LOW IMPACT DEVELOPMENT APPROACHES

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Presentation transcript:

LOW IMPACT DEVELOPMENT APPROACHES Clean Water Services LOW IMPACT DEVELOPMENT APPROACHES HANDBOOK

The LIDA Handbook Clean Water Services Prepared by: Clean Water Services Internal Staff GreenWorks PC Lori Faha In Cooperation with the Tualatin Basin Natural Resources Coordinating Committee

LIDA Handbook Purpose The Clean Water Services Design & Construction Standards (2008, as amended) present Low Impact Development Approaches as an option for meeting stormwater quality requirements and refer to the LIDA Handbook. The LIDA Handbook provides detailed design guidance for LIDA facilities.

Handbook Overview Chapter 1 – Introduction What are LIDAs & why use them Chapter 2 – Site Planning for LIDAs Site Analysis & Planning for LIDAs Selecting LIDAs to match site conditions Chapter 3 – LIDA Design Process Design steps, LIDA Sizing Form Chapter 4 – LIDA Fact Sheets Specific design info for each LIDA Appendices Glossary, additional resources, maintenance, detail drawings

LIDA Handbook Applicability When to Use Site planning and design stages for projects inside CWS service area When designing any water quality facility or LIDA (contains info for both) Use in conjunction with CWS Design & Construction Standards

What Are LIDA’s? LIDAs offer more options to comply with stormwater management requirements, and complement the water quality facilities and vegetated corridors that have been established as part of the Standards. The five objectives of LIDA are to: 1. Conserve Existing Resources 2. Minimize Disturbance 3. Minimize Soil Compaction 4. Minimize Imperviousness 5. Direct Runoff from Impervious Areas onto Pervious Areas

LIDA SWALE GREEN ROOF

POROUS PAVEMENT VEGETATED SWALE

EXTENDED DRY BASIN CONSTRUCTED WATER QUALITY WETLAND

INFILTRATION PLANTER

FLOW-THROUGH PLANTER VEGETATED FILTER STRIP

Why LIDA? LIDAs add more options to the toolkit of stormwater management techniques LIDAs will reduce flashy runoff flows and other impacts of urban development on stream health LIDAs can help the County and Cities meet Tualatin Basin Goal 5 plan

Developer Incentives LIDAs may be integrated with site landscaping LIDA design may reduce earthwork and piping Planning Dept’s may offer density or building size bonuses or other incentives LEED credits

Encouraging LIDA’s in Site Planning Effective Stormwater Management is best achieved through integration of stormwater objectives at the beginning of site planning.

Site Design Process Using LIDA Conserve Existing Resources Minimize Disturbance Minimize Soil Compaction Minimize Imperviousness Direct Runoff from Impervious Areas onto Pervious Areas

How to Select LIDA Facilities Considerations: Infiltration vs. flow-through facilities Public vs. private facilities Adjacency of Vegetated Corridors

Integrating LIDAs Into Site Design PARKING AREAS

Integrating LIDAs Into Site Design STREETS

Integrating LIDAs Into Site Design LIDAs FOR BUILDINGS & ADJACENT AREAS

LIDA Design – Fact Sheets

Appendices Glossary of terms Web links to additional resources O&M CAD Details

LIDA Operation & Maintenance Maintenance Agreement Requirements Maintenance Checklists: Overview Use as an inspection & enforcement tool

Carrie Pak, PE Engineering Division Manager pakc@cleanwaterservices Carrie Pak, PE Engineering Division Manager pakc@cleanwaterservices.org 503.681.3646