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→Monitoring wells and perforated pipe access structures
===Monitoring wells and perforated pipe access structures===
===Monitoring wells and perforated pipe access structures===
*Monitoring well should be a vertical standpipe consisting of an anchored 100 to 150 mm diameter pipe with perforations along the length within the reservoir, installed to the bottom of the facility, with a lockable cap. The well allows monitoring of post-event drainage times. See [[Monitoring wells]] for further guidance.
*Monitoring well should be a vertical standpipe consisting of an anchored 100 to 150 mm diameter pipe with perforations along the length within the reservoir, installed to the bottom of the facility, with a lockable cap. The well allows monitoring of post-event drainage times. See [[Wells |Monitoring wells]] for further guidance.
*Access structures, used for inspection and maintenance of the underdrain perforated pipes may be a maintenance hole or vertical standpipe connected to the pipe. Couplings used for standpipe connections should be 45° to facilitate pipe access by push camera or cleaning equipment.
*Access structures, used for inspection and maintenance of the underdrain perforated pipes may be a maintenance hole or vertical standpipe connected to the pipe. Couplings used for standpipe connections should be 45° to facilitate pipe access by push camera or cleaning equipment.