Finding Sources of Inflow and Infiltration
Involves pumping smoke through sewers from manholes in streets and observing where smoke exits. The exiting smoke can indicate a broken pipe or identify where roof or foundation drains are improperly connected to the sewer system.
Cameras can be robotically sent down sanitary sewer lines and along each side sewer to record a video of sewer conditions. Inspections can identify breaks, root intrusion, leaking water and deteriorating conditions.
Involves pouring non-toxic fluorescent colored dye down roof drains or catch basins to see if that dye makes its way into the sewer. This provides verification that the storm drainage being tested is directly connected to the sewer.