scholarly journals Predicting lake water quality responses to load reduction: a three-dimensional modeling approach for total maximum daily load

2013 ◽  
Vol 11 (2) ◽  
pp. 423-436 ◽  
Author(s):  
Z. Wang ◽  
R. Zou ◽  
X. Zhu ◽  
B. He ◽  
G. Yuan ◽  
...  
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Three Dimensional ◽  
Total Maximum Daily Load ◽  
Load Reduction ◽  
Lake Water Quality ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Total Maximum ◽  
Daily Load

Linking trading ratio with TMDL (total maximum daily load) allocation matrix and uncertainty analysis

2008 ◽  
Vol 58 (1) ◽  
pp. 103-108 ◽  
Author(s):  
H. X. Zhang
Keyword(s):  
Water Quality ◽  
Uncertainty Analysis ◽  
Total Maximum Daily Load ◽  
Scientific Uncertainty ◽  
Preliminary Evaluation ◽  
Load Reduction ◽  
Trading Ratio ◽  
Total Maximum ◽  
Daily Load

An innovative approach for total maximum daily load (TMDL) allocation and implementation is the watershed-based pollutant trading. Given the inherent scientific uncertainty for the tradeoffs between point and nonpoint sources, setting of trading ratios can be a contentious issue and was already listed as an obstacle by several pollutant trading programs. One of the fundamental reasons that a trading ratio is often set higher (e.g. greater than 2) is to allow for uncertainty in the level of control needed to attain water quality standards, and to provide a buffer in case traded reductions are less effective than expected. However, most of the available studies did not provide an approach to explicitly address the determination of trading ratio. Uncertainty analysis has rarely been linked to determination of trading ratio. This paper presents a practical methodology in estimating “equivalent trading ratio (ETR)” and links uncertainty analysis with trading ratio determination from TMDL allocation process. Determination of ETR can provide a preliminary evaluation of “tradeoffs” between various combination of point and nonpoint source control strategies on ambient water quality improvement. A greater portion of NPS load reduction in overall TMDL load reduction generally correlates with greater uncertainty and thus requires greater trading ratio. The rigorous quantification of trading ratio will enhance the scientific basis and thus public perception for more informed decision in overall watershed-based pollutant trading program.

Water quality improvement by implementation of Proposition O in the Los Angeles river watershed, California

2008 ◽  
Vol 58 (12) ◽  
pp. 2271-2278 ◽  
Author(s):  
Mi-Hyun Park ◽  
Stephanie Pincetl ◽  
Michael K. Stenstrom
Keyword(s):  
Water Quality ◽  
Los Angeles ◽  
Total Maximum Daily Load ◽  
Water Quality Standards ◽  
River Watershed ◽  
Los Angeles River ◽  
The City ◽  
Total Maximum ◽  
Daily Load

Proposition O was created to help the City of Los Angeles comply with the Total Maximum Daily Load (TMDL) requirements under the Clean Water Act. In this study, the effectiveness of the Proposition O projects in Los Angeles River watershed was examined to show whether it achieves the goal of meeting water quality standards. Our analysis shows the most effective single project will remove at most 2% of pollutant loads from Los Angeles River Watershed and will not achieve TMDL compliance, although several projects can make important contributions to achieve compliance. The ranking results show that the projects that treat the runoff from the largest drainage area have the greatest impact on the water quality of Los Angeles river.

Incorporating uncertainty and objective load reduction allocation into the Total Maximum Daily Load process in Korea

2011 ◽  
Vol 15 (7) ◽  
pp. 1289-1297 ◽  
Author(s):  
Eun-Sung Chung ◽  
Kyung-Tae Kim ◽  
Kil Seong Lee ◽  
Steven J. Burian
Keyword(s):  
Total Maximum Daily Load ◽  
Load Reduction ◽  
Total Maximum ◽  
Daily Load
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