AWWA JAW59702

Pipes in distribution systems often become tubercolated,which can lead to an increase in the roughnessof the pipe wall and in a reduction of the pipe diameter.Many model calibrations allow for adjusting theroughness coefficients alone, often neglecting the reductionin pipe diameter. Such oversights can have a significanteffect on the prediction of correct flow velocity.This article explores the relationship betweenpipe roughness and effective pipe diameter. On thebasis of a series of fieldwork measurements and amodeling study, the authors make several conclusions,including: calibrating models usingchanges in pipe wall roughness to describe measuredpressure data may be insufficient to accuratelymodel the performance of the system; and, ignoringthe reduced effective diameter of the pipecan lead to incorrect predictions of hydrauliccapacity. Includes 11 references, figures.

Product Details

Edition:

Vol. 96 - No. 4

Published:

04/01/2004

Number of Pages:

9

File Size:

1 file , 4.5 MB