Jones Falls Wastewater Pumping Station Rehabilitation

Location: Baltimore, MD

Client: City of Baltimore, Maryland

Jones Falls Wastewater Pumping StationJones Falls Wastewater Pumping StationJones Falls Wastewater Pumping StationJones Falls Wastewater Pumping StationJones Falls Wastewater Pumping StationCCJM was the prime consultant for the rehabilitation of the 36 mgd Jones Falls Pumping Station. This station was initially constructed in 1948 and was partially renovated in 1970 and again in 1980.

The existing pumps, motors, and controls were approaching the end of their useful life. More importantly, the pump station had lost most of its automatic controls and maintenance of the pumps had become increasingly difficult. The project was completed in three phases and the major tasks in the design included:

  • Replacement of the vertical 600 HP pumps and motors with horizontal pumps and new controls
  • Replacement of the existing “flow matcher” pump control system with new variable frequency drive motors
  • The single wet well was divided into three sections
  • Upgrade of the secondary power system
  • Evaluation of the reliability of the primary power supply
  • Replacement of the screens with finer screens
  • Protection of the station from flooding to the 100 year flood level
  • Replacement of the HVAC ventilation system to meet the NFPA code
  • Development of a pump bypass scheme

Planning Phase

CCJM completed this phase in six weeks. Work included an assessment of existing conditions, preparation of record base drawings for each floor, and development and calibration of pump system performance curves. The minimum flow at the station was about 8 MGD; therefore, planning for the pump controls and power changeovers was critical

Design Phase

The CCJM Team developed mechanical, structural, civil and control strategies including P&IDs for the improvements. Design challenges included changing the vertical pumps to horizontal pumps and relocating all electrical equipment above the 100 year flood elevation. Flood proofing options were limited since the station was not originally designed to withstand the water levels of a 100 year flood. CCJM prepared Bid Ready Drawings, specifications and construction cost estimates.

Construction Phase

CCJM reviewed shop drawings, answered Requests For Information, provided periodic inspection assistance, developed Operation & Maintenance Manuals, and conducted operations training. Construction began in 1999, and was completed in 2001.