Marshalltown, IA

Peak Holding and Pumping Improvements

  • Client City of Marshalltown
  • Type Wastewater
  • Services Evaluation, Design, Construction
  • Construction Cost $5.7 Million
  • Project Manager Lance Aldrich, P.E., BCEE
  • Project Engineer Winnie Gleason, P.E.

CHALLENGE

The existing flow equalization basin and pumping system were inadequate to handle peak flows during major storm events.

Archimedes screw pumps arrive on site

Archimedes screw pumps arrive on site

Supra

West EQ Basin Return Structure

2b Screw Pump Station - Motors set, steps on, setting the grates on top

Screw Pump Station – Motors set, steps on, setting the grates on top

SOLUTION

FOX Engineering worked with Marshalltown to negotiate improvements with IDNR that would be required to address this issue. Ultimately, the project utilized a new 30 MGD capacity Archimedes Screw style pump station to transport excess flow to flow holding and additional equalization capacity.

The project included a new sludge storage tank and mixers, two raw wastewater pumps, new grit dump, new electric building and standby generator, and two new public works buildings for storage of large equipment.

Screw pump station

Screw pump station

3a Screw pumps

Screw pumps

OUTCOME

With the new pump station and an additional 21 million gallons of flow equalization, the Marshalltown facility is designed to handle storm flows of at least a 10-year storm event. Construction was complete in 2013.

Setting the Screw Pumps

Setting the Screw Pumps

5. West EQ Basin West Overflow Structure - gate attached

West EQ Basin West Overflow Structure – gate attached

Flow EQ Basin

Flow EQ Basin

 Flow EQ

Flow EQ