Implementation of Sustainable Drainage Systems on New Developments: https://consultations.gov.wales/consultations/implementation-sustainable-drainage-systems-new-developments-draft-regulations-and
Gweithredu Systemau Draenio Cynaliadwy ar Ddatblygiadau Newydd: https://ymgyngoriadau.llyw.cymru/ymgyngoriadau/gweithredu-systemau-draenio-cynaliadwy-ar-ddatblygiadau-newydd-rheolau-drafft-safonau