Central Park Parking Lot Bioswale System

Huntington Beach, CA


PACE was hired by the City of Huntington Beach to design improvements to an existing parking lot, including a low-impact development (LID) Best Management Practice (BMP) to manage parking lot runoff. PACE prepared conceptual, preliminary, and final design and planting plans for the parking lot. A bioswale collects and treats parking lot runoff before the runoff is discharged to the storm drain system. Prior to this project, the lot was a standard parking lot with a raised island that offered no stormwater treatment or detention and was in poor condition. The new parking lot design allows runoff to flow to an attractive vegetated bioswale that serves as both stormwater conveyance and treatment. As water slowly seeps into the soil of the bioswale, soil microbes, plant roots, and the slow movement of water through the soil all remove pollutants from the stormwater. Treated stormwater either seeps into the soil below the swale, where it helps replenish groundwater, or flows to the downstream end of the swale, located adjacent to Slater Avenue.


Key Features:

  • Bioswale system
  • Water quality treatment
  • LID application
  • Improvement plan preparation
  • Regulatory permitting

City of Huntington Beach

Stormwater Management / Flood Control, Stormwater Quality