Permitted developmentE+W
A. Development by or on behalf of a sewerage undertaker consisting of—
(a)development not above ground level required in connection with the provision, improvement, maintenance or repair of a sewer, outfall pipe, sludge main or associated apparatus;
(b)the provision of a building, plant, machinery or apparatus in, on, over or under land for the purpose of survey or investigation;
(c)the maintenance, improvement or repair of works for measuring the flow in any watercourse or channel;
(d)any works authorised by or required in connection with an order made under section 73 of the Water Resources Act 1991 (power to make ordinary and emergency drought orders);
(e)any other development in, on, over or under their operational land, other than the provision of a building but including the extension or alteration of a building.