1. Making Better Decisions in an Uncertain World Reservoir Operations Modeling

2. Modeling Reservoirs Continuity Equation Balance multiple objectives Represent operational controls

3. Basic Processes Evaporation Spillway Outlet Seepage Sedimentation Inflow Reservoir

4. Reservoir Pools Flood Control Conservation Dead Pool Surcharge Dam Freeboard

5. Dead Pool “Inactive” pool Maintain head for hydroelectric power Fish habitat Sediment reserve

6. Conservation Pool Municipal & industrial supply Irrigation Navigation/recreation Hydroelectric Power Instream flow maintenance

7. Seasonal Conservation Pool Surcharge Inactive Pool Flood Control Pool Conservation Pool Reservoir Elevation Months (Jan – Dec)

8. Flood Control Remains empty Weir or Orifice Downstream control Upstream control

9. Surcharge Weir flow over spillway Uncontrolled storage capacity Presents risk downstream Never overtop dam under any condition

10. Flood Control vs. Conservation Continuous balancing act Model impacts – Policy changes – New facilities – New supplies

11. Questions? Jason Lillywhite, P.E. For a free trial version of the software, visit: www.goldsim.com