scholarly journals Deterministic and probabilistic approaches to the development of pH total maximum daily loads: a comparative analysis

2007 ◽  
Vol 9 (3) ◽  
pp. 203-213
Author(s):  
A. Elshorbagy ◽  
K. Parasuraman ◽  
G. Putz ◽  
L. Ormsbee
Keyword(s):  
Water Quality ◽  
Probabilistic Approach ◽  
Quality Standards ◽  
Deterministic Approach ◽  
Water Quality Standards ◽  
Total Maximum Daily Loads ◽  
Creek Watershed ◽  
Margin Of Safety ◽  
Maximum Daily Loads ◽  
Total Maximum

The most commonly used deterministic approach to the development of total maximum daily loads (TMDLs) fails to explicitly address issues related to a margin of safety and inherent variability of streamflows in the process of TMDL development. In this paper, the deterministic approach to pH TMDL development for Beech Creek watershed, Muhlenberg County, Kentucky, proposed by Ormsbee, Elshorbagy and Zechman is discussed. The shortcomings and the limitations of the assumptions associated with the deterministic approach are highlighted. An alternative probabilistic approach, to cope with the percentile-based water quality standards based on Monte Carlo simulation, is presented and compared to the deterministic approach. The proposed probabilistic approach provides a deeper insight into the issue of uncertainty and emphasizes the importance of handling the water quality standards and TMDLs in terms of magnitude and frequency rather than a single-valued approach. Expected exceedances and the confidence of compliance with percentile-based standards are estimated. Accordingly, an objective method of estimating the margin of safety for pH TMDLs is proposed.

Spatial and temporal pollutant budget analyses toward the total maximum daily loads management for the Yeongsan watershed in Korea

2007 ◽  
Vol 55 (1-2) ◽  
pp. 367-374 ◽  
Author(s):  
S.J. Ki ◽  
Y.G. Lee ◽  
S.-W. Kim ◽  
Y.-J. Lee ◽  
J.H. Kim
Keyword(s):  
Water Quality ◽  
Oxygen Demand ◽  
Volumetric Flow Rate ◽  
Control Approach ◽  
Total Maximum Daily Loads ◽  
Wide Range ◽  
Management Plans ◽  
Maximum Daily Loads ◽  
The City ◽  
Total Maximum

This paper delivers two issues: water quality in the Yeongsan (YS) watershed which is one of the major watersheds in Korea and new watershed management plans with respect to the total maximum daily loads (TMDL) management. Field studies were conducted to estimate the pollutant loads according to the spatial and temporal distribution based on the biochemical oxygen demand (BOD) concentration and the volumetric flow rate (VFR) data from YS watershed. The results of both spatial and temporal analyses show the main pollutant source was originated from the city of Gwangju and the pollutant load from the city to YS watershed was the most out of five cities during this study period. Concerning YS reservoir located downstream of YS watershed, it also shows the worst water quality in the entire watershed during the study period. These results collectively demonstrate that the city of Gwangju is a main region which generates numerous point and non-point pollutant sources and eventually the pollutants are accumulated in YS reservoir. Based on the results, we suggest two different management plans for YS watershed. One is the flow-control approach that is to increase the amount of dam discharge in order to guarantee the river management flow for the midstream region. The other is the mass-control approach that is to dredge the contaminated sediments in YS reservoir for removing pollutants chronically accumulated in the sediment. Simulations for the former and the latter provide the pollution mitigation rate in the watershed up to 6 and 8% for BOD5, respectively. The methodology proposed here for TMDL management can be applied to a wide range of watersheds in Korea.

Determination of target water quality indicators and values on total maximum daily loads management system in Korea

2009 ◽  
Vol 6 (1-3) ◽  
pp. 12-17 ◽  
Author(s):  
Bae Kyung Park ◽  
Jae Hong Park ◽  
Seung Young Oh ◽  
Dong Soo Kong ◽  
Doug Hee Rhew ◽  
...  
Keyword(s):  
Water Quality ◽  
Quality Indicators ◽  
Management System ◽  
Water Quality Indicators ◽  
Total Maximum Daily Loads ◽  
Maximum Daily Loads ◽  
Total Maximum

scholarly journals Total maximum daily loads of beton reservoir, Gunungkidul Regency, Indonesia during the rainy season

2020 ◽  
Vol 200 ◽  
pp. 01006
Author(s):  
Febby Firizqi ◽  
Margaretha Widyastuti
Keyword(s):  
Water Quality ◽  
Rainy Season ◽  
Water Discharge ◽  
Total Maximum Daily Load ◽  
Water Quality Standards ◽  
Hydrological Characteristics ◽  
Maximum Daily Loads ◽  
Total Maximum ◽  
Daily Load ◽  
Special Region

A total maximum daily load (TMDL) is an integrated mechanism to maintain water body to meet the water quality standards of its designated uses. This research was intended to determine the TMDL of Beton Reservoir, a structure built to regulate the water discharge of Beton karst spring in Gunungkidul, Indonesia, especially during the rainy season. The TMDL calculation referred to the Regulation of the Minister of State for Environment No. 28 of 2009 on TMDLs of Lakes and/or Reservoirs that required a calculation of morphological and hydrological characteristics, and water quality to meet Class II standard issued in the Regulation of the Governor of the Special Region of Yogyakarta No. 20 of 2008. The results showed that Beton Reservoir had a total volume of 22 586.83 m3, a surface area of 18 673.12 m2, and a depth of averagely 1.21 m and released water at a rate of 0.48 m3 s–1. From the perspective of quality, the TSS and DO of its water had exceeded the standards, whereas the other parameters: temperature, TDS, pH, BOD, COD, total PO4, and NO3 were within their allowable presence in the water. Based on TMDLs for TSS, DO, BOD, COD, total PO4, and NO3, the Beton Reservoir can no longer accommodate TSS and NO3 while continuing to meet the standards for these pollutants. High levels of TSS and NO3 are attributable to the agricultural activities taking place on the catchment and the flow concentration typical of karst regions.

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