Savannah River Basin                        Drought Workshop October 24-25, 2012US Army Corps of EngineersBUILDING STRONG®
The Savannah River Basin                                       2088 sq miles                                              ...
Savannah River Basin Value to the NationHydropower:                                   Recreation: 5,340 Jobs1,254,846 MWH ...
Hartwell                                      Russell                               Thurmond3rd most-visited Corps project...
Congressional Authorization                                      Congressional AuthorizationAuthorized Purpose        Hart...
Savannah River Reservoir System                                             Pool Schematic    293,000 AC-FTTop of Con, 660...
Drought Trigger Action Levels                              665                                                            ...
Collaborative Process National Environmental Policy Act (NEPA) Clean Water Act (CWA) Endangered Species Act (ESA)      ...
Long-term & Sustained Drought1997-2002 rainfall   2002-2007 rainfall   2007-2012 rainfall    Deficit              Deficit ...
Hartwell Rainfall74.2     94.5     20.3                         BUILDING STRONG®
Russell Rainfall55.1        75.5      20.3                             BUILDING STRONG®
Thurmond Rainfall54.1     74.9    20.8                        BUILDING STRONG®
Why Aren’t the Lake Levels Rising?   Anderson, S.C.               Anderson                     Hartwell                   ...
Why Aren’t the Lake Levels Rising?Ground soaks up                                   Produces Run offrainfall; no run off  ...
Drainage Basins Hartwell = 1186 Square Miles (Local Basin Area)   1” Runoff = 1.1’ pool elevation @ 660.0 Russell = 802 ...
Drought Plan History       Event                                 Action                                    Description1986...
2012 Drought PlanTrigger          Time of Year                                      Drought Response Level                ...
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Hartwell Pool Elevation                          BUILDING STRONG®
10 Week Projection                     BUILDING STRONG®
Russell Pool Elevation                         BUILDING STRONG®
Thurmond Pool Elevation                      BUILDING STRONG®
10 Week Projection                     BUILDING STRONG®
Savannah River Basin                       Comprehensive Study   Purpose: Assess the current needs in the basin during fl...
July 2012 Congressional RequestDesires pool levels to remain no greater than 7-8 feet down. Releases would have to be 3,10...
Savannah River Basin Comprehensive Study Alternatives    Level           NAA                   Alt 1                  Alt2...
Questions?             BUILDING STRONG®
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Savannah River Basin Drought_October 2012

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Col. Jeff M. Hall, commander of the U.S. Army Corps of Engineers Savannah District, presented these slides during a series of public workshops about drought in the Savannah River Basin, October 24-25, 2012. The Corps Savannah District operates three hyrdoelectric dams and lakes on the upper Savannah River--lakes Hartwell, Richard B. Russell, and J. Strom Thurmond.

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  • This is a general schematic if the projects showing relative storages of the different projects based on summer full pool.
  • Corps owns and manages the containerCorps sells water supply storage in the reservoirsStates own the water States do the Water Supply permitting, both in the river and in the reservoirs.States use 3600 cfs as the minimum for their permitting of point source discharges
  • Our calculated basin average rainfall is based on observed rainfall being used back to 1948, shortly before the projects were constructed.Based on the compounding deficit, we appear to be experiencing some climate change
  • There are lots of reasons why when you see it rain, we do not see the lake levels rise much. Only the rainfall that falls within the local basin of a project has the possibility of ever seeing some of that rainfall ever make it into that reservoir. Other factors affecting pool levels are upstream releases, soil conditions, time of year, and intensity of rainfall. It is not until the soil is near saturated before you will see significant amounts of runoff.
  • Run off will also vary depending on the development of the area. Urban areas are likely to result in more run off because of buildings, concrete, asphalt and other man-made surfaces that do not absorb water. Rural areas will have much less run off because water will be absorbed into the soil and consumed by trees and other vegetation.
  • When it rains, typically less than 40 percent of that rainfall becomes runoff.
  • Dates in red font represent changes in the 2012 DCP
  • Issues: Insufficient sponsor funding and resources to proceed. The sponsors are coordinating internally and with the other sponsors to determine how to move forward with non-Federal contributions towards the study.
  • Savannah River Basin Drought_October 2012

    1. 1. Savannah River Basin Drought Workshop October 24-25, 2012US Army Corps of EngineersBUILDING STRONG®
    2. 2. The Savannah River Basin 2088 sq miles 802 sq miles 2890 sq miles•Total Drainage Basin Area -10580 sq miles BUILDING STRONG®
    3. 3. Savannah River Basin Value to the NationHydropower: Recreation: 5,340 Jobs1,254,846 MWH $2.2M User Fees,$70.7M Treasury Receipts 16M Visits $464M Visitor Spending Water Supply: Environmental Stewardship: 29 Communities $1.7M Timber Receipts $53,000 Revenues $270K Shoreline Use RevenuesGPA Cumulative Flood Damage Prevented: $211MNavigation:$15.5B Income$61.7B Revenue BUILDING STRONG®
    4. 4. Hartwell Russell Thurmond3rd most-visited Corps project in the Largest Corps power plant east of 8th most-visited Corps project in the Nation - 10.1M visitors/year Mississippi River Nation-6M visitors/year Completed in 1962 Completed in 1984 Completed in 195256,000 acres (660 ft), 962-mile shoreline 26,653 acres (475 ft ), 540-mile shoreline 71,100 acres (330 ft ), 1200-mile shoreline 5 turbines , 422 MW 8 turbines, (4 as pump-back) 648 MW 7 turbines, 364 MW85 Recreation areas (50 Corps operated) 32 Recreation areas (3 Corps operated) 55 Recreation areas (35 Corps operated) Largest shoreline management program in the Corps BUILDING STRONG®
    5. 5. Congressional Authorization Congressional AuthorizationAuthorized Purpose Hartwell Russell Thurmond Flood Damage Flood Control Act of Reduction Flood Control Act of 1966 Flood Control Act of 1950 1944 Hydropower No Navigation Navigation Authorization Water Supply Act of 1958 Water Supply Federal Water Pollution Control Act of 1972 Water Quality Federal Water Project Federal Water Recreation Act of 1965, Fish and Wildlife Project Recreation WRDA 1986 WRDA 1986 Act of 1965 Federal Water Project Recreation Recreation Act of 1965 BUILDING STRONG®
    6. 6. Savannah River Reservoir System Pool Schematic 293,000 AC-FTTop of Con, 660 1,416,000 AC-FT 1,134,100 AC-FT 140,000 AC-FT 126,800 AC-FT 899,400 AC-FT 390,000 AC-FT Top of Con, 330 1,045,000 AC-FT System Storage Flood Control Storage 823,000 AC-FT 1,465,000 AC-FT Conservation Storage 2,587,800 AC-FT Inactive Storage 3,498,500 AC-FT BUILDING STRONG®
    7. 7. Drought Trigger Action Levels 665 335 660 Guide Curve 330 656 Drought Trigger Level 1 326 655 325 654 Drought Trigger Level 2 324 652 322 650 320 Thurmond Elevation (FT-MSL)Hartwell Elevation (FT-MSL) 646 Drought Trigger Level 3 316 645 315 Drought Trigger Level 4 (Thurmond) 312 640 310 635 305 630 300 625 Drought Trigger Level 4 (Hartwell) 295 620 290 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan BUILDING STRONG®
    8. 8. Collaborative Process National Environmental Policy Act (NEPA) Clean Water Act (CWA) Endangered Species Act (ESA) BUILDING STRONG®
    9. 9. Long-term & Sustained Drought1997-2002 rainfall 2002-2007 rainfall 2007-2012 rainfall Deficit Deficit Deficit Hartwell -29.93 Hartwell -19.63 Hartwell -32.94 Thurmond -21.63 Thurmond -4.42 Thurmond -12.41 BUILDING STRONG®
    10. 10. Hartwell Rainfall74.2 94.5 20.3 BUILDING STRONG®
    11. 11. Russell Rainfall55.1 75.5 20.3 BUILDING STRONG®
    12. 12. Thurmond Rainfall54.1 74.9 20.8 BUILDING STRONG®
    13. 13. Why Aren’t the Lake Levels Rising? Anderson, S.C. Anderson Hartwell BUILDING STRONG®
    14. 14. Why Aren’t the Lake Levels Rising?Ground soaks up Produces Run offrainfall; no run off BUILDING STRONG®
    15. 15. Drainage Basins Hartwell = 1186 Square Miles (Local Basin Area) 1” Runoff = 1.1’ pool elevation @ 660.0 Russell = 802 Square Miles (Local Basin Area) 1” Runoff = 1.5’ pool elevation @ 475.0 Thurmond = 3254 Square Miles (Local Basin Area) 1” Runoff = 2.5’ pool elevation @ 330.0 Typically it would have to rain between 2 and 6 inches in order to develop 1 inch of runoff depending on conditions BUILDING STRONG®
    16. 16. Drought Plan History Event Action Description1986-1989 Drought 1989 Drought Contingency Plan Introduced flow restrictions(New Drought of Record) Level 1 – Safety Advisory for boaters Level 2- Max weekly average 4500 cfs Level 3- Specified 3600 cfs daily average at Thurmond1998-2002 Drought 2006 Drought Plan Update Environmental Level 1 – Max weekly average 4200 cfs(New Drought of Record) Assessment - (Step 1 Savannah River Basin Level 2- Max weekly average 4000 cfs Comprehensive Study) Level 3- Specified 3800 cfs daily average at Thurmond2007-2009 Drought Temporary deviation to 3600cfs at Thurmond Reduction occurred at Drought Level 2(New Drought of Record) Oct2007-May2009 (supported by Federal and State (Hartwell @ 649.85/ agencies without an EA) Thurmond@319.76) Temporary Deviation to 3100cfs Dec2008-Jan2009 Used adaptive management to (supported by Federal and State agencies without maintain 3600 min @ Savannah River an EA) at Augusta gage Drought Level 4 Study and Environmental Developed standard operating Assessment procedure for inactive storage (Level 4)2011-? Drought 2012 Drought Plan Revision Environmental Evaluation and modification of the 2006 Assessment EA rules in the 2007-2009 drought and temporary deviations Will refill lake above winter drawdown to full pool Seeking resource agency concurrence to hold 3,800 cfs during refill BUILDING STRONG®
    17. 17. 2012 Drought PlanTrigger Time of Year Drought Response Level IF BR index >10%, Target 4200 cfs (daily average) release at Thurmond Dam 1 Jan 1 - Dec 31 IF BR index <10%, Target 4000 cfs (daily average) release at Thurmond Dam IF BR index >10%, Target 4000 cfs (daily average) release at Thurmond Dam Feb 1 - Oct 31 2 IF BR index <10%, Target 3800 cfs (daily average) release at Thurmond Dam Nov 1 - Jan 31 Target 3600 cfs (daily average) release at Thurmond Dam Feb 1 - Oct 31 Target 3800 cfs (daily average) release at Thurmond Dam 3 Nov 1 - Jan 31 (Feb 1 – Feb 28 Target 3100 cfs (daily average) release at Thurmond Dam w/NMFS approval) Feb 1 - Oct 31 Target 3600 cfs (daily average) release at Thurmond Dam 4 Nov 1 - Jan 31 (Feb 1 – Feb 28 Target 3100 cfs (daily average) release at Thurmond Dam w/NMFS approval) BUILDING STRONG®
    18. 18. BUILDING STRONG®
    19. 19. BUILDING STRONG®
    20. 20. Hartwell Pool Elevation BUILDING STRONG®
    21. 21. 10 Week Projection BUILDING STRONG®
    22. 22. Russell Pool Elevation BUILDING STRONG®
    23. 23. Thurmond Pool Elevation BUILDING STRONG®
    24. 24. 10 Week Projection BUILDING STRONG®
    25. 25. Savannah River Basin Comprehensive Study Purpose: Assess the current needs in the basin during flood, normal and drought conditions to determine whether operational changes are warranted. Study Components: ► Interim Study I: Completed in 2006 with an Environmental Assessment and operational changes to the Comprehensive Study. ► Interim Study II: Drought Contingency Plan Update and determine the minimum acceptable flow during droughts. ► Future Interim Studies: Hydrologic Engineering and Environmental Analyses. Study Sponsorship: ► Study Cost: Interim Study I: $1.8M, Interim Study II: $908K, Interim Study III: TBD ► Cost Share: 50% Federal/ 50% Non-Federal (cash or work-in-kind services) ► Non-Federal Sponsors: GA-DNR, SC-DNR (and The Nature Conservancy) Estimated Completion Date: 2027 (Interim Study II: 2014) BUILDING STRONG®
    26. 26. July 2012 Congressional RequestDesires pool levels to remain no greater than 7-8 feet down. Releases would have to be 3,100 cfs when 2’below full pool to meet this requirement during the current drought period. A 3,100cfs constant release isunacceptable to State and Federal resource agencies. (3,600cfs is the current minimum permittingstandard) 3,100 cfs 3,800 cfs Drought Plan BUILDING STRONG®
    27. 27. Savannah River Basin Comprehensive Study Alternatives Level NAA Alt 1 Alt2 Alt 3 Alt4 Alt 5 Drought 1 4200 >10% Qin 3800 Feb-Apr 4000 at 326 3600 Ecosystem TO BE DETERMINED 4000 <=10% Qin 3500 May-Jan Flow Prescription 3100 Nov-Jan Drought 2 4000 >10% Qin 2800 Feb-Apr 3800 at 324 3600 Ecosystem 3800 <=10% Qin 3600 Nov-Jan 2500 May-Jan 3600 Nov-Jan Flow Prescription 3100 Nov-Jan Drought 3 3800 1800 Feb-Apr 3600 at 322 3600 Ecosystem 1500 May-Jan 3100 Nov-Jan 3100 Nov-Jan Flow Prescription 3100 Nov-Jan 4 1800Feb-Apr 3600 1500 May-Jan 3600 3600 3600 3100 Nov-Jan 3100 Nov-Jan 3100 Nov-Jan 3100 Nov-Jan 10% Qin is defined as the 10th percentile flow at the Broad River near Bell piedmont reference stream gage for reservoir inflow. Holding minimum drought release until pools have recovered to guide curve will be evaluated on chosen Alternative. BUILDING STRONG®
    28. 28. Questions? BUILDING STRONG®

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