Repr. from: Proceedings / Distribution System Symposium, Portland, Oregon, September 9-12, 1990 ; sponsored by AWWA Distribution Division. -- Denver, CO : American Water Works Association, c1990.
Distributed to depository libraries in microfiche.
"EPA/600/A-92/137"--1st prelim. p.
Header title: Distribution System Symposium proceedings.
Includes bibliographical references (pages 357-358).
Microfiche. [Washington, D.C.?] : Supt. of Docs., U.S. G.P.O., [1992] 1 microfiche : negative.