City of Manhattan Beach Pump Station Upgrades

Manhattan Beach, CA


The City of Manhattan Beach needed to increase potable water delivery capacity and reliability for the Hill Area Pressure Zone (HAPZ) for potable and fire flow needs. The area is serviced by the Larsson Street Booster Pump Station and has additional backup pumping capabilities from the 2nd Street Booster Pump Station. PACE was hired to evaluate the condition of the pumping facilities, determine the flow capacity of the associated delivery lines, design a capacity expansion for the Larsson station to increase capacity from 1,500 gallons per minute (gpm) to 4,400 gpm, and determine the feasibility of upgrading, replacing, or leaving the 2nd Street station in place with no modifications.


For the Larsson station, PACE proposed the design of four pumps with vertically mounted, end-suction pumping equipment and modern motor controllers to increase the delivery capacity to 4,400 gpm while maintaining the minimal footprint within the existing vault. To create the best visualization of the complete installation, PACE developed a three-dimensional model of the design to demonstrate that the vault had adequate space for the new pumps. An extensive flow study of the HAPZ determined that the existing pipe network was adequately sized to meet required fire and domestic demands, therefore saving the City significant money and time by eliminating design and replacement of water mains.


A preliminary assessment of the 2nd Street station concluded that a new pump station was necessary to resolve vibration and maintenance issues, improve reliability, and modernize the aging equipment. Design improvements included new engine-driven pump equipment to resolve vibration and maintenance issues, a larger vault, a new jockey pump system for low-flow operation so the facility could operate as the main water pump station while the Larsson station upgrades were under construction.


Key Features:

  • Pump station upgrade and capacity expansion from 1,500 gpm to 4,400 gpm
  • End-suction pumping equipment
  • Modernized motor controls
  • Pipeline flow capacity study
  • Construction sequencing to minimize operations impacts
  • Backup power supply assessment and upgrades



City of Manhattan Beach

Water Infrastructure