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Redwood City Sanitary Sewer Master Plan Table of Contents <br /> FINAL <br /> <br />August 2008 vi <br />Abbreviations and Definitions (cont.) <br /> <br />SMD Sewer Maintenance District (county) <br />SSMP Sewer System Management Plan <br />Surcharge The hydraulic condition in a sewer pipeline in which the elevation of the hydraulic <br />gradeline (water level) is above the crown (top) of the pipe. Under such a condition, <br />the water in the pipe rises into the manholes and could overflow onto the ground if <br />the hydraulic gradeline exceeds the elevation of the manhole rims. <br />V&A V&A Consulting Engineers, Inc. <br />WWF Wet weather flow: the flow during rainfall periods, composed on base wastewater <br />flow, wet season groundwater infiltration, and rainfall-dependent I/I. <br /> <br /> <br />6.2.A. - Page 216