Computing Dependable Yield Mitigation Storage -DYMS-

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Computing Dependable Yield Mitigation Storage -DYMS- US Army Corps of Engineers ® Computing Dependable Yield Mitigation Storage -DYMS- One Corps Serving The Army and the Nation

Why Compute DYMS? US Army Corps of Engineers ® DYMS: Are determined to keep other water supply users yield whole Require requesting entity to purchase the extra storage to keep other users yield whole Must be calculated when storage is reallocated from the flood pool Do not have to be calculated when reallocations are made from the conservation pool One Corps Serving The Army and the Nation

Reallocation from Conservation Pool Reallocation from Flood Control Requested Storage + DYMS Conservation Pool Hydropower Water Supply Conservation Pool Hydropower Water Supply Requested Storage Conservation Pool Hydropower Water Supply Conservation Pool Hydropower Water Supply Existing Existing Modified Modified

Reallocation from Flood Control Requested Storage + DYMS Conservation Pool Hydropower Water Supply Conservation Pool Hydropower Water Supply Existing Modified

Computing DYMS One Corps Serving The Army and the Nation US Army Corps of Engineers ® Computing DYMS One Corps Serving The Army and the Nation

Summary 1. Iterative Process US Army Corps of Engineers ® 1. Iterative Process 2. Obtain Yield/Storage Curve and Curve Data 3. Guess at a new Total Yield (Current Reallocation < GUESS < Upper limit) 4. Interpolate to obtain New Storage 5. Determine new Yield/Storage Ratio 6. Use new Yield/Storage Ratio to obtain new storage values 7. Subtract the sum of the yield values from your “GUESSED Yield” to obtain Hydropower Yield 8. Check calculated hydropower storage against current hydropower storage 9. Re-iterate until the difference approaches zero One Corps Serving The Army and the Nation

For further information contact: US Army Corps of Engineers ® For further information contact: Jonathan C. Long, P.E. (501) 324-7342 CESWL-PR-P Jonathan.c.long@usace.army.mil One Corps Serving The Army and the Nation

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