Scope and Purpose
The charge of the cross-sector Watershed Technical Workgroup is to provide a forum for communication and discussion between and among the jurisdictions and other CBP participants on technical issues related to Best Management Practices (BMPs), Chesapeake Bay Watershed Model processes, and management strategy development and implementation. Functions include:
• Support the Water Quality Goal Implementation Team (WQGIT) and the greater Bay Program partners in implementing management strategies to achieve the nutrient and sediment reductions necessary to restore the Bay.
• Review and approve the recommended BMP definitions and efficiencies from source workgroups and local jurisdictions, in collaboration with the Scientific and Technical Advisory Committee (STAC) and WQGIT workgroups. Ensure that BMPs are consistent across sectors.
• Review and approve how BMPs are simulated in the Watershed Model to ensure that the assumptions accurately reflect real world conditions and are consistent and equitable between the different sectors.
• Review and approve how BMPs are tracked and reported by CBP partner jurisdictions and agencies for use in the Watershed Model to ensure that the assumptions accurately reflect real world conditions and are consistent and equitable between the different sectors.
• Provide technical review & recommendations to the CBP Modeling team on Watershed Model Processes and input data.
• Review and/or assess scoping scenarios, as needed.
Projects and Resources
CAST Update Tracker
- CAST Update Tracker (docx - 27.813 KB)
Phase 7 Model Development
Currently in development, the Phase 7 Modeling Tools will be used by the partnership to inform decisions related to nutrient and sediment reduction goals outlined in the Chesapeake Bay Watershed Agreement. Evolving plans and related documents can be found on this site:
WTWG Voting Membership (chair, signatory, and at-large members)
- WTWG Voting Membership 2022- 2023 (pdf - 177.207 KB)
WTWG New Member Training Guide
- TWG New Member Training Guide (v12.14.2021 - FINAL) (pdf - 896.349 KB)
WQGIT approved final report from the Agricultural Ditch Management Expert Panel.View details
The Chesapeake Bay On-site Wastewater Nitrogen Removal BMP Expert Review Panel was reconvened to specifically evaluate two proposed BMPs:
- Drip irrigation (at a higher TN reduction credit than currently given under the “Shallow-Placed, Pressure-Dosed Dispersal” BMP) and
- Peat biofiltration systems discharging to a pad or trench
Upon review of available data, the Panel recommends creating a new, creditable BMP for Drip Irrigation, which has been shown to result in a 50 percent net TN reduction through Zone 1 in the drainfield. Qualifying characteristics for the new BMP, which are described in detail in the report, require the use of pressure compensating emitters, maximum not to exceed loading rates for three different soil types and exclusion of the credit for drip systems installed in Type I (sand textured) soils.
The Panel recommends that peat systems discharging to a pad or trench not be included by the CBP as a new BMP. In particular, existing data were from studies not designed to explicitly address nitrogen removal and the TN results were highly variable and thus inconclusive. The data do appear to support crediting peat filters a 20 percent net TN reduction as an ex situ BMP, consistent with similar technologies which fall under creditable BMPs: Intermittent Media Filters and NSF Standard 40 Systems.
The Panel further recommends that the CBP track efforts underway in EPA Regions 1 and 2 to develop nitrogen sensors specific to monitoring on-site wastewater systems and to consider using such sensors (or other appropriate methods) to verify the performance of BMPs that have been approved and are being implemented in the watershed. Recommendations for outstanding research questions are also provided (the reader is further referred to the 2014 predecessor report on OWTS Nitrogen Removal BMPs and the 2016 OWTS Nitrogen Attenuation report for additional recommendations for the CBP).View details
Recommendations of the Expert Panel to Define Removal Rates for Shoreline Management Projects (WQGIT Approved 7/13/15, WTWG Revised 6/1/17).View details
Cassandra Davis (Chair), New York State Department of Environmental Conservation
Albany, Newyork 12233
Ruth Cassilly (Coordinator), Non-point Source Policy Analyst, University of Maryland Cooperative Extension
Jackie Pickford (Staffer), Water Quality Goal Implementation Team Staffer, Chesapeake Research Consortium
1750 Forest Drive Suite 130
Annapolis, Maryland 21401
Bill Keeling, Virginia Department of Environmental Quality
Gregorio Sandi, Maryland Department of the Environment
1800 Washington Blvd.
Baltimore, Maryland 21230
Alana Hartman, West Virginia Department of Environmental Protection
Jeff Sweeney, Integrated Analysis Coordinator, U.S. Environmental Protection Agency
Chris Brosch, Delaware Department of Agriculture
Lauren Townley, New York State Department of Environmental Conservation
Normand Goulet, Northern Virginia Regional Commission
Jessica Rodriguez, U.S. Department of Defense (DOD)
1510 Gilbert Street, Building N26
Norfolk, Virginia 23511
Alicia Ritzenthaler, District of Columbia Department of Energy & Environment (DOEE)
1200 First Street NE
Washington, Districtofcolumbia 20002