1. CADSWES Engineering Enhancements New Methods and Improved Functionality Steve Setzer

2. Slide 2 Engineering Enhancements  Water User  Reservoirs  Reach  Control Point  Forecast Hydrology Methods

3. Slide 3 Water User Methods  Input Diversion/Depletion Requests  When Diversion Request input, Depletion Request calculated as Diversion Request * Efficiency  When Depletion Request input, Diversion Request calculated as Depletion Request / Efficiency

4. Slide 4 Water User Methods (cont.)  Pump Back Return Flows  Only available if Impulse Response Routing is selected in Return Flow Routing category  Return Flow calculated as function of Diversion, Consumptive Use Requirement, Irrigated Area and Incidental Depletions  If there are pump back flows, this water is added to Return Flow (after a depletion is applied) and removed from Routed Return Flow

5. Slide 5 Reservoir Enhancements  New convergence algorithms  Change to Min Power Elevation  Prior to 4.3, Turbine Release is zero when average pool elevation is below Min Power Elevation – causes a “jump” in outflow curve  In 4.3, the previous pool elevation is used  If previous pool elevation < Min Power Elevation, Turbine Release is zero regardless of current Pool Elevation (and vise versa)  Need method/data for describing the transition period between the Min Power Elevation and the elevation at which the turbine Q tables become applicable

6. Slide 6 Reservoir Enhancements (cont.)  Storage convergence going negative  Iterative routine to solve storage may need to go negative at very low storage values  User can add negative storage row to Elevation Volume table  In 4.3, RiverWare detects the problem and resets a negative storage to 0.0 to continue iterating

7. Slide 7 Reach Methods  Downstream Only Time Lag Dispatching  In Local Inflow Solution Direction category, method called Local Inflow Downstream Only  Solves dispatching problems in rules models with complicated priorities  Also decreases the amount of re-solving  Impulse Response Routing for Seepage  Calculated seepage stored in Pre-Routed Seepage slot  Routed values are computed and stored in the Seepage slot  Also exists on Distribution Canal Object

8. Slide 8 New Control Point Object  Used for U.S. Corps of Engineers flood control methods (under development)

9. Slide 9 Forecast Hydrology Methods  Exist on Reservoir, Reach, and Control Point objects  Used to compute an inflow forecast based on a period of perfect knowledge and a recession equation  User specifies the known inflows (Deterministic Local Inflow slot), period of perfect knowledge, forecast period, and recession data  Method executes at the beginning of each timestep and solves all forecasted Local Inflows

10. Slide 10 Forecast Hydrology Methods  Geometric Recession  Within period of perfect knowledge, Local Inflow = Deterministic Local Inflow  For remainder of forecast period, Local Inflow = previous Local Inflow * recession factor  Exponential Recession  Within period of perfect knowledge, Local Inflow = Deterministic Local Inflow  For remainder of forecast period, the Local Inflow is recessed based on the first-order, exponential decay equation

11. Slide 11 Forecast Hydrology Methods  Coefficient and Exponent Method  Assumes a one timestep period of perfect knowledge  Remaining timesteps in the forecast period are computed by:

12. Slide 12 Additional Information  Online help documents  Describes the use of all engineering methods and rule functions  Release notes  Describes new functionality added since last release