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Integrating tools to scope coordinated reservoir-floodplain management
for climate resilience Jeff Opperman and Andy Warner, The Nature Conservancy
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Annual flood damages in U.S. (1903 – 2011)
Source: NOAA
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Competition in multipurpose reservoirs
Flood control
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The value of connected floodplains
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Status quo operation – flood pool empty
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Status quo operation – flood pool in use during flood
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Status quo operation – vulnerable to drought
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Reallocation of flood pool to other uses
“new” water Reallocation of flood pool to other uses
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Reallocation – modeled increase in flood risk
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$ Reallocation – investments in flood-risk reduction
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$ Reallocation – investments in flood-risk reduction
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Model components Flood pool % current: 100, 75, 50, 25, 0
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
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Study Sites Mokelumne River Savannah River
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Savannah River Reservoir Reallocation and Floodplain Management
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Savannah River Reservoir Reallocation and Floodplain Management
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Savannah River Reservoir Reallocation and Floodplain Management
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Savannah River Reservoir Reallocation and Floodplain Management
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Savannah River Reservoir Reallocation and Floodplain Management
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Savannah River Reservoir Reallocation and Floodplain Management
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Mokelumne River Reservoir Reallocation and Floodplain Management
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Reoperation = reservoir can provide spring e-flows for salmon 4x more often
Reared in river habitat Reared in floodplain habitat
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Potential additional model components
Hydrology with climate change Flood pool % current: 100, 75, 50, 25, 0 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 Floodplain values Flood damages: HAZUS Potential additional model components
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