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
7
100yr Zone 7 Hydrology
Q100ex 22,074cfs
Q100ult 24,895cfs
At Bernal
8
Impacts to 100yr Hydrology
At Bernal
Q100ex 22,074cfs
Qnorth fill 22,153cfs
Qdesign 21,983cfs
9
HMP Impacts 100yr
At El Charro Rd
10
HMP Impacts 2yr
At Bernal
11
Channel Characteristics
Crosswinds
12
Channel Characteristics
Proposed Bridge Site
13
Channel Characteristics
Golf Course
14
Channel Characteristics
Airway Blvd
15
Impacts of Sediment Removalto 100-Year Peak Flow
  • Removing Sediment can decrease downstream peaks
  • HMP can increase downstream peak
  • TIMING!

16
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?

17
  • 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

18
  • Questions?
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