Sanitary Sewer System Evaluation and Design, Phases 1 and 2

Sanitary Sewer System Evaluation and Design, Phases 1 and 2


The City of Ames identified over $25 million of sanitary sewer collection system repairs. WHKS assisted the City to complete the Sanitary Sewer System Evaluation (SSSE) and Design Phase 1 and 2 projects. A State Revolving Fund loan partially financed the initiative.

Phase 1 work tasks included system risk analysis, repair prioritization, manhole rehabilitation plan review (for areas 1-5), and analysis, design, and preparation of plans and specifications for rehabilitation of flood prone manholes. The project also included a structural and hydraulic evaluation of all siphons within the City including the East Lincoln Way and East Nikkol siphon structures.

Phase 2 completed high priority sanitary sewer collection system repairs necessary to eliminate sources of infiltration and inflow, provide adequate flow capacity, and extend the life of the existing infrastructure in Ames. Work tasks included system repair prioritization, design and preparation of plans for CIPP lining.

WHKS assisted with the public outreach effort, which included meetings with City staff and public information meetings with residents.

WHKS also provided assistance to the City for Iowa DNR permitting, environmental review, and other information related to the project’s SRF financing. WHKS provided construction observation and administration services for these improvements.


  • Sanitary sewer system analysis
  • Field inspections
  • Collection system repair design
  • Trunkline capacity improvements and rehabilitation (conceptual and design)
  • Public involvement
  • Construction observation and administration services