7Except as otherwise provided under the order, the authorised persons may dispose of excavated spoil, so far as not required for the purpose of executing the works or 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 and specifications referred to in the order, 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.