If you want to carry out works within or over an ordinary watercourse, you will need to contact the Local Authority in relation to obtaining an Ordinary Watercourse Consent.
Os ydych am wneud gwaith o fewn neu dros gwrs dŵr cyffredin, bydd angen i chi gysylltu â'r Awdurdod Lleol i gael Caniatâd Cwrs Dŵr Cyffredin.