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**Well(s), of 100 - 150 mm diameter perforated pipe, should extend to the bottom of the facility. **Where a horizontal underdrain is being installed, an upstream and a downstream well should be coupled to the underdrain pipe. The pair of wells can then be used to flush out the length of underdrain if required.
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==Maintenance and inspection==
==Maintenance and inspection==
*Well(s), of 100 - 150 mm diameter perforated pipe, should extend to the bottom of the facility.
*Where a horizontal underdrain is being installed, an upstream and a downstream well should be coupled to the underdrain pipe. The pair of wells can then be used to flush out the length of underdrain if required.
*The exposed tops of all wells should be fitted with lockable caps.
==Material specifications==
==Material specifications==