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

Applications of OASIS

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)

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.

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

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

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

Rivanna River Basin OASIS model

Output