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Making Better Decisions in an Uncertain World
Reservoir Operations Modeling
Modeling Reservoirs
• Continuity Equation• Balance multiple objectives• Represent operational controls
Basic Processes
Evaporation
Spillway
Outlet
Seepage Sedimentation
Inflow
Reservoir
Reservoir Pools
Flood Control
Conservation
Dead Pool
SurchargeDam Freeboard
Dead Pool
• “Inactive” pool• Maintain head for hydroelectric power• Fish habitat• Sediment reserve
Conservation Pool
• Municipal & industrial supply• Irrigation• Navigation/recreation• Hydroelectric Power• Instream flow maintenance
Seasonal Conservation Pool
Surcharge
Inactive Pool
Flood Control Pool
Conservation Pool
Rese
rvoi
r Ele
vatio
n
Months (Jan – Dec)
Flood Control
• Remains empty• Weir or Orifice• Downstream control• Upstream control
Surcharge
• Weir flow over spillway• Uncontrolled storage capacity• Presents risk downstream• Never overtop dam under any condition
Flood Control vs. Conservation
• Continuous balancing act• Model impacts– Policy changes– New facilities– New supplies
Questions?
Jason Lillywhite, P.E.
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