El Charro Specific Plan Hydrology & Hydraulics Daniel J. Schaaf, PE Mary Eliza McNulty, PE.

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Presentation transcript:

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 cfs1,500 cfs

100yr Zone 7 Hydrology Q 100ex = 22,074cfs Q 100ult = 24,895cfs At Bernal

Impacts to 100yr Hydrology At Bernal Q 100ex = 22,074cfs Q north fill = 22,153cfs Q design = 21,983cfs

HMP Impacts 100yr At El Charro Rd

HMP Impacts 2yr At Bernal

Channel Characteristics Crosswinds

Channel Characteristics Proposed Bridge Site

Channel Characteristics Golf Course

Channel Characteristics Airway Blvd

Impacts of Sediment Removal to 100-Year Peak Flow Removing Sediment can decrease downstream peaks HMP can increase downstream peak TIMING!

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?

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

Questions?