Pa ystyriaeth mae Llywodraeth Cymru wedi'i rhoi i gyflwyno gofynion cynaeafu dŵr glaw, fel casgenni dŵr, ar ddatblygiadau newydd?
Wedi'i ateb gan Y Gweinidog Newid Hinsawdd | Wedi'i ateb ar 07/09/2022
In 2018 Welsh Government amended the building regulations so that when a new dwelling is erected the potential consumption of wholesome water by persons occupying the dwelling must not exceed 110 litres per person per day. The calculation method used to demonstrate compliance can take account of the water consumption savings that can be made when using rainwater harvesting systems.
The functional provisions of the building regulations also provide for differing arrangements for rainwater disposal which could include the use of water butts.