[KBCN withdrawn] ~ Surface water run-off – Rainwater harvesting

This KBCN has been withdrawn and is no longer valid.

This is because the BS 8515 has been withdrawn and its replacement makes no reference to storm water control.Β 

KBCN withdrawn on 26/09/18:

BS 8515 Rainwater harvesting systems: Code of Practice, Annex A (236) must be followed where rainwater harvesting systems are relied upon for storm water control. To ensure flood risk is not increased if the rainwater harvesting system is, for some reason, unavailable, the exceedance flow route capacity provided in accordance with CIRIA report C635 should ignore the beneficial effect of the rainwater harvesting system.