lid presentation
DESCRIPTION
Presented this to local private firms and city engineers regarding the upcoming LID regulations coming down the pipe...TRANSCRIPT
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Low Impact Development
Adjusting to the New Storm Water Paradigm
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What is LID?
• A site-specific, conceptual approach to minimize the detrimental effect of hydromodification
• LID Goal - Mimic the natural hydrologic cycle• Site-specific – Designs will change per locale• Conceptual – Qualitative not quantitative• Approach – Needs to be addressed and included from the
inception of the project• Development – LID requirements are currently focused exclusively
on new developments and significant* redevelopments• Hydromodification – the unnatural redirecting of stormwater
![Page 3: LID Presentation](https://reader036.vdocuments.mx/reader036/viewer/2022081720/54869593b47959f10c8b5282/html5/thumbnails/3.jpg)
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Evolution of Storm Water Treatment Three Main Phases
• Phase I: Conventional Model (pre-70’s)– Collect and ConveyPROBLEM: Point-source pollution, hydromodification
• Phase II: Retention Model, BMPs (80’s and 90’s)– Flow, Volume and Source/Treatment ControlPROBLEM: Hydromodification, maintenance
• Phase III: Low Impact Design Model (2000+)– Mimicking Natural HydrologyPROBLEM: Adequate treatment? Flooding? Implementation?
Involvement?
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Progression of Legislation
• Clean Water Act of 1972– Set goals for all national waters to be free of all discharges
causing pollution– Required TMDLs for impaired watersheds
• NPDES Permits (Section 402 CWA)– Storm Water Pollution Prevention Plan– Storm Water Management Plan– Development Standards Plan
• State Board’s Sustainability Resolution (2005-2006)
• NPDES Permits now shifting to LID– Contra Costa County Phase I NPDES Permit (2005)– Stockton Phase I NPDES Permit (Dec. 2007) – Upcoming statewide Phase II NPDES Permit (~ March 2009)
![Page 6: LID Presentation](https://reader036.vdocuments.mx/reader036/viewer/2022081720/54869593b47959f10c8b5282/html5/thumbnails/6.jpg)
What is LID?
• Site-specific, conceptual approach of developing property to minimize the detrimental effect of hydromodification and pollution
• LID Goal - Mimic the natural hydrologic cycle• Site-specific – Designs will change per locale• Conceptual – Qualitative not quantitative• Approach – Needs to be addressed and included from the
inception of the project• Development – LID requirements are currently focused exclusively
on new developments and significant* redevelopments• Hydromodification – the unnatural redirecting of stormwater
![Page 7: LID Presentation](https://reader036.vdocuments.mx/reader036/viewer/2022081720/54869593b47959f10c8b5282/html5/thumbnails/7.jpg)
Hydrologic Cycle
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Natural Infiltration
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Our Mokelumne
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Example of Erosion caused by Hydromodification
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Natural Balance of Erosion and Deposition
After Lane (1955) as cited in Rosgen (1996)
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Environmental Benefits of LID
• Cost Effective - less treatment, less conveyance, less maintenance, less fines, etc.
• Mitigates downstream flooding, erosion and aggradation
• Helps control water quality
• Preserves stream base for riparian ecosystems
• Helps recharge groundwater
• Preserves natural temperatures in receiving waters
• Multifunctional: landscaping, aesthetics, native vegetation, social benefits, open space use, etc.
• Resilient and adaptable to various climates
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Functional Benefits of LID
• Treats first flush runoff– Majority of contaminants
• Treats common small/medium-size storm– Majority of storms
• Design includes overflow for large storms– Conventional MS4 used as back-up
• Aesthetically pleasing
• Easy to maintain
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Ways to Mimic Natural Hydrology
• Know your natural hydrology!• Soil quality improvement• Native and drought tolerant vegetation• Trees• Maximize pervious surfaces• Disconnect impervious surfaces from storm
drain - disconnect downspouts, rain barrels, • Bioretention – Rain Gardens, swales• Green Roofs?
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LID Examples
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The Big Challenge - Implementation
• Statewide Quantitative Standards– TMDLs– Sizes of IMPs– Regulator-based
• Local Qualitative Standards– Permittee-based– Matching local conditions
• The Main Need – Local Involvement– Planning Department, Engineering Firms,
Construction Firms, Landscape Architects, Environmental Consultants, Field Technicians…
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Current Implementation Approaches for LID
• Contra Costa County - C3 Guidebook 4th Edition– IMPs for 4% of impervious surface– Present challenge is to find proper soil type– www.cccleanwater.org/newdevelopmentc3/
• Santa Barbara’s New NPDES Permit– http://www.santabarbaraca.gov/Resident/Community/Creeks/Storm_
Water_Management_Program.htm
• City of Stockton’s new NPDES Permit– Revision of SWQCCP currently in progress– Stakeholder meetings in progress– www.stocktongov.com/mud/General/stormwater/SQCCP.cfm
• Phase II NPDES Permits– Expected March 2009
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Recent Funding Opportunity – Proposition 84
• Matching Grants for sustainable, long-term water quality projects which reduce and prevent stormwater contamination of rivers, lakes and streams
• LID projects will take priority for grants• 20% match for most cities and towns in delta
area• $250,000 to $500,000 grants per project• 2 Phases of grants
http://www.waterboards.ca.gov/water_issues/programs/grants_loans/prop84/index.shtml
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New Developments?! Where? Will that really make a difference?
• We have to start somewhere
• Retrofitting is too costly
• Use of grant money may show the success of LID and direct projects to existing developments
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LID Opportunities for WGR
• Expert knowledge of NPDES requirements
• Ensuring clients with LID compliance
• Knowledge of local soils and hydrology
• Filling in needs to facilitate implementation
• Geographic Informational Systems (GIS)
• Offering compliant LID design concepts
• Constructing and maintaining LID sites
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Closing Comments
• Unexplored Territory Ahead
• Opportunity for Sustainable Change
• A whole new market
• Share Ideas. Let’s go forward intelligently. Foster awareness.
• Goal – See WGR as the Central Valley Leader in innovative LID solutions!
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Thanks for Listening!
Any Questions or CommentsPlease call Chris @ (209) 334-5363 ext. 214
WGR Southwest, Inc.315 W. Pine St.Lodi CA 95240
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Restoring Soil Function
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Soil Health
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Riparian Zone