Geomorphic approach vital to design of pipelines crossing mountain streams

12/06/2004
Flood discharge and stream scour studies at pipeline mountain stream crossings alone cannot adequately protect a pipeline where other, more-hazardous processes are possible.Studies have shown that scour, impact, and aggradation associated with debris flows, outburst floods, or related phenomena may fundamentally change the parameters needed for proper pipeline crossing design. Depending on the process type, the peak discharge of the hazardous process can exceed that of the design flood (typically 50-200 year return period) by factors of 2 to 50.Similarly, scour or aggradation by a nonfluvial process can exceed the hydrologically derived estimates by several factors. A geomorphic approach,...
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