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→Planning
*[[pretreatment| pre-treatment devices]] to retain coarse sediment, trash, debris and floatables,
*[[pretreatment| pre-treatment devices]] to retain coarse sediment, trash, debris and floatables,
*perforated [[pipes]] embedded in washed gravel connected to maintenance holes and catch basins,
*perforated [[pipes]] embedded in washed gravel connected to maintenance holes and catch basins,
*a gently sloping granular [[reservoir aggregate| storage reservoir]] below the perforated pipe that may include trench plugs.
*a gently sloping granular [[reservoir aggregate| storage reservoir]] below the perforated pipe.
'''Optional components include:'''
'''Optional components include:'''
*[[Geotextile]] to prevent migration of fines into the reservoir;
*[[Geotextile]] to prevent migration of fines into the reservoir;
*Trench plugs to help disperse stormwater throughout the trench and enhance infiltration; and
*Perforated maintenance hole or catch basin risers.
*Perforated maintenance hole or catch basin risers.
If properly located, designed and maintained, perforated pipe systems can greatly reduce runoff volume while having little or no surface footprint, which helps to conserve highly valued developable land.
If properly located, designed and maintained, perforated pipe systems can greatly reduce runoff volume while having little or no surface footprint, which helps to conserve highly valued developable land.
Systems should be located below shoulders of roadways, [[permeable paving]] or [[swales]] where they can be readily excavated for servicing. An adequate subsurface area outside of the 4 m setback from building foundations and suitable distance from other underground utilities must be available.
Systems should be located below shoulders of roadways, [[permeable pavements]] or [[swales]] where they can be readily excavated for servicing. An adequate subsurface area outside of the 4 m setback from building foundations and suitable distance from other underground utilities must be available.
===Site Topography===
===Site Topography===