Background:
This combined program addresses many of the manholes of the sanitary collection system that are structurally deficient and allow for inflow and infiltration. In addition, the program rehabilitates existing sanitary sewers through the use of cured-in-place pipe (CIPP) liners. The CIPP product has been proven to eliminate leaking joints, restore structural integrity to damaged sewers and provide increased flow capacity without the cost of open excavation.
The rehabilitation of the manholes and sanitary sewer pipes is needed to comply with the Iowa Department of Natural Resources (IDNR) Administrative Consent Order.
This program is a combined effort by the Sewer and Engineering Divisions of the Public Works Department. The manhole and sanitary sewer pipe rehabilitation areas were based on inflow and infiltration studies and inspections by City Staff.
Funds for the Fiscal Year 2021/2022 Manhole Rehabilitation/Replacement & CIPP Lining Program are budgeted in CIP Project #30050 funded at $2,500,000 in bonds abated by sewer funds.