Client:
Rock Rapids Municipal Utilities

Rock Rapids, IA

Key Features:

  • Repair of leaking underdrain
  • Installation of new 30-year interior coating
  • Installation of corrosion proof stainless steel underdrains.
  • Recoat filter exterior
  • Convert from water only to air and water backwash
  • Cathodic protection

Key Experience:

  • Economical rehabilitation of existing gravity sand filters
  • Installation of extended life coating systems
  • Staging rehabilitation to maintain service during the project

Gravity Filter Rehabilitation

Rock Rapids Municipal Utilities operated a 35-year old gravity sand filter that had been repaired and recoated multiple times in the past.  DGR Engineering evaluated replacement of the filters and construction of a new water treatment plant.  However, rehabilitation of the existing filters was significantly more economical.

Work included: removal and replacement of existing filter wash troughs, media and underdrain and installation of new air wash blower system.  Recoating  of interior and exterior of filter, catwalk and process piping and miscellaneous appurtenant work.  Interior coating consisting of a 30 mil polyurethane high strength coating system.

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DGR performed the boundary and topographic surveying as well as the site design of school building addition as a subconsultant.

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