1. Integrating tools to scope coordinated reservoir-floodplain management for climate resilience Jeff Opperman and Andy Warner, The Nature Conservancy

2. Annual flood damages in U.S. (1903 – 2011) Source: NOAA

3. Competition in multipurpose reservoirs Flood control

4. The value of connected floodplains

5. Status quo operation – flood pool empty

6. Status quo operation – flood pool in use during flood

7. Status quo operation – vulnerable to drought

8. “new” water Reallocation of flood pool to other uses

9. Reallocation – modeled increase in flood risk

10. $ Reallocation – investments in flood-risk reduction

11. $

12. Bulletin 17B flood frequency analysis using HEC-SSP; period of record hydrology Inflows Reservoir operations with HEC-ResSim (scenarios of reducing flood storage) Hydropower revenue Water supply Recreation Ability to provide environmental flows Flood hydrology Inundation patterns: HEC-GeoRas Flood damages: HAZUS Model components Flood pool % current: 100, 75, 50, 25, 0

13. Study Sites Mokelumne River Savannah River

14. Savannah River Reservoir Reallocation and Floodplain Management

15. Savannah River Reservoir Reallocation and Floodplain Management

16. Savannah River Reservoir Reallocation and Floodplain Management

17. Savannah River Reservoir Reallocation and Floodplain Management

18. Savannah River Reservoir Reallocation and Floodplain Management

19. Savannah River Reservoir Reallocation and Floodplain Management

20. Mokelumne River Reservoir Reallocation and Floodplain Management

21. Reoperation = reservoir can provide spring e-flows for salmon 4x more often Reared in river habitat Reared in floodplain habitat

22. Bulletin 17B flood frequency analysis using HEC-SSP; period of record hydrology Inflows Reservoir operations with HEC-ResSim (scenarios of reducing flood storage) Hydropower revenue Water supply Recreation Ability to provide environmental flows Flood hydrology Inundation patterns: HEC-GeoRas Flood damages: HAZUS Potential additional model components Flood pool % current: 100, 75, 50, 25, 0 Hydrology with climate change Floodplain values