In recent years, the water supply industry and general public have become increasingly interested
in the quality of water in distribution systems. Correspondingly, the U.S. Environmental
Protection Agency (USEPA) has been developing standards that focus attention on the quality of the
water at the customer's tap, in addition to their historical standards that emphasize the quality of
water 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 distribution
system.
This paper discusses guidance related to Stage 2 Initial Distribution System Evaluation
(IDSE) compliance, and use of distribution system modeling for overall water quality
management and assistance with regulatory compliance. The paper discusses the
methodology and theory behind developing a sophisticated system model, and includes
discussion of two recent projects in which this type of model was used for the utilities' IDSE
report and subsequently for system operational adjustments.
The Charleston Water System, South Carolina, and Town of Cary, North Carolina, both found
value in using their previous investment in developing a hydraulic models, which were refined
using intensive time-of-travel calibration to exceed the requirements of the IDSE. The models
can be subsequently used to implement system operating protocols to refine water quality. These
operating practices include system tank fill/drain operations, efficiency of system pumping
operations, flushing programs, emergency response, and response to other system water quality
issues. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 3.3 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 45 |
| Published : | 06/01/2007 |
