What is OASIS?

1. What is OASIS? • Water resources simulation/optimization model • Uses goals and constraints • Purposes: • Alternatives evaluation • Real-time operations and drought management • Gaming • Used in • Water allocation/conflict resolution • Hydropower relicensing and operations • Municipal system planning and operations

2. Applications of OASIS

3. Advantages of OASIS • Quick to build a system and powerful to run • All continuity equations are automatically written • Linear programming solver • 1/10th the code of Riverware, 1/100th the run time • Easy to use interface • Flexible • Operations control language provides creative operating rules • Works dynamically with other models (e.g., water quality, groundwater, salinity)

4. Alternatives Evaluation A major purpose of OASIS is to compare alternatives. That is, to compare the performance of alternative sets of facilities, demands, and operating policies over the whole range of the hydrologic record.

5. Drought (Risk) Management • Evaluate tradeoffs between adding new supplies and imposing demand restrictions • Develop triggers for implementing remedial actions • Quantify the risk associated with the plan • Frequency • Magnitude • Duration

6. Model Input • Time series of unregulated inflows • Time series of net evaporation • Physical data (reservoir SAE, turbine characteristics, channel capacities, etc.) • Operating Policies, e.g. • Rule curves • Minimum releases/environmental flows • Drought and flood management policies • Energy requirements

7. Model Output • Tables and Graphs of • Elevation • Flow • Derived attributes, e.g.habitat availability, energy, revenue, water supply shortages, recreation days at every time step at every point in the system

8. Rivanna River Basin OASIS model

9. Output