Missouri River Basin Water Management

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1 Missouri River Basin Water Management Spring 2011 Public Meetings April 12 th 11:00 a.m. Nebraska City, NE April 12 th 7:00 p.m. Fort Peck, MT April 13 th 1:00 p.m. Bismarck, ND April 13 th 7:00 p.m. Pierre, SD April 14 th 1:00 p.m. Jefferson City, MO April 14 th 7:00 p.m. Kansas City, MO US Army Corps of Engineers BUILDING STRONG

2 Missouri River Mainstem Reservoir System Fort Peck Dam and Reservoir Garrison Dam and Reservoir Fort Peck Garrison North Dakota Montana Oahe Dam and Reservoir South Dakota Oahe Big Bend Big Bend Dam and Reservoir Wyoming Fort Randall Gavins Point Iowa Fort Randall Dam and Reservoir Colorado Nebraska Gavins Point Dam and Reservoir Kansas Missouri 2

3 Our Mission Regulate Missouri River Mainstem Reservoirs to Support Congressionally Authorized Purposes Water Supply Water Quality Flood Control Hydropower Control Recreation Navigation Fish and Wildlife Including Threatened and Endangered Species Irrigation 3

4 4

5 Missouri River Mainstem System Storage Zones and Allocations Exclusive Flood Control 6% Annual Flood Control & Multiple Use 16% April 6, Storage In MAF Carryover Multiple Use 53% 33.9 Permanent Pool 25%

6 Current Reservoir Levels April 6, 2011 Fort tpeck Garrison Exclusive Flood Control Annual Flood Control & Multiple Use Exclusive Flood Control Annual Flood Control & Multiple Use Carryover Multiple Use Carryover Multiple Use Permanent Pool 2160 Permanent 1775 Pool feet above top of Carryover 4.0 feet above top of Carryover Oahe Exclusive Flood Control Annual Flood Control & Multiple Use System Storage Exclusive Flood Control 1617 Annual Flood Control & Multiple Use Carryover Multiple Use Carryover Multiple Use 33.9 Permanent Pool 1540 Permanent 17.9 Pool feet above top of Carryover 5.8 MAF above top of Carryover 6

7 Flood Control Storage (Exclusive) Fort Peck (Annual) (Exclusive) Garrison (Exclusive) Oahe The shapes are to scale and represent the relative size of the total flood control storage (annual + exclusive) at the six mainstem projects. (Annual) (Annual) Project Total Flood Control lstorage % of Total Flood (ac-ft) Storage Fort Peck 3,675, Big Bend (Exclusive) Fort Randall (Annual) Garrison 5,711, Oahe 4,303, Gavins Big Bend 177, Point Fort Randall 2,294, Gavins Point 108,

8 Runoff Components Plains Snowpack Mountain Snowpack Rainfall March and April May, June and July March through October *April 1 Forecast 2011 Forecast* = 33.8 MAF 8

9 Plains Snowpack 25 February February 2010

10 Missouri River Basin Mountain Snowpack Water Content

11 11

12 Annual Runoff above Sioux City, IA 2011 (Apr 1 Forecast) = 33.8 MAF (136% of normal) 2010 = 387MAF = 33.5 MAF 2008 = 26.8 MAF Average = 24.8 MAF 12

13 50 Million Acre-Feet Missouri River Mainstem System Annual Runoff above Sioux City, IA 2011 Historic Drought Periods Forecast MAF 10% U.D % U.Q % Med % 90% L.Q. L.D

14 Missouri River Runoff above Sioux City 2010 Actual and 2011 Actual/Forecasted 9 Million Acre-Feet Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Normal 2010 Actual 2011 Actual/Forecasted 14

15 Missouri River Basin 2011 Runoff Forecast Fort Peck: 8.5 maf (118%) Garrison: 12.3 maf (116%) Oahe: 4.3 maf (179%) Fort Randall : 1.7 maf (187%) Gavins Point: 2.0 maf (120%) Sioux City: 5.0 maf (248%) Nebraska City St. Louis 15

16 Service Level Increase Purpose Evacuation of System flood storage Longer evacuation period Master Manual Criteria Observed System storage Remaining forecasted runoff above Gavins Point Available Storage in Reclamation reservoirs Service Level Adjustments 16

17 Expected Results for Authorized Purposes in

18 75 Million Acre-Feet System Storage April 1 Forecast Top of Exclusive Flood Control 73.1 maf 70 Base of Exclusive Flood Control 68.4 maf Base of Annual Flood Control 56.8 maf 50 System Storage Check J F M A M J J A S O N D J F M A M J J A S O N D J F

19 2250 Elevation in feet msl Fort Peck April 1 Forecast Top of Exclusive Flood Control 2250 feet msl Base of Exclusive Flood Control 2246 feet msl 2240 Base of Annual Flood Control 2234 feet msl J F M A M J J A S O N D J F M A M J J A S O N D J F

20 1855 Elevation in feet msl Garrison April 1 Forecast Top of Exclusive Flood Control 1854 feet msl 1850 Base of Exclusive Flood Control 1850 feet msl Base of Annual Flood Control feet msl J F M A M J J A S O N D J F M A M J J A S O N D J F

21 1620 Elevation in feet msl Oahe April 1 Forecast Top of Exclusive Flood Control 1620 feet msl Base of Exclusive Flood Control 1617 feet msl Base of Annual Flood Control feet msl J F M A M J J A S O N D J F M A M J J A S O N D J F

22 Flood Control All flood storage space available at start of runoff season Significant plains snowpack Below Gavins Point High tributary runoff No March spring pulse Above Gavins Point High tributary tar runoff Utilizing portion of annual flood control zones Service Level Increased 22

23 Hydropower 16 Billion kwh Gavins Point Ft. Randall Big Bend Oahe Garrison Fort Peck Forecast BUILDING STRONG 23

24 Navigation Above full service flows Current targets Full service + service level adjustment Sioux City (41,000 cfs) Omaha (41,000 cfs) Nebraska City (47,000 cfs) Kansas City (51,000 cfs) 10-day season length extension likely 24

25 Water Supply Water Quality Irrigation Recreation Normal to above normal elevations and releases No access issues expected 25

26 Fish and Wildlife Steady to rising levels at upper three reservoirs during forage fish spawn Favor Garrison April 20 to May 20 if runoff not sufficient Minimize zero releases at Fort Randall 26

27 Endangered Species Act of 1973 Each Federal Agency shall... ensure that any action authorized, funded, or carried out by such agency is not likely to jeopardize the continued existence of any endangered or threatened species or result in the destruction or adverse modification of habitat Interior Least Tern Listed Endangered 1986 Piping Plover Listed Threatened 1986 Pallid Sturgeon Listed Endangered

28 Threatened and Endangered Species Gavins Point Piping Plover and Least Tern Steady release flow to target Cycle Gavins Point releases Intra-day peaking patterns Garrison & Fort Randall Measures to minimize take 28

29 Threatened and Endangered Species Bi-Modal Spring Pulse Pallid Sturgeon 2003 Amended d Biological i l Opinion i Reasonable and Prudent Alternative March not implemented in 2011 May will not be implemented due to higher service level Monitoring in place Biological, interior drainage, groundwater 29

30 Spring Pulse Downstream Flow Limits Gavins Point Dam Sioux City (1.5 days) Service Level Target = 41,000 cfs Omaha (3 days) Service Level Target = 41,000 cfs Downstream Flow Limit = 41,000 cfs Nebraska City (3.5 days) Service Level Target = 47,000 cfs Downstream Flow Limit = 47,000 cfs Kansas City (6.0 days) Service Level Target = 51,000 cfs Downstream Flow Limit = 71,000 cfs St. Louis Boonville Hermann 30

31 Gavins Point Releases 40 Release in 1000 cfs Typical Bi-modal Spring Pulse 35 Typical Gavins Cycling Typical Gavins Steady Release Average long-term release needed to meet all full service navigation targets AOP Forecast Full Service Navigation 2011 Actual 1 April Forecast 15 1-Mar 29-Mar 26-Apr 24-May 21-Jun 31

32 Summary Above normal runoff Flood evacuation April to December Meet all authorized purposes 32 BUILDING STRONG

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