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El Charro Specific Plan Hydrology & Hydraulics

El Charro Specific Plan Hydrology & Hydraulics. Daniel J. Schaaf, PE Mary Eliza McNulty, PE. Hydrology Existing and Future Flows Project Impacts Interesting Observations Hydraulics Proposed Features Floodplain Changes Sediment and Scour. Diverse Channel. 12,000 cfs. 1,500 cfs.

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El Charro Specific Plan Hydrology & Hydraulics

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  1. El Charro Specific PlanHydrology & Hydraulics Daniel J. Schaaf, PEMary Eliza McNulty, PE

  2. Hydrology • Existing and Future Flows • Project Impacts • Interesting Observations • Hydraulics • Proposed Features • Floodplain Changes • Sediment and Scour

  3. Diverse Channel 12,000 cfs 1,500 cfs

  4. 100yr Zone 7 Hydrology Q100ex = 22,074cfs Q100ult = 24,895cfs At Bernal

  5. Impacts to 100yr Hydrology At Bernal Q100ex = 22,074cfs Qnorth fill = 22,153cfs Qdesign = 21,983cfs

  6. HMP Impacts 100yr At El Charro Rd

  7. HMP Impacts 2yr At Bernal

  8. Channel Characteristics Crosswinds

  9. Channel Characteristics Proposed Bridge Site

  10. Channel Characteristics Golf Course

  11. Channel Characteristics Airway Blvd

  12. Impacts of Sediment Removalto 100-Year Peak Flow • Removing Sediment can decrease downstream peaks • HMP can increase downstream peak TIMING!

  13. Bridge Scour • HEC-18 Offers Limited Equations • Contraction, Abutment, Pier, etc. • Does not account for flow Re-Entering the Channel • Which Ultimate Condition do you Plan for?

  14. Scour Protection Alternatives • Locate Bridge in ‘stable’ site • Commit to Establishing Post Project Vegetation • Increase Scour Protection (cost implications) • Avoid Piers • Adopt an Adaptive Approach

  15. Questions?

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