TMDLS FOR LOW FLOWS – MANAGING QUANTITY FOR QUALITY
Abstract:This paper discusses the similarities and differences between Total Maximum Daily Load (TMDL) allocations and water use allocations under Washington State water resources law. Linkages exist both in the technical analysis and in TMDL implementation, because of the importance of flow to the analysis of pollutant fate and transport. Several case studies are presented to illustrate these issues. The Upper Chehalis dissolved oxygen TMDL relied on a detailed flow balance for TMDL modeling, and during implementation affected a variety of water resources decisions because of the impact of wastewater flow removal on instream flows and the impact of instream flows on pollutant assimilation. The Lower Snohomish Estuary dissolved oxygen TMDL became a significant issue in the transfer of a large water right that would have impacted water quality in the estuary. The Teanaway River Temperature TMDL included allocations and implementation measures that were closely tied to the effect of instream flow management on peak and low flows and on stream morphology.
Document Type: Research Article
Publication date: January 1, 2005
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