Infiltration(1) Penetration of freshwater or groundwater into the sewer system through cracks, defective joints in the pipeline, and holes, or through lateral connections, manholes or inspection chambers. (2) All extraneous waters (storm water and ground water) which enter the wastewater collection system through various sources including, among others, pipe defects, defective service connections, manhole covers, roof leaders, and foundation drains./Inflow; this is the sum of all the extraneous contributions to the collection system.
Internal Condition GradeThe elevations shown on plans and/or survey grade stakes for the installation of the carrier pipe. It is occasionally to give elevations for casing. In most cases, it is given to the flow line but can also be given to the top of the pipe or casing.; numeric criteria applied to visual images of sewers to develop a priority rating based on defects observed.
Lost time when the MTBM is not in operation; not including make-up time or downtime.
Information Guidance Notes; an international reference source for some lining materials.
Temperature at which the vapors emitted from a material will ignite either without exposure to a flame (self-ignition) or when a flame is introduced (flash ignition).
