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


Tables

Table 17. Instream flow shortages (thousands acre-feet (kaf)) at Grand Island sorted from highest to lowest and based upon the comparison of each monthly volume with monthly weighted USFWS instream flow recommendations (IFR) (M. Butler, USFWS, personal communication). The wet and normal years are included together because the target flows during February/March and May/June are desired 75 percent of the time and therfore includes all years except dry years. For May and June, the shortage is relative to a 3,000 cfs flow with a 30-day duration. Because the pulse flow recommendation includes a mean annual peak flow of 8,300 cfs to 10,800 cfs, the May/June shortage is based upon the mean annual pulse flow target and monthly volume.

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Mean CFS
Wet IFR, cfs 2400 1700 1000 1000 2575 2724 2400 2284 2400 1200 1200 1100 1825
Avg IFR, cfs 1800 1400 1000 1000 2575 2724 2400 2284 2400 1200 1200 1100 1749
Wet IFR, kaf 147.0 101.2 61.5 61.5 143.0 167.5 142.8 140.4 142.8 73.8 65.5 147.8 1321.3
Avg IFR, kaf 110.7 83.3 61.5 61.5 143.0 167.5 142.8 140.8 142.8 73.8 65.5 147.6 1266.5
Average Years
Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Mean CFS
1978 55.8 29.0 2.2 14.6 86.4 0.0 35.7 83.9 123.4 67.3 63.7 51.9 613.9
1976 66.4 24.3 0.0 0.0 37.0 60.8 44.1 74.1 123.3 64.5 72.5 47.0 613.9
1982 61.6 21.4 0.0 0.0 39.6 50.0 83.9 78.0 102.7 52.3 49.6 28.6 587.6
1968 38.1 3.0 0.0 0.0 53.6 75.5 72.7 88.9 104.1 57.4 47.6 22.8 563.7
1943 87.1 48.7 0.0 0.0 19.0 83.4 29.0 54.3 63.5 35.8 72.8 64.9 558.4
1944 99.9 34.6 12.5 0.0 60.0 53.6 5.2 0.0 102.7 61.1 70.8 54.8 555.2
1967 56.0 21.4 6.2 0.0 67.0 98.3 110.4 110.9 0.0 0.0 48.1 29.2 547.5
1990 55.0 28.7 16.9 0.0 50.4 43.1 30.6 34.5 102.0 64.9 38.4 49.1 513.6
1977 65.0 36.9 0.9 5.8 71.1 74.9 5.4 28.7 85.1 63.1 57.3 18.3 512.5
1989 48.5 29.3 0.0 0.0 49.0 43.7 98.2 115.3 85.1 0.0 39.0 0.0 508.2
1945 69.7 24.2 0.0 0.0 38.0 81.3 77.5 81.1 0.0 43.9 59.2 27.3 502.1
1948 60.4 18.2 0.0 0.0 32.0 0.0 42.1 92.6 106.3 54.7 33.1 55.4 494.6
1975 55.1 34.5 2.7 0.0 69.9 64.7 51.5 81.3 34.3 35.6 51.7 12.0 493.1
1965 69.9 40.5 14.7 6.9 83.2 74.5 74.2 64.1 0.0 0.0 68.2 0.0 486.2
1966 0.0 0.0 0.0 0.0 26.9 16.1 17.4 102.6 117.4 68.4 62.3 53.2 464.3
1979 74.3 35.5 1.7 10.6 93.3 2.1 40.1 66.1 20.5 0.0 48.6 45.2 437.9
1960 52.7 15.2 0.6 4.5 48.6 0.0 14.2 54.4 61.1 46.3 73.7 65.5 436.7
1950 42.9 0.0 0.0 0.0 34.1 55.5 36.3 37.4 98.4 39.6 55.0 28.8 428.0
1969 37.0 4.4 9.0 0.0 52.4 0.0 54.5 69.8 68.0 0.0 57.0 1.6 353.8
1958 56.5 18.5 0.0 0.0 647.0 37.5 0.0 1.4 28.5 9.8 59.1 60.9 339.1
1947 0.0 0.0 0.0 0.0 65.0 46.2 35.6 84.7 0.0 0.0 52.8 34.5 318.9
1962 48.9 0.0 0.0 0.0 24.2 0.0 64.4 89.9 5.7 0.0 43.0 38.7 314.8
1990 85.3 40.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 50.4 53.8 36.8 266.8
1972 17.6 0.0 0.0 0.0 0.0 0.0 26.2 0.0 104.9 56.7 24.4 32.5 262.2
1974 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.5 82.6 70.7 62.6 39.5 255.9
1949 76.3 11.8 0.0 13.4 52.5 0.0 0.0 0.0 0.0 0.0 58.0 23.8 235.7
1952 11.8 0.0 0.0 0.0 0.0 0.0 0.0 7.1 68.1 27.2 62.9 55.8 233.0
1988 7.0 0.0 0.0 0.0 0.0 14.0 28.1 12.8 112.2 5.4 25.8 14.8 220.1
1951 34.9 5.7 0.0 0.0 34.9 46.9 34.7 18..5 0.0 0.0 34.0 0.0 209.6
1970 17.4 0.0 0.0 0.0 1.0 25.1 0.0 27.2 15.9 0.0 65.0 20.9 172.4
1971 19.7 0.0 0.0 0.0 24.1 3.7 9.7 0.0 0.0 0.0 59.0 34.9 151.1
1985 0.0 0.0 0.0 0.0 0.0 0.0 4.9 0.0 61.4 30.5 23.7 0.0 120.5
1983 48.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 48.7
1984 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 435 0.0 43.5
1987 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 29.2 0.0 29.2
1973 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 6.2 0.0 6.2
1986 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Mean shortage
kaf
41.1
14.2
1.8
1.5
34.6
28.4
30.5
42.2
50.7
27.2
47.6
28.3
348.1
Dry Years
Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Mean CFS
Dry IFR,
cfs 		1300 950 600 600 1725 1863 1700 1090 800 800 800 700 1072
Dry IFR,
kaf 		79.9 56.5 36.9 36.9 95.8 114.0 101.2 67.0 49.6 49.2 49.2 41.7 775.8
Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Mean CFS
1956 74.3 26.8 0.2 0.0 40.3 49.5 57.3 56.6 46.4 49.1 49.2 41.7 491.4
1957 79.9 48.3 20.5 24.6 56.5 66.6 44.1 0.0 0.0 30.3 48.8 19.7 439.4
1963 14.5 0.0 0.0 0.0 0.0 0.0 21.8 410.1 21.7 48.7 49.2 8.7 409.3
1955 63.6 10.3 0.0 0.0 35.1 13.8 51.0 57.9 14.7 47.1 49.2 41.7 384.4
1954 72.7 0.0 0.0 0.0 0.0 34.5 49.0 9.9 31.6 49.2 43.6 41.2 331.6
1964 33.6 5.9 0.0 0.0 37.2 36.4 18.8 32.6 27.4 40.7 39.8 28.8 301.3
1961 51.6 10.3 0.0 0.0 26.3 38.9 44.1 0.0 0.0 43.8 40.7 33.9 289.6
1991 49.9 8.4 0.0 0.0 10.3 38.8 59.0 0.0 0.0 41.1 38.9 26.6 272.9
1981 43.7 16.8 0.0 0.0 30.7 31.2 52.5 21.9 31.0 12.1 0.0 15.8 255.8
1959 49.9 0.0 0.0 0.0 22.6 0.0 0.0 0.0 38.2 36.2 48.7 35.3 230.9
1953 39.2 0.0 0.0 0.0 0.0 0.0 17.1 0.0 15.9 49.2 49.2 41.7 212.2
1946 15.6 0.0 0.0 0.0 7.9 7.8 59.4 20.1 7.8 40.2 47.2 10.0 206.0
1992 59.7 4.9 0.0 0.0 9.6 0.0 25.7 43.8 13.2 1.2 20.9 19.9 198.9
Mean
Shortage kaf
49.9
10.1
1.6
1.9
21.3
24.4
38.5
21.8
19.1
37.6
40.4
27.3
293.8

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