Managing Stormwater Through LID to Restore an Urbanized Watershed - PowerPoint PPT Presentation

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Managing Stormwater Through LID to Restore an Urbanized Watershed

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Managing Stormwater Through LID to Restore an Urbanized Watershed
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Managing Stormwater Through LID to Restore an Urbanized Watershed

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  1. Managing Stormwater Through LID to Restore an Urbanized Watershed Wisely Managing Our Urban Water Resources Neal Shapiro, City of Santa Monica LID Training, Marina del Rey June 28, 2007

  2. OBJECTIVES Harvest urban runoff (dry/wet weather) for reuse (recharge or direct use) and pollution treatment Treat all dry weather and some wet weather urban runoff leaving the City Connect land use/design to the Hydrologic Cycle, reducing the disconnect and disruption of water flow Mimic nature; blend into the land Take proactive, watershed approach to reducing urban runoff problems Convert a perceived “waste” into a valuable resource for reuse - SMURRF

  3. The Southern California Coastal Water Research Project, a leading marine research group in Southern CA, reported that storm water and urban runoff are the leading source of water pollution in the Los Angeles area; storm water pollution has increased 200-700 percent during the last 20 years. Stormwater has become a lethal cocktail of pollutants that now constitutes the single greatest source of water pollutants, contributing 50-60 percent of the pollutant load. Types and Sources of Pollutants According to the US EPA, urban stormwater is the largest source of water quality damage in estuaries, the second largest for wetlands degradation, third largest impairment of lakes and fourth largest source of river damage. Urban Runoff – What is it?The Problem – Water Quality v. Quantity

  4. The Watershed Level –Disrupting the Water Cycle • How water flows through our environment

  5. As hardscapes increase, water quality goes down.

  6. Turning Impermeable to Permeable

  7. Santa Monica: Tourist Destination

  8. City Attractions

  9. An Environmentally Concerned Community • Concern Over the Environment • History of Political Activism

  10. City Staff Working Together to Do More with Less Finance – parcel/runoff fees, grants Open Spaces - Pets Wastewater – CB/SD cleaning Engineering – BMP design in new projects; Airport gunite Street Sweeping Building & Safety - COOs Resource Management Urban Runoff - EPD GIS – mapping CB/SDs, BMP locations Planning – start of new project City Attorneys – ordinances, enforcement, contracts Enforcement – wasting water, no BMPs, pollutant spills Solid Waste – recycling/trash spills Utilities – ind. waste, recycled water Parks/Recs - irrigation

  11. Education • Prevention • Ordinances • Treatment • Maintenance • Enforcement • Funding Tools of the Trade

  12. Urban Runoff Pollution Code Stormwater Utility Parcel Code Local Building Code Local Zoning Code Sustainable City Code ORDINANCES

  13. New Development Threshold: Value of new construction is 50% or greater compared to the replacement cost of the existing improvement Stricter standard than LA Regional Water Board Standard; all land uses About $1.2 million annually New Development & Runoff Mitigation Plan, including City projects Retain 0.75” Good Housekeeping BMPs Construction Site BMPs Penalties - $500/day Flexibility In-Lieu Fee/Mitigation Banking Urban Runoff Mitigation, Stormwater Parcel Fee, UR Mitigation

  14. Number of Projects Single-Family: 240 Multi-Family: 65 Commercial: 70 Unknown: 70 City: 12 BMP Ave. Costs: $0.50 - $3.50 per gallon, one-time <1.5% of total project cost Design Storage (gallons) Single-Family: 184,000 Multi-Family: 130,000 Commercial: 342,000 City: 100,000 Results Since 1993


  16. Managing NPS Pollution:How the City URMP Works Primary Strategy: Infiltration through Smart Growth, Low Impact Development strategies Secondary Strategy: Multi-POC Treat & Release strategies

  17. Brochures Radio / TV Spots Newspaper Articles/Ads City’s Web Sites & Green Building Web Site Catch Basin Stencils/Tiles Educational Information at Facilities City Employee Training EDUCATION & PREVENTION

  18. Brochures and Handouts

  19. City’s Web

  20. Pier/Catch Basin Signage 310.458.8945

  21. Pet Walk Parks

  22. Design Standard: 0.75 inch storm event

  23. Inspections City of SM Photo Description

  24. Catch Basin/Storm Drain Inserts TREATMENT – Local

  25. Catch Basin Screens

  26. Screening Catch Basin Insert

  27. Filtering Catch Basin Insert

  28. Onsite Basin with Trash Insert

  29. Onsite Basin with Filter Insert

  30. Onsite Basin with Filter Insert

  31. Separation and Filtering (in-line) Devices Devices installed as maintenance holes or diversion structures Infiltration fields Porous surfaces TREATMENT – Large Area

  32. Separation Device Trash, debris, sediments, oil, grease

  33. Filtering Device –solubles: metals, organics, nutrients

  34. Onsite Retention City Facilities

  35. Permeable Paving

  36. Virginia Avenue Park

  37. Virginia Avenue Park