Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Computing TMDLs for Urban Runoff and Other Pollutant Sources.
Author Rossman, L. A. ;
CORP Author Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab.
Publisher Aug 91
Year Published 1991
Report Number EPA/600/A-94/236;
Stock Number PB95-138269
Additional Subjects Urban runoff ; Water pollution sources ; Nonpoint sources ; Water systems ; Urban hydrology ; Flow models ; Model studies ; Water quality management ; Environmental transport ; Reprints ; TMDL(Total Maximum Daily Loads) ; Total maximum daily loads ; Waste load allocations
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
NTIS  PB95-138269 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 03/06/1995
Collation 17p
Under the Clean Water Act, states are required to compute Total Maximum Daily Loads (TMDLs) for their priority water bodies. A TMDL determines the maximum pollutant loading from both point and nonpoint sources that a receiving water can accept without exceeding an allowable frequency of water quality excursions. Computing a TMDL is difficult because point source loadings are continuous in time while nonpoint source loadings occur only intermittently. A framework for determining a TMDL and its allocation among sources is developed, based on a modified form of continuous simulation. The approach is applied to an example problem of lead toxicity control within an urban catchment. Results show that it is possible to define the TMDL in an operationally useful way for simple receiving water systems, that the computed TMDL value depends on the level of nonpoint source source control selected, and that multiple combinations of equally effective point and nonpoint source control levels are possible.