What is the Stormwater System
- Description of System
- Watershed Map

Why It's Regulated
 - What is NPDES
     Phase I Requirements
     Phase II Requirements

Where Stormwater
Pollution Comes From

- Residential
- Streets and Highways
- Construction Sites
- Industry
- Stores and Offices
- Farms and Agriculture

What's Being Done by NCCO
and DelDOT

- Monitoring Programs
     Dry Weather
     Wet Weather
- Drainage System Inventory
- Planning
- Construction Sites
- Streets and Highways
- BMPs
     Structural
     Non-Structural
- Public Education
- Maintenance Corporation

Publications

How You Can Help
- Household Chemicals
- Landscaping and Gardening

Glossary

Frequently Asked Questions

How to Report Problems

Links

Contact Us

   
 
Best Management Practices (BMPs)

New Castle County and DelDOT operate and maintain public streets, roads, and highways to minimize the discharge of pollutants. Stormwater Best Management Practices or BMPs are practices that are used to reduce pollutants typically present in stormwater runoff, prior to the runoff entering streams and rivers. There are two types of stormwater BMPs; Structural BMPs and Non-Structural BMPs.

DelDOT has begun a long-term Best Management Practice (BMP) performance monitoring and research program. This includes wet weather monitoring of stormwater outfalls and BMPs, as well as chemical and biological monitoring of streams that receive stormwater discharges from DelDOT maintained BMP's. Long-term objectives of DelDOT’s BMP monitoring program include the following:

 
  • Quantifying pollution removal abilities of BMPs
  • Identifying types and amounts of pollutants present in stormwater discharges from DelDOT maintained roads.
  • Determining potential impact of stormwater discharges on water quality
  • Assuring compliance with regulatory standards
  • Provide design engineers with additional treatment options for difficult site-specific situations
  • Evaluating emerging stormwater treatment technologies
  • Determining unique problems, and solutions to problems, that occur with structural BMP retrofits.
  • Integrating DelDOT monitoring with watershed monitoring already being done by the Delaware Department of Natural Resources and Environmental Control (DNREC) and others—an integrated biological, physical and chemical monitoring and assessment approach