Changes

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* Should be minimum 150 mm dia. perforated HDPE or equivalent material, smooth interior wall and continuously perforated with geotextile sock.

* Should be minimum 150 mm dia. perforated HDPE or equivalent material, smooth interior wall and continuously perforated with geotextile sock.

* A standpipe from the underdrain pipe to the growing medium or pavement surface can be used for inspection and maintenance. The top of the standpipe should be covered with a sealable cap and secured with a vandal-proof fastener.

* A solid standpipe connected to the underdrain pipe and extending to the growing medium or pavement surface can be used for inspection and maintenance access. The top of the standpipe should be covered with a sealable cap or plug and secured with a vandal-proof fastener.

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|'''Stormwater Distribution Pipe'''

|'''Stormwater Distribution Pipe'''