Media filters

For gravel filter ideas which use the filtering of geotextile, see infiltration trenches.

	Surface filter	Underground filter	Perimeter filter	Pocket filter	Organic filter	Bioretention
Minimum head (m)	1.5	1.2	0.9	0.9	1.5	1.2
Ultra-urban	Maybe	Ideal	Yes	Maybe	Maybe	Maybe
Parking lots	Ideal	Yes	Ideal	Yes	Yes	Ideal
Roads	Maybe	Maybe	Maybe	Maybe	No	Yes
Residential	Maybe	Maybe	Maybe	Yes	Maybe	Yes
Landscaped	No	No	No	No	Maybe	Ideal
Rooftop	Yes	Yes	Yes	Yes	Yes	Yes

To Review

• https://chesapeakestormwater.net/training-library/stormwater-bmps/sand-filters/
• http://uwtrshd.com/assets/sand-flt-paper.pdf
• https://www.njstormwater.org/bmp_manual/NJ_SWBMP_9.9.pdf
• http://www.virginiadot.org/business/resources/LocDes/BMP_Design-Manual/Chapter_12_Stormwater_Sand_Filters.pdf

A shallow excavated surface depression containing prepared filter media, mulch, and planted with selected vegetation.