Inflow and infiltration (I & I) surveys allow for the evaluation and assessment of large areas of sewer networks in a short period of time. I & I surveys require the installation of flow monitoring devices at key locations throughout the network to measure flow and depth levels, usually at 5 minute intervals. Once the discharge information is gathered, usually over a number of weeks, the operator is able to determine the extent of inflow (illegal connections etc.) and infiltration (leakages via groundwater etc.) via a hydraulic model of the system. Decisions can then be made about the general capacity and condition of the network and an assessment made of the amount of rehabilitation that may need to take place. I & I studies can direct investment to areas of most need. By undertaking an I & I study before and after rehabilitation the effectiveness of the rehabilitation can be determined.


TRUE VALUE OF I & I SURVEYS

• Save Money • Alleviate flooding and surcharge by rehabilitating pipes most in need of repair • Knowing exactly how much flow is in your sewer network • Plan for the future with a knowledge base of your network

Flow data for over a 60 day period

Flow data for 24 hour period