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===Geotextile===[[Geotextiles]] are not always necessary and may be prone to [[clogging]]. Consider using courses of finer aggregates or sand instead.
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For more information, also see [[Aggregates]] page.
For more information, also see [[Aggregates]] page.
===Sizing stone reservoirs===
===Sizing stone reservoirs===
'''[[Permeable paving: Sizing]]'''
'''[[Permeable paving: Sizing]]'''
===Geotextile===
[[Geotextiles]] are non-woven needle punched, or woven monofilament geotextile fabric that may be placed between the storage reservoir and native soil to maintain separation. Geotextiles are commonly used on low strength soils (CBR <4). Where expansive clays are present, a non-infiltrating design may be necessary. If used, geotextile socks around perforated pipes should conform to ASTM D6707 with minimum water flow rate conforming to ASTM D4491 (12,263 L/min/m2 at 5 cm head).
===Edge Restraints===
Pavers must abut tightly against the restraints to prevent rotation under load and any consequent spreading of joints. The restraints must be able to withstand the impact of temperature changes, vehicular traffic and snow removal equipment. Metal or plastic stripping is acceptable in some cases, but concrete curbs are preferred. Concrete curbs should be supported on a minimum base of 150 mm of aggregate.
===Landscaping===
Adjacent landscaped areas should drain away from permeable pavement to prevent sediments from running onto the surface. Urban trees also benefit from being surrounded by permeable pavement rather than impervious cover, because their roots receive more air and water.
[[Monitoring wells]]: see “Deeper Wells” section
===Modeling permeable paving in the Treatment Train Tool===
===Modeling permeable paving in the Treatment Train Tool===