The following is a collection of resources to aid in the creation, implementation and understanding of the Watershed Implementation Plans (WIPs).
Best Management Practices (BMPs) will play a vital role in the restoration of the Bay.
The U.S. EPA has developed a fact sheet which provides answers to frequently asked questions regarding how the Chesapeake Bay Program partnership credits agricultural conservation practices and the associated nutrient and sediment reductions in the Chesapeake Bay Watershed Model.
The Protocol for the Development, Review, and Approval of Loading and Effectiveness Estimates for Nutrient and Sediment Controls in the Chesapeake Bay Watershed Model describes the process a BMP must go through to be approved. Best Management Practices (BMPs) will play a vital role in the restoration of the Bay. For a table depicting the BMPs identified for review, as well as the status of the practice’s review, please visit ChesapeakeStat.
The Scenario Builder BMP Values table contains documentation for BMPs credited in Scenario Builder based on BMPs reported as used by the states. BMP reduction efficiencies for total nitrogen, phosphorus and sediment as well as the type of credit given in Scenario Builder for the BMPs are noted within.
This report, Developing Best Management Practice Definitions and Effectiveness Estimates For Nitrogen, Phosphorus and Sediment in the Chesapeake Bay Watershed , includes nutrient and sediment reduction effectiveness estimates of select agricultural, stormwater and forestry BMPs. With funding from the Chesapeake Bay Program Office, the University of Maryland Mid-Atlantic Water Program developed definitions and effectiveness estimates for BMPs that states were implementing or proposing to implement as part of their efforts to meet the nutrient and sediment reduction goals necessary to restore the Bay. The report provides realistic, science-based estimates of expected nutrient and sediment reduction performance from these BMPs and reflects current research and knowledge as well as average operational conditions representative of the entire Chesapeake Bay watershed.
The Chesapeake, Maryland, and Virginia Assessment and Scenario Tools (CAST, MAST, and VAST) allow users to rapidly develop scenarios with varying best management practices. Output includes nitrogen, phosphorus, and sediment loads from all sectors and sources and the acres of each BMP for any area in the Chesapeake Bay Watershed. These loads are consistent with the Chesapeake Bay Program’s Watershed Model. CAST also provides inputs to the Chesapeake Bay Program computer models.
Users can compare among scenarios to select the practices that reduce the most pollution and target these practices to the highest impact areas. Scenarios can be used for TMDL Watershed Implementation Plans, Milestones, or for local planning purposes.
The Chesapeake Bay Program uses many models to guide its decisions and approach. The following materials show these tools and their outputs.
Access Phase 5.3 Watershed Model input decks and outputs for information on land uses, BMP implementation, and edge-of-stream and delivered nutrient and sediment loads for key scenarios. Information is available by state, major basin, county, or land-river segment. Please refer back to this ftp site often for any new or updated files and contact Sucharith Ravie if you have questions.
Access Phase 5.2 Watershed Model loads, landuse acres, and BMP implementation data for key scenarios including 1985, 2002, 2008, 2010 Tributary Strategy, 2010 E3, and 2010 No-Action.
As of June 2, 2010, the Phase 5.3 version of Chesapeake Bay watershed model is available for download at ftp://ftp.chesapeakebay.net/Modeling/phase5/community/P53/. Please follow the steps outlined in the README file as you carry out your download. Since the Bay Program has made several changes to the model code and has run scripts since June 2, please re-download the run scripts and model code to keep up with the latest developments if you downloaded Phase 5.3 prior to that date.
Phase 5.3 Watershed Model Scenario Submissions
The Bay states and D.C. must use the following template when submitting Phase 5.3 Watershed Model scenario requests. The template and instructions are subject to change as new BMPs are added and approved and future phases of Scenario Builder are developed, so please refer back to this site for the most recent documents.
An input deck template, instructions, and example Scenario Builder input decks and outputs for 2009 Progress, 2010 Tributary Strategy, and 2010 E3 are available at ftp://ftp.chesapeakebay.net/Modeling/phase5/Phase53_Loads-Acres-BMPs/. The example inputs and outputs show the complete distribution of BMPs across all landuse types in relevant units (i.e., acres, feet, etc.) at the most detailed scale of land-river segments.
Scenario Builder is a computer tool that can generate simulations of the past, present or future state of the watershed to run through the Chesapeake Bay Watershed Model. This allows for the exploration of potential impacts of management actions and evaluation of alternatives.
Scenario Builder simulations are based on factors from a wide range of land uses and restoration activities. Using agriculture as an example, information such as acres of different crops, numbers of animals and extent of conservation practices is used to generate Watershed Model inputs of for agricultural land use types.
In support of the Chesapeake Bay Program's ongoing commitment to scientific integrity, openness and transparency in its computer models and Chesapeake Bay TMDL development, several components of Scenario Builder are provided. These include the programming code for Scenario Builder and the input decks and outputs for the states' draft Phase I Watershed Implementation Plans, Hybrid Backstop TMDL and Full Backstop TMDL. The scenario builder documentation references the information and decisions used in creating this modeling tool used by the Chesapeake Bay Program Partnership for decision making.
Model Segmentation Viewer
The segmentation viewer allows partners to overlay Phase 5 Watershed Model Segments with layers including streets, satellite imagery, shaded relief, MS4 areas, 12-digit watersheds, and counties. This tool will allow local planners the ability to see and verify where specific segments are in relation to other boundaries and features, aiding in the decision-making process.
Relative Effectiveness Factors
Download spreadsheet for the relative effectiveness factors used in Phase 5.3.
The MS4 Shapefile, as well as related information can be found at the link provided below. This shapefile is the file used to map the MS4s within the Bay watershed. Note: the file found at this link may periodically change. Please check back on a regular basis for the most up-to-date files. Please direct any questions to Guido Yactayo.
Federal Land Shapefile
The Federal Lands Shapefile and related information can be found at the link provided below. This shapefile is the file used to map Federal Lands within the Bay watershed. Note: the file found at this link may periodically change. Please check back on a regular basis for the most up-to-date files. Please direct any questions to Guido Yactayo.
The documents provided below include the expectations and consequences associated with this process, as well as guidance information.
The following letters provide information from EPA to the jurisdictions regarding the TMDL:
A Guide for EPA’s Evaluation of Phase I Watershed Implementation Plans includes details on how EPA will review and evaluate the Chesapeake Bay TMDL Phase I Watershed Implementation Plans submitted by each of the states and the District of Columbia. For contact information, please consult this list of WIP Evaluation Team Leads.
A recurring theme at meetings is the need for more cutting-edge research and new technologies. EPA is providing funding to pilot projects to begin to conduct needed research and explore untapped options. This document summarizes the process already underway.
The Tributary Strategy plans to reduce pollution to the Chespeake Bay have been replaced by the state-developed Watershed Implementation Plans (WIPs), available on this webpage, and a federal Total Maximum Daily Load (TMDL).
District of Columbia