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To: paul61 who wrote (81772)	10/20/2011 12:30:11 PM
From: elmatador	Respond to of 218065

Pipes are made of HDPE. Service Life Control and disposal of surface water runoff during periods of abnormally high rainfall with associated floods require efficient and reliable systems of drainage of predictable longevity. Estimates of years of reliable low maintenance service, anticipated in the design phase, is dependent upon service experiences, choice of pipe materials, environmental considerations, regional construction practices and economic constraints. The desired service life of a drainage system is specified by the agency of jurisdiction. A 50-year design life is generally the minimum specified; therefore a service life in excess of that brings further economies to the installation. The service life of corrugated HDPE pipe manufactured from today’s materials is expected to exceed 100 years. Well-defined and timely maintenance is key to achieving the anticipated longevity. Inspection strategies vary. Rehabilitation or replacement is justified when it is unsafe, or uneconomical, to maintain elements of the drainage system in service. Trenchless methods of rehabilitating metal and concrete include slip lining, flexible tube lining and Portland cement mortar lining. The use of preformed linings of plastic are often followed with grouting of the annular space between the liner and the existing pipe.