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Application of drainage requirements to small roofs and balconies
78(1)NI-wide·Technical Booklet N Drainage
Regulation 82 shall not apply to a drainage system intended for use in connection with a roof or balcony of 6 m2 or less in area, unless that roof or balcony receives a flow of rainwater from another
drainagerainwaterDefinition of rainwater drainage
78(2)NI-wide·Technical Booklet N Drainage
"Rainwater drainage" includes gutters, pipes, drains and fittings which convey rainwater only;
drainagerainwaterDischarge capacities of rainwater drains running full
Diagram 4.1NI-wide·Technical Booklet N Drainage
Diagram 4.1 Discharge capacites of rainwater drains running full Flow rate (litres per second) by gradient: Gradient | 150 mm diameter | 100 mm diameter | 75 mm diameter 1:10 | 30 | 20 | 10 1:20 | 9
drainagerainwatersizing