Full Description

In recent years, the water supply industry and general public have become increasingly interestedin the quality of water in distribution systems. Correspondingly, the U.S. EnvironmentalProtection Agency (USEPA) has been developing standards that focus attention on the quality of thewater at the customer's tap, in addition to their historical standards that emphasize the quality ofwater leaving water treatment plants. In particular, the Stage 2 Disinfection Byproducts Rule(DBPR) will require water purveyors to focus on water quality at all points in the distributionsystem.This paper discusses guidance related to Stage 2 Initial Distribution System Evaluation(IDSE) compliance, and use of distribution system modeling for overall water qualitymanagement and assistance with regulatory compliance. The paper discusses themethodology and theory behind developing a sophisticated system model, and includesdiscussion of two recent projects in which this type of model was used for the utilities' IDSEreport and subsequently for system operational adjustments.The Charleston Water System, South Carolina, and Town of Cary, North Carolina, both foundvalue in using their previous investment in developing a hydraulic models, which were refinedusing intensive time-of-travel calibration to exceed the requirements of the IDSE. The modelscan be subsequently used to implement system operating protocols to refine water quality. Theseoperating practices include system tank fill/drain operations, efficiency of system pumpingoperations, flushing programs, emergency response, and response to other system water qualityissues. Includes tables, figures.

Product Details

Edition: Vol. - No. Published: 06/01/2007 Number of Pages: 45File Size: 1 file , 3.3 MB