TMDL Implementation Research Projects

This page presents information and research conducted in coordination with MDE and other entities that may inform TMDL implementation.​​

Is watershed restoration through stormwater permits (MS4s) working? Check out the following report that looks at monitoring data trends, aka BMP effectiveness monitoring.

 

MDE's Watershed Protection, Restoration, and Planning Program (WPRPP), in conjunction with the Interstate Commission on the Potomac River Basin (ICPRB), has compiled a comprehensive database of historic municipal seprate storm sewer system (MS4) permit required monitoring information, including chemical, biological, habitat, and geomorphic data for targeted sub-watersheds.  MDE, ICPRB, and the Center for Watershed Protection (CWP) have conducted pilot trend analyses of historic chemical monitoring data for three targeted sub-watersheds, which had the longest periods or record, fewest data quality issues, and ideal monitoring designs to relate any changes in ambient water quality to watershed restoration.  The comprehensive database and report summarizing the pilot trend analyses of the chemical data are available for download below.  MDE IWPP intends to conduct further pilot analyses of the biological and habitat data.  MDE WPRPP is currently working with ICPRB to populate the database with the geomorphic monitoring data.  The version of the database below only contains the chemical, biological, and habita data.  Once the geomorphic data is added to the database, an updated version will be posed.  Once MDE and ICPRB conclude the analysis of the biological and habitat data, those final reports will be posted as well. 


Can EPA's Watershed Management Optimization Support Tool (WMOST) be useful in optimizing implementation for local TMDL and Bay TMDL targets? The report available below shows results for the Cabin John Creek Watershed.

 
​EPA’s Watershed Management Optimization Support Tool (WMOST v3) is an application designed to facilitate cost-effective integrated water resource management at the scale of 12- to 10-digit Hydrologic Units (HUC12 – HUC10). A case study application of WMOST was carried out by EPA and MDE to evaluate the effectiveness of WMOST for informing management options for the heavily urbanized watershed of Cabin John Creek in Maryland, a tributary to the Potomac River, for the 10-year period 2014 - 2025.
 
WMOST provides optimizations in implementation strategies to meet constraints imposed by total nitrogen and total phosphorus load reduction targets associated with the Chesapeake Bay TMDL or the TSS loading reduction targets of the local non-tidal sediment TMDL with the least-cost solution. The Cabin John Creek WMOST implementation outcomes and evaluation of the software for management uses are provided in this report. 

The report and other related documents/data are available at:

WMOST general software documentation link:





How quickly does an estuarine system recover after upgrading a wastewater treatment facility to Enhanced Nutrient Reduction (ENR)?

 
​This study was conducted by the University of Maryland Center for Environmental Science (UMCES) on behalf of MDE and completed in 2019.  Looking at the Back River estuary and the upgrade of the Back River Wastewater Treatment Plant to ENR in 2017, the data which spans the time period from mid-1980s to 2018, shows the trend in the water column and sediment over time as loads in nitrogen, phosphorus and sediment were reduced.  The study indicates that well-mixed estuaries recover rapidly in response to nutrient remediation.  For full details of the study, click the link below.

Back River Sediment Flux Measurements to Assess Impacts of Large Reductions in Point Source Nutrient Loading, UMCES 2019​
Contact Information ​
 
Please direct questions or comments concerning this project to Maryland's TMDL Program at (410) 537-3818.​​​


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​​Additional Water Quality Restoration Resources





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