Linear Filters

Linear filters are treatment devices that can be constructed and operated in areas with narrow space constraints or poor soil conditions, which would limit the implementation of other, conventional BMPs. Linear filters consist of a sedimentation chamber with a permanent pool of water and a filter chamber with an underdrain. The key treatment processes include filtration and sedimentation. The primary constituents removed include total suspended solids (TSS), total phosphorus, total and dissolved metals, microbiological constituents, and litter.

Caltrans Linear Filtration Trenches Pilot Study
Many conventional treatment BMPs are difficult to implement along Caltrans highways due to narrow space constraints and right-of-way limitations, or poor soil conditions that prevent implementation of linear infiltration BMPs. To address these considerations, Caltrans identified and designed four types of linear filtration devices for further evaluation. The overall objective of this pilot study was to investigate the effectiveness and feasibility of using linear filtration systems to treat both piped and sheet flow runoff from Caltrans highways.

OWP Tasks
  • Assisted in Study Planning
OWP Contacts: Dipen Patel