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CHAPTER17 Methods for Estimating Inflow and Infiltration ...

CHAPTER17 Methods for Estimating Inflow and Infiltration into Sanitary Sewers David Crawford, Paul Eckley and Edwin Pier Excessive Inflow and Infiltration during wet weather periods into capacity-constrained sewer systems cause sanitary sewer overflows (SSOs). The two major components of wet weather flow are Inflow and Infiltration , and arc the main factors found in sanitary sewer evaluation studies (SSES) or Inflow / Infiltration (III) studies. Control and reduction of Inflow and Infiltration directly relates to effective controls for SSOs. The interaction and relative proportions of Inflow and Infiltration determine the extent, effectiveness and cost of control measures. Usually, control of direct Inflow is the first source pursued, with the Infiltration component either lumped into part of the Inflow as an immediate response, or neglected because of the dominance of peak flow rates induced by Inflow .

304 Estimating Inflow and Infiltration into Sanitary Sewers hydrograph for that point in the system. The total hydrograph is the sum of the wet weather hydrograph, the usually assumed constant ground water flow and the

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