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


Tables

Table 12. Annual and seasonal volumes for the wet, average, and dry hydrographs of the U.S. Fish and Wildlife Service instream flow recommendations (M. Butler, USFWS, personal communication). These annual volumes do not explicitly include recommendations for those flows which occur on a less frequent basis (e.g., 5-year peak flow of 16,000 acre-feet).

WET INSTREAM FLOW RECOMMENDATION HYDROGRAPH

Month

Begin

End

CFS

# Days
Acre- feet		 Total Acre- Feet Mean CFS
January 1 31 1,000 31 61,500 61,500 1,000
January 1,000
February 1 14 1,800 14 50,000
February 15 28 3,350 14 93,000 143,000 2,575
March 1 15 3,350 15 99,700
March 16 22 1,800 7 25,000
March 23 31 2,400 9 42,800 167,500 2,724
April 1 30 2,400 30 142,800
April 142,800 2,400
May 1 10 2,400 10 47,600
May 11 19 1,200 9 21,400
May 20 31 3,000 12 71,400 140,400 2,284
June 1 20 3,000 20 119,000
June 21 30 1,200 10 23,800 142,800 2,400
July 1 31 1,200 31 73,800
July 73,800 1,200
August 1 31 1,200 31 73,800
August 73,800 1,200
September 1 15 1,200 15 35,700
September 16 30 1,000 15 29,800 65,500 1,100
October 1 31 2,400 31 147,600
October 147,800 2,400
November 1 15 2,400 15 71,400
November 16 30 1,000 15 29,800 101,200 1,700
December 1 31 1,000 31 61,500
December 61,500 1,000
Total Acre-Feet 1,321,300
AVERAGE INSTREAM FLOW RECOMMENDATION HYDROGRAPH

Month

Begin

End

CFS

# Days
Acre- feet		 Total Acre- Feet
Mean CFS
January 1 31 1,000 31 61,500
January 61,500 1,000
February 1 14 1,800 14 50,000
February 15 28 3,350 14 93,000 143,000 2,575
March 1 15 3,350 15 99,700
March 16 22 1,800 7 25,000
March 23 31 2,400 9 42,800 167,500 2,724
April 1 30 2,400 30 142,800
April 142,800 2,400
May 1 10 2,400 10 47,600
May 11 19 1,200 9 21,400
May 20 31 3,000 12 71,400 140,400 2,284
June 1 20 3,000 20 119,000
June 21 30 1,200 10 23,800 142,800 2,400
July 1 31 1,200 31 73,800
July 73,800 1,200
August 1 31 1,200 31 73,800
August 73,800 1,200
September 1 15 1,200 15 35,700
September 16 30 1,000 15 29,800 65,500 1,100
October 1 31 1,800 31 110,700
October 110,700 1,800
November 1 15 1,800 15 53,600
November 16 30 1,000 15 29,800 83,300 1,400
December 1 31 1,000 31 61,500
December 61,500 1,000
Total Acre-Feet 1,266,500
DRY INSTREAM FLOW RECOMMENDATION HYDROGRAPH

Month

Begin

End

CFS

# Days
Acre- feet		 Total Acre- Feet Mean CFS
January 1 31 600 31 36,900
January 36,900 600
February 1 14 1,200 14 33,300
February 15 28 2,250 14 62,500 95,800 1,725
March 1 15 2,250 15 66,900
March 16 22 1,200 7 16,700
March 23 31 1,700 9 30,300 114,000 1,853
April 1 30 1,700 30 101,200

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