Investigation to Identify Excessive Water
In July of 1998 the Village of Menomonee Falls engaged Ruekert & Mielke, Inc. to conduct an investigation of the Village Sanitary Sewerage System. The investigation identified sources of excessive clear water infiltration and inflow and recommended corrective measures to abate infiltration and inflow.
The investigation phase of the clear water infiltration and inflow reduction plan included an extensive sanitary sewer manhole inspection program.
The inspectors recorded the date and time of the inspection, name of the inspectors, the type of surface surrounding the manhole (turf, asphalt or concrete), and the condition of the surface.
The condition of each component of the manhole is recorded - including the condition of the cover, frame, chimney, cone and barrel, the number of pick and vent holes, and the condition and type of gasket seal. Any noticeable defects caused by deterioration due to age or ground movement and evidence of surface pounding or flooding over the manhole cover.
Manholes are inspected during routine jetting and televising operations. Defects are recorded and repaired
All new construction sewer lines are TV inspected to map the lines, verify as-built drawings and ensure the lines have no construction flaws. This inspection process must be completed prior to accepting the line for maintenance. Additionally, all manholes are vacuum tested to ensure no infiltration.
Wet Weather Conditions
During wet weather conditions, the flows are reviewed daily, if the average daily flow is high at a lift station or metering manhole, a crew is sent out to pull manhole covers to inspect manhole conditions and observe flow in the line. We televise and document any leaks in sewer lines.