Control Measures

Hacienda Avenue street and bioretention

Control Measures

  • LID reduces runoff and mimics a site’s natural (predevelopment) hydrology by minimizing disturbed areas and impervious surfaces and retaining and treating stormwater runoff using infiltration, biotreatment, evapotranspiration, and rainwater harvesting and reuse. Private and public new and redevelopment projects that create or replace 10,000 square feet or more of impervious surface are required to include LID.
  • GSI Plans adopted by the Cities/Town will gradually shift impervious surfaces and storm drain infrastructure from gray (traditional storm drain infrastructure where runoff flows directly into the storm drain), to green—a more-resilient, sustainable system that slows runoff by dispersing it to vegetated areas, promotes infiltration, and uses bioretention and other green infrastructure practices to clean stormwater runoff. The GSI Plan guides the identification, implementation, tracking, and reporting of green stormwater infrastructure projects within the municipality. GSI Plans: Campbell, Los Gatos, Monte Sereno, and Saratoga
  • Site Design Measures are site planning techniques that can help reduce the impacts of increased runoff and pollution from land development on water quality. Examples include preserving existing vegetation, reducing impervious surfaces, directing runoff to vegetated areas, using pervious pavement, and directing roof downspouts to landscaped areas.
  • Source Control Measures prevent exposure of potential pollutant sources to stormwater to prevent polluted runoff. Examples include covered trash enclosures, covered outdoor materials handling and storage areas, sanitary sewer drains for vehicle wash areas (with sewer agency approval), and storm drain stenciling.
  • Stormwater Treatment Facility inspections ensures property owners are maintaining Stormwater Treatment Facilities, such as Bioretention Basins, Tree Well Filters, Pervious Pavement, etc. Municipalities must inspect at least 20% of installed stormwater facilities yearly and all facilities within five years.

  • Additional resources include: