Computing Dependable Yield Mitigation Storage -DYMS-

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

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Reallocation from Conservation Pool
Reallocation from Flood Control
Flood Control
Flood Control
Flood Control
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
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Reallocation from Flood Control
Flood Control
Flood Control
Requested Storage DYMS

• Conservation Pool
• Hydropower
• Water Supply

• Conservation Pool
• Hydropower
• Water Supply

Existing
Modified
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US Army Corps of Engineers
Computing DYMS
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Summary
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 lt GUESS lt 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

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For further information contact
US Army Corps of Engineers

• Jonathan C. Long, P.E.
• [phone]
• CESWL-PR-P
• Jonathan.c.long_at_usace.army.mil

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