Stormwater Quality Design Manual (May 2007) - City of Sacramento ...

Runoff Reduction Control Measure Fact SheetInterceptor TreesDescriptionInterceptor trees are those used in residential andcommercial settings as part of the stormwaterquality management plan to reduce runoff andpollution from the development project.Interceptor trees can be placed on residential lots,throughout landscape corridors, in commercialparking lots, and along street frontages. Treesinstalled in municipal right-of-ways may beprotected through ordinances and can provideyears of aesthetic benefit.Siting Considerations• Soils: Drainage and soil type must support selected tree species.• Location: Locate within 25 feet of impervious surface.• Other structures: Maintain appropriate distance from infrastructure and structures that could bedamaged by roots and avoid overhead power lines, underground utilities, septic systems,sidewalks, curbs, patios, etc.Vector Considerations• Potential for mosquitoes due to standing water where excess irrigation is applied or planter box isnot designed to properly drain.Advantages• Reduces the amount of pollutants entering the storm drain system.• Can reduce size of downstream stormwater quality treatment measure(s) by reducing the volumerequired to treat.• Enhances aesthetic values.• Provides shade to cool pavement and reduces surface runoff temperatures.• Aids in removal of air pollutants and noise reduction.• Shade trees required by the permitting agency may be counted as interceptor trees.• Extends life of asphalt paving.Limitations• Fire safety may be a consideration in areas with increased risk for fire hazard.Maintenance Recommendations (Low 1 )• Pruning of trees may be required to maintain tree, ensure safety, and prevent damage tostructures.• Diseased/damaged tree, and those with poor structure should be removed and replaced as soon aspossible.• Irrigation system may be required in perpetuity.1 Compared to stormwater quality treatment control measures discussed in Chapter 6.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007INT-1