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*Where drainage or conveyance to a downstream facility is a greater priority, the base of the reservoir and the underdrain pipe may have a gradient of up to 1-2%.
*Where drainage or conveyance to a downstream facility is a greater priority, the base of the reservoir and the underdrain pipe may have a gradient of up to 1-2%.
==Maintenance and inspection==
==Inspection and maintenance==
[[File:45 degs.PNG|thumb|Schematic of pipes and connectors]]
[[File:45 degs.PNG|thumb|Schematic of pipes and connectors]]
[[File:Jet cleaning.jpg|thumb|Diagram of hydrojetting cleaning apparatus]]
[[File:Jet cleaning.jpg|thumb|Diagram of hydrojetting cleaning apparatus]]