For a Water Quality Limited stream segment that requires a TMDL, the State must quantify the pollutant sources and allocate allowable loads to the contributing sources, both point and nonpoint, so that water quality standards can be attained for that segment. TMDL development is a rational method for weighing the competing pollution interests and developing an integrated pollution reduction strategy for point and nonpoint sources.
TMDL development includes these five basic steps:
1. select the pollutant to consider,
2. estimate the water body assimilative capacity,
3. identify the contribution of that pollutant from all significant sources,
4. analyzes information to determine the total allowable pollutant load,
5. allocate (with a margin of safety), the allowable pollution among the sources so that water quality standards can be achieved.
The complexity of the TMDL development is determined by water body, the sources and the pollutant being considered. While not all segments and TMDL's require complex computer modeling, some do.
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