Patent ID: 8447533
Filing Date: 2013-05-21
Classification: E03F

Abstract:
1. A method of reducing rainwater or ground water inflow or infiltration into a wastewater collection grid comprising the steps of (a) identifying a wastewater collection grid having a configuration comprising a plurality of manholes; (b) dividing said wastewater collection grid into a plurality of major subsystems, said configuration of said wastewater collection grid being such that each of said major subsystems has one of said manholes at an outlet end thereof; (c) installing flow depth level detectors in said manholes at said outlets ends of said major subsystems; (d) using said flow depth level detectors to determine for each of said major subsystems a ratio (ΔQ) of wet weather volume flow rate to dry weather volume flow rate by: (e) using said ΔQ ratios for said major subsystems to at least identify a highest ranking one of said major subsystems which ranks highest in contributing to said wastewater collection grid a greater volume amount or a greater cost amount of said rainwater or ground water; and (f) locating for repair or improvement one or more points of ground water or rainwater flow or infiltration in said highest ranking one of said major subsystems.