45.8 0.6 0.0 33.3 0.0 31.8 141.6 17.9 271.0
1992 74.6 0.2 0.0 29.8 0.0 48.8 84.8 13.8 252.0
1963 14.7 0.7 0.0 16.7 0.0 43.8 159.3 1.2 236.4
mean shortage 65.8 9.1 5.2 45.2 1.1 63.4 133.3 10.0 333.2

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