Flow and rainfall monitoring

Flow monitoring establishes a direct correlation between each Local Agency's wastewater flows and the effect of rainfall on infiltration and inflow entering the system. The effects are measured and compared downstream to evaluate King County wastewater system alternatives and associated cost saving possibilities.

Open channel flow monitors were used to gather sewer hydraulic information and were installed in manhole locations throughout the County during the winters of 2000/2001 and 2001/2002.

Rainfall monitoring is the measurement and reporting of rainfall quantities to provide a credible basis for the Local Agency flow data identified by the Regional I/I Control Program. Seventy three rain gauges located throughout King and Snohomish County collected rain gauge data to generate accurate rainfall quantities in the I/I Control Program study area.