1 / 12

Earth Systems Pacific

A merican S ociety of C ivil E ngineers San Luis Obispo February 28, 2013 Stormwater Technical Training: Central Coast Post-Construction Stormwater Management Requirements Robert Down, PE, MASCE rdown@earthsys.com. Earth Systems Pacific.

ethel
Download Presentation

Earth Systems Pacific

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. American Society of Civil EngineersSan Luis ObispoFebruary 28, 2013Stormwater Technical Training: Central Coast Post-ConstructionStormwater Management RequirementsRobert Down, PE, MASCErdown@earthsys.com Earth Systems Pacific

  2. Initial Site Assessment (Overall) When: Early (and often)What: Seeps/Springs Rock Outcrops Drainage Courses Infiltration Potential Geotechnical Hazards Who: Maps Local Professionals

  3. Geotechnical Hazards Landslides Collapsible Soils Expansive Soils Liquefaction Potential Moisture/Water IntrusionCan Lead to Technical Infeasibility

  4. Technical Infeasibility “Sites where Soils Types Significantly Limit Infiltration”

  5. Site Assessment (Specific) Preliminary Planned Control Measures Planned Location/Depth Importance of Facility Planned Infiltration (Partial or Full)

  6. Site Assessment - Testing Soil Borings Subsurface Profile Groundwater Bedrock Permeable Layers

  7. Site Assessment - Infiltration Testing Regional Requirements Local Recommendations Infiltration Testing Shallow -Underdrain Shallow - Infiltration Deep - Overflow Deep - Critical

  8. Interpretation of Test Data Correction/Reduction FactorsWashington State Department of Ecology 2005

  9. Interpretation of Test Data Correction/Reduction FactorsWashington State Department of Ecology 2012

  10. Interpretation of Test Data Correction/Reduction FactorsSoutheast Michigan Council of Governments 2008Reduction Factor (Rf) = ((2d1 - Δd)/(DIA)) + 1City of Los Angeles 2012 Factor of Safety of 3 if Infiltration Tests Performed Factor of Safety of 6 if Borings Only

  11. Design and Construction Remember This is not Construction

  12. Questions ? Earth Systems Pacific

More Related