Rainwater Heads, Sumps, and Overflows

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 downpipe capacity is compromised or exceeded. The overflow should be obvious so discharging water warns the occupant that downpipe capacity has been exceeded or the primary downpipe is blocked.




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New clause.