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Outlets

A gutter’s discharge capacity increases with the depth of water over the outlet. The best way to increase the head is to discharge the open end of the gutter into a rainwater head or sump. Swirl at the outlet reduces its performance, so the positioning of the outlet is important.

Outlets must be placed at a distance less than or equal to the outlet diameter from the nearest vertical side of the sump.

Rainwater heads are situated outside the building envelope, and sumps are internally located.

They both serve to increase the head of water entering a downpipe and to provide an overflow capacity to safely discharge water when the downpipe capacity is compromised or exceeded. The overflow should be obvious so discharging water warns the occupant that the downpipe capacity has been exceeded or the primary downpipe is blocked.

 

Internal Gutter Discharging into a Rainwater Head

 

 

External Gutter Discharging into a Rainwater Head

 

 

Clause: 
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Clause Number: 
5.6
/cop/roof-drainage/outlets
Revision Category: 
2 - Editing and rearrangement
Revision Detail: 

The clause was renamed, and some content from Outlets and Downpipes relating to Outlets was moved to this clause. No changes to recommendations.