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TR-60 Hydrologic Design Criteria

TR-60 Hydrologic Design Criteria. NRCS Dam Class. TR-60 Min PS Hydrology. NA for structural spillways. TR-60 Min AS Hydrology. Stability Integrity. TR-60 Auxiliary Spillway Criteria. SDH : 6-hr duration ( Stability ) Determine spillway surface erosion

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TR-60 Hydrologic Design Criteria

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  1. TR-60 Hydrologic Design Criteria

  2. NRCS Dam Class

  3. TR-60 Min PS Hydrology NA for structural spillways

  4. TR-60 Min AS Hydrology Stability Integrity

  5. TR-60 Auxiliary Spillway Criteria SDH: 6-hr duration (Stability) Determine spillway surface erosion Compare actual (SITES) to allowable stress (AH 667) FBH: 6-hr and 24-hr (Integrity) Use most critical duration Sets minimum dam crest Determine spillway integrity (breach)

  6. PSH DRAWDOWN 10 days

  7. PSH 10-Day Drawdown AS Crest 10-d DD Start elev SDH/FBH Start elev PSH

  8. Drawdown – 15% Test 10-d DD < 15% storage volume between PS crest and AS crest Set PS crest as SDH/FBH start elev If drawdown > 15% storage vol Set drawdown elev as SDH/FBH start elev

  9. Start Elev for SDH/FBH Highest of these elevations: 10-day drawdown from PSH (QRF is a factor) PS crest Total sediment

  10. Baseflow & QRF PDIRECT QDIRECT PSH RO RO from RF QRF QRF BF BF BF SDH&FBH RO RO from RF BF BF BF

  11. End

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