Urban Toxic Contaminants in the Chesapeake Bay

Can stormwater BMPs that are used to reduce nutrient and sediment loads for the Bay pollution diet also offer additional benefits to reduce toxic contaminants ?
Learn more…

Homeowner BMP Guide

CSN’s newly released Homeowner BMP Guide presents a step by step approach for analyzing your property to find out whether it makes sense to install a rain garden or other residential stewardship practices.
Learn more…

Technical Bulletin No 10: Bioretention Illustrated!

A Visual Guide for Constructing, Inspecting, Maintaining and Verifying the Bioretention Practice
Learn more…

Design Specification No 15: Extended Detention Pond
Extended Detention Pond

An extended Detention pond relies on 12 to 24 hour detention of stormwater runoff after each rain event; an under-sized outlet structure restricts stormwater flow so it backs up and is stored within the basin.
Learn more…

Design Specification No 14: Wet Pond
Wet Pond

Wet ponds consist of a permanent pool of standing water that promotes a better environment for gravitational settling, biological uptake and microbial activity.
Learn more…

Design Specification No 13: Constructed Wetlands

Constructed wetlands are shallow depressions that receive stormwater inputs for water quality treatment, are typically less than 1 foot deep, and possess variable microtopography to promote dense and diverse wetland cover.
Learn more…

Design Specification No 12: Filtering Practices
Stormwater Filter

Stormwater filters depend mainly on physical treatment mechanisms to remove pollutants from stormwater runoff, including gravitational settling in the sedimentation chamber, straining at the top of the filter bed, and filtration and adsorption onto the filter media.
Learn more…

Design Specification No 11: Wet Swale
Vegetated wet swale

Wet swales can provide runoff filtering and treatment within the conveyance system and are a cross between a wetland and a swale.
Learn more…

Design Specification No 10: Dry Swales
Dry Swale

Dry swales are essentially bioretention cells that are shallower, configured as linear channels, and covered with turf or other surface material (other than mulch and ornamental plants).
Learn more…

Design Specification No 9: Bioretention

Bioretention creates a good environment for runoff reduction, filtration, biological uptake, and microbial activity, and provides high pollutant removal; bioretention can become an attractive landscaping feature with high amenity value and community acceptance.
Learn more…