Nystrom, Lynn A.2015-10-292015-10-292010-06-07http://hdl.handle.net/10919/63199More than 2 million miles of the nation's infrastructure of water and wastewater pipes is nearing the end of its useful life, but the mostly underground facilities often do not attract much attention because of this "invisibility," said Sunil Sinha, Virginia Tech associate professor of civil and environmental engineering.In CopyrightCollege of EngineeringPress releaseVirginia Tech. University Relations