2005 BES Annual Meeting Presentation and Poster Abstracts
A tale of two flowpaths: stream-sanitary line exchange in an urban watershed
C. Shields, M. Lipscomb, K. Belt, L. Band
Abstract: Streams and sanitary lines run parallel through many urban valleys and perform a similar hydrologicfunction: exporting water from a catchment. Inflow and infiltration (I/I) refers to the movement of stormflow and groundwater into sanitary sewers. As groundwater elevation increases, greater infiltration occurs. However, under extreme flow conditions, sanitary lines may surcharge (figure 1) into the environment and treatment plants may be overloaded. Flow into and out of sanitary lines is a function of the hydraulic gradient between pipe and external environment, and the pipe "Leakiness". This depends on pipe flow volume and adjacent groundwater levels. We aim to evaluate when, where, and in which direction fluids are exchanged between the ecosystem and sanitary sewer system in urban watersheds.