RDIIRainfall-Derived Infiltration and Inflow (environmental statistic; Japan Institute of Wastewater Engineering Technology)
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This would eliminate RDII and mean that they would not exceed their contract amount of sanitary sewage flow into the WWTP.
Our target was to eliminate 75 percent of the RDII and we made it.
That will determine how much of the cost of the tunnel project they will have to pay, but it will also determine, for the first time, how much RDII can be eliminated when a city reconstructs all of its sewer system except the service laterals.