In the construction of the works the Authority may deviate laterally to any extent not exceeding the limits of deviation shown on the deposited plan marked “The West of Scotland Water Authority (Dervaig-River Bellart) Water Order 1997 Plan of Catchment Area, Location Plan and Plans and Sections of Works No 1” and they may also deviate vertically from the levels shown on that plan to any extent:
Provided that–
(a)no structure within the watercourse shall be constructed at a greater height above the general bed level than that shown on the said plan and 150 millimetres in addition thereto; and
(b)except for the purposes of crossing a stream, canal, dyke, watercourse or railway, or of crossing any lands where the consent of all persons interested in those lands has been obtained, no pipe or other conduit or aqueduct shall be raised above the surface of the ground otherwise than in accordance with the said plan.