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→Geotextiles
===[[Geotextiles]]===
===[[Geotextiles]]===
To avoid clogging, the use of geotextile on the bottom of bioretention facilities or between filter media and underdrain aggregate materials should be avoided. Including a [[Choker layer| choker layer] to maintain separation
To avoid clogging, the use of geotextile on the bottom of bioretention facilities or between filter media and underdrain aggregate materials should be avoided. Including a choker layer to maintain separation
between filter media and underlying aggregate is recommended instead. Geotextile socks should be installed on underdrain pipes with 360 degree perforations. Alternatively a strip of geotextile may be placed over the pipe to limit migration of fines from the overlying filter media into the pipe. Geotextile may be installed on the sides of the bioretention cell to maintain separation between backfill materials during construction. Geotextile used for weed control (i.e. landscape fabric) within the filter media bed or under mulch should be avoided.
between filter media and underlying aggregate is recommended instead. Geotextile socks should be installed on underdrain pipes with 360 degree perforations. Alternatively a strip of geotextile may be placed over the pipe to limit migration of fines from the overlying filter media into the pipe. Geotextile may be installed on the sides of the bioretention cell to maintain separation between backfill materials during construction. Geotextile used for weed control (i.e. landscape fabric) within the filter media bed or under mulch should be avoided.
Geotextile that is used should have material specifications that conform to Ontario Provincial Standard Specification (OPSS) 1860 for Class II geotextile fabrics. Should be woven monofilament or non-woven needle punched fabrics. See [[Geotextiles]] for further guidance.
Geotextile that is used should have material specifications that conform to Ontario Provincial Standard Specification (OPSS) 1860 for Class II geotextile fabrics. Should be woven monofilament or non-woven needle punched fabrics. See [[Geotextiles]] for further guidance.