From January 7th 2019, all new developments where the construction area is of 100m 2 or more will require sustainable drainage to manage on-site surface water.
O 7 Ionawr 2019, bydd rhaid i bob datblygiad newydd o 1 dŷ neu fwy, neu safle adeiladu sy’n 100m 2 neu fwy, gael draeniau cynaliadwy i reoli’r dŵr wyneb ar y safle.