Enhancing Water Quality Through Effective Post-Construction BMP Strategies
This document outlines essential design standards and long-term Best Management Practices (BMPs) that help mitigate runoff impacts from completed construction projects. It targets the reduction of impervious areas, limits pollutant exposure, and supports water quality goals through effective BMP implementation. The program includes ordinance requirements for developers, site design strategies, and long-term maintenance procedures. Key BMP options include vegetated swales, detention basins, and constructed wetlands, aiming to protect aquatic resources and ensure sustainable development practices.
Enhancing Water Quality Through Effective Post-Construction BMP Strategies
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Presentation Transcript
From the Beginning Design Standards and Other Post-Construction Program Elements
Post-Construction BMPs Long term BMPs that help protect runoff throughout the life of the completed project
Impervious Area • More runoff, More Pollutants
Water Quality Goals Reduce impervious area Limit pollutant exposure Diminish pollutant transport Program Goals Process to ensure that “Water Quality Goals” are met Post Construction Goals
Program • Ordinance requiring developers to incorporate post construction BMPs • Strategy of BMPs • Enforcement of ordinance • Long-term operation and maintenance of BMPs
Ordinance • Model Ordinance • www.stormwatercenter.net • Model Urban Runoff Program • Reference to separate document
BMP Strategy • Site and watershed conditions • constraints • topography • areas to utilize • Pollutants of concern • 303(d) list • pollutants expected to be present • Options • Sizing
BMPs Treatment Source Control Site Design
Site Design • Minimize building footprint • Cluster development (leaving more useful open space) • Minimize directly connected impervious areas (DCIA) • direct roof downspouts to landscape areas • Protect slopes and channels • Aquatic buffers
Source Control • Outdoor material storage areas • Trash enclosures • Equipment wash areas
Treatment • Vegetated swales • Detention basins • Constructed wetlands
Attachment 4 - Design Standards Conserve Natural Areas Limit Directly Connected Impervious Area Parking Lots Restaurants Retail Gasoline Outlets Vehicle Equipment Wash Areas Storage Volume Treatment Flow Requirements
Enforcement • Site Plan Review • Checklist • Site Inspection • As part of final approval
Maintenance • Legal agreements • Conditional use permits • Homeowner’s association • Conditions, covenants, and restrictions • Databases • Inspections checklists
