El Charro Specific Plan Hydrology - PowerPoint PPT Presentation

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El Charro Specific Plan Hydrology

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El Charro Specific Plan Hydrology – PowerPoint PPT presentation

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Title: El Charro Specific Plan Hydrology


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

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Diverse Channel
12,000 cfs
1,500 cfs
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100yr Zone 7 Hydrology
Q100ex 22,074cfs
Q100ult 24,895cfs
At Bernal
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Impacts to 100yr Hydrology
At Bernal
Q100ex 22,074cfs
Qnorth fill 22,153cfs
Qdesign 21,983cfs
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HMP Impacts 100yr
At El Charro Rd
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HMP Impacts 2yr
At Bernal
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Channel Characteristics
Crosswinds
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Channel Characteristics
Proposed Bridge Site
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Channel Characteristics
Golf Course
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Channel Characteristics
Airway Blvd
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Impacts of Sediment Removalto 100-Year Peak Flow
  • Removing Sediment can decrease downstream peaks
  • HMP can increase downstream peak
  • TIMING!

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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?

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  • 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

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  • Questions?
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