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Development Of A Water Quality Model To Support Newport Bay California Tmdl

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Development Of A Water Quality Model To Support Newport Bay California Tmdl

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Author : J. F. DeGeorge
language : en
Publisher: IWA Publishing
Release Date : 2003-02-01

Development Of A Water Quality Model To Support Newport Bay California Tmdl written by J. F. DeGeorge and has been published by IWA Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-02-01 with Science categories.

Newport Bay (Orange County, California) is listed by the California State Water Resources Control Board (SWRCB) as a water quality limited receiving water body because of sporadic exceedances of the fecal coliform water quality objectives for body contact recreation. Consistent with federal and state requirements, a Total Maximum Daily Load (TMDL) is being implemented in the watershed. The fecal coliform TMDL in Newport Bay is a phased approach for understanding and controlling the microbiological water quality in the to ensure the reasonable protection of the Bay?s beneficial uses. An important initial step within that TMDL was to assess the impairment of the body contact recreation beneficial use (REC-1) of Newport Bay receiving waters through characterizing the risk of illness associated with REC-1 exposure. A health risk assessment investigation was developed to characterize that risk. The health risk assessment investigation involved the integration of a population based model of disease transmission, a water quality modeling component necessary for estimating pathogen dose as part of the exposure assessment, and site-specific population use and receiving water data collection. The Water Environment Research Foundation funded the water quality modeling component of the health risk assessment investigation, which is the focus of this report. Also provided within this report is an overview of the health risk assessment methodology, a summary of the major findings from the risk assessment investigation, and a discussion of how the health risk methodology may be applied to other watersheds where impairment of the REC-1 beneficial use is in question. The major findings of the health risk assessment investigation indicated that (1) the risk of illness from REC-1 use in Newport Bay, estimated using two separate methods was generally below levels considered tolerable by US EPA, and (2) the reduction of controllable sources of pollution would not appreciably reduce the existing risk. Based on the collection of site-specific exposure data and the health risk characterization, it was determined that evaluating the impairment of the REC-1 beneficial use requires a more rigorous and comprehensive health based approach than that prescribed by the current regulations for recreational waters.

Development Of A Water Quality Model To Support A Pathogen Tmdl Newport Bay California

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Author : John F. DeGeorge
language : en
Publisher:
Release Date : 2002-01-01

Development Of A Water Quality Model To Support A Pathogen Tmdl Newport Bay California written by John F. DeGeorge and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-01-01 with Water categories.

Tmdls

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Author : Jennifer Ruffolo
language : en
Publisher: DIANE Publishing
Release Date : 1999

Tmdls written by Jennifer Ruffolo and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Water categories.

TMDLs (Total Maximum Daily Loading) define how much of a pollutant a water body can tolerate on a daily basis & still meet the relevant water quality standards. All of the sources of the pollutant in the watershed combined, including non-point sources, are limited to discharging no more than that total limit. EPA is suing states to force them to produce TMDLs. A growing number of California's water bodies are either subject to consent decrees to develop TMDLs, or are the subject of notices of intent to file lawsuits that may have that outcome. This report addresses California's many problems in establishing TMDLs for its impaired water bodies.

Stochastic Modeling And Uncertainty Assessment For Watershed Water Quality Management

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Author : Yi Zheng
language : en
Publisher:
Release Date : 2007

Stochastic Modeling And Uncertainty Assessment For Watershed Water Quality Management written by Yi Zheng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

Complex watershed water quality models have been increasingly used to support Total Maximum Daily Load (TMDL) development. However, systematic approaches for addressing the significant simulation uncertainty are lacking. For TMDLs supported by complex watershed models, defining the margin of safety (MOS) component through a rigorous uncertainty analysis remains a significant challenge. This study aimed to develop (1) a systematic approach of uncertainty analysis for complex watershed water quality models in the watershed management context; and (2) a framework for defining the MOS with an explicit consideration of uncertainty and degree of protection. A global sensitivity analysis technique was first applied to select critical model parameters. A framework for sources of uncertainty and their interactions was built. Based on this framework, Generalized Likelihood Uncertainty Estimation (GLUE) was initially evaluated as a potential approach for conducting stochastic simulation and uncertainty analysis for complex watershed models. The limitations of GLUE became evident, which led to the development of a new Bayesian approach, Management Objectives Constrained Analysis of Uncertainty (MOCAU). The concept Compliance of Confidence (CC) was then introduced to bridge the gap between modeling uncertainty and MOS. An optimization model was also developed for cost-minimized TMDLs. This study used WARMF as an example of a complex watershed model and constructed a synthetic watershed for developing and testing methodologies. The methodologies were also implemented to study the diazinon TMDL in the Newport Bay watershed (southern California). This research contributes to the theory of stochastic watershed water quality modeling, as well as to the practices of managing watershed water quality.

Guidance For Water Quality Based Decisions

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Author :
language : en
Publisher:
Release Date : 1991

Guidance For Water Quality Based Decisions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Water categories.

Water Quality Modeling For Wasteload Allocations And Tmdls

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Author : Wu-Seng Lung
language : en
Publisher: John Wiley & Sons
Release Date : 2001-04-30

Water Quality Modeling For Wasteload Allocations And Tmdls written by Wu-Seng Lung and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-04-30 with Technology & Engineering categories.

Complete, practical coverage of pollution control regulations and water quality modeling Water Quality Modeling for Wasteload Allocations and TMDLs provides practical guidance for engineers charged with determining the volume and character of wastewater that a body of water can receive without suffering environmental damage. Following the discussion on water pollution control regulations and their relationships to water quality modeling and wasteload allocation for determining the total maximum daily load (TMDL), the first half of the book focuses on quantifying the model coefficients to characterize physical, chemical, and biological processes of a variety of water quality problems. The remainder of the book guides engineers in the application of EPA-developed models for regulatory use. Presenting numerous case studies and a substantial amount of data, this comprehensive guide: * Covers practical applications of wasteload allocation * Provides guidance to develop technical information for obtaining National Pollution Discharge Elimination System (NPDES) permits * Demonstrates the application of STREAM, QUAL2E, WASP, and HAR03 Water Quality Modeling for Wasteload Allocations and TMDLs is an essential resource for state and federal water quality agencies, consulting engineering firms, publicly owned treatment works, environmental biologists and chemists, and public health officials involved with pollution control.