Technical Support Documents
The Twenty Needs Report: How Research Can Improve the TMDL Program. PDF format (1.1 MB) July 2002, EPA841-B-02-002, 43 pages
This report is a synthesis of the main research recommendations identified in many recent studies of TMDL science needs and research opportunities, prepared as an aid to research planning. The author developed this report in cooperation with EPA research laboratories while studying TMDL-related research within EPA, but the content of the report is useful to persons involved in water quality research in general.
Stressor
Identification Guidance, Dec. 2000, EPA 822-F-00-012
This guidance leads water resource managers through a rigorous process to
identify stressors that cause biological impairment in aquatic ecosystems and
to assemble cogent scientific evidence that supports conclusions about
potential causes.
Evaluation of Sediment Transport Data for Clean Sediment TMDLs, Nov. 2000 
This report was prepared by the National Sedimentation Laboratory of USDA's
Agricultural Research Service with funding provided by USEPA's HQ Watershed
Branch. The report provides a methodology to evaluate whether a stream or river
is impaired due to clean sediment. While this methodology shows promise in the
coastal plains province of the country, it needs to be further developed and
tested in other provinces of the country to establish its generality.
Protocol for Developing Pathogen
TMDLs: First Edition
PDF format
(2M), Jan. 2001, EPA 841-R-00-0002
Protocol for Developing Nutrient
TMDLs
PDF version (2.5MB), November
1999, First Edition, EPA 841-B-99-007
Protocol for Developing Sediment
TMDLs
, PDF version (1.8MB), October
1999, First Edition, EPA 841-B-99-004
Compendium of Tools for
Watershed Assessment and TMDL Development, 1997, EPA841-B-97-006
Other Web sites and Publications
Allocating Loads and Waste Loads
Web site provides information on watershed modeling frameworks which may be used to help evaluate the tradeoffs associated with different allocations. These frameworks are capable of identifying cost minimizing allocations and comparing cost distributions across stakeholders under different allocation scenarios. This web site demonstrates such a cost-minimization framework and provides examples of load allocations and cost distributions for a case study watershed.
EPA Office of Science and
Technology publications
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