6SExcept as otherwise provided under the scheme the local authority may dispose of excavated spoil, so far as not required for the purpose of carrying out the operations or executing any temporary works, by constructing spoil banks along the natural banks of any watercourse situated within the limits of lateral deviation shown on the plans referred to in the scheme, or within other land so shown as required for the purpose, or by spreading the spoil on the land adjacent to the natural banks of any such watercourse, or by carrying the spoil away for disposal at a tip, or for sale; and the proceeds of any such sale shall be applied by the local authority in defraying their expenditure in carrying out the operations:
Provided that the local authority shall not dispose of spoil under this paragraph unless they have first given to the owner thereof (unless he cannot be found) an opportunity of taking possession of it.