Total Maximum Daily Load Studies (TMDL)
Challenges with Total Maximum Daily Load Studies (TMDL)
The need for detailed plans describing the restoration of impaired waters is widely recognized in developed countries. TMDL studies outline the maximum amount of a pollutant a body of water can receive without violating water quality standards, and an allocation of that amount to the pollutant’s sources. Determining the Wasteload Allocation, the portion of a receiving water’s assimilative capacity that is allocated to one of its existing or future point sources of pollution, is often required in a TMDL study. Numerical modeling is an indispensable component of these studies.
Solutions Provided by EEMS
EFDC has been used in dozens of TMDL studies and is widely recognized in North America as the ideal tool for such work. The EE Modeling System has been refined over the years to provide users with everything they need to perform such studies quickly and efficiently including coupling with watershed model outputs, support for efficient iterative modeling, a range statistical analysis tools, powerful visualization features, and model to model comparison options.
Examples of Studies Done with EEMS
A watershed pollutant loading model and a receiving water quality/ hydrodynamic model for dissolved oxygen and nutrients were setup, calibrated, and validated. These models were used to develop TMDLs for the tidally influenced and impaired segment of Stevenson Creek, Florida.
Download Example EE Models
Download an example model and run with the free EEMS Demo Version.
Use EFDC_Explorer (EE) and EFDC+ to simulate hydrodynamics and and WQ in Lake Thonotosassa. These models were originally developed by DSI for use in EE training. Step-by-step guidance in how to build them are provided on our EE Knowledge Base.