[{"fact":"224b3800a5d2a58c2534da561aa917853766e04c252d5abf956a30bcd2a180f9","entity":11500232,"reference-entity":"","field":"description","value":"Water or hydraulic power undertakings. Development required for the purposes of the undertakings of any of the following descriptions, that is to say:- (i) the laying underground of mains, pipes, or other apparatus; (ii) the improvement, maintenance or repair of watercourses or land drainage works; (iii) the maintenance or repair of works for measuring the flow in any watercourse or channel or the improvement of any such works (otherwise than by the erection or installation, by way of addition or replacement, of any structures of the nature of buildings or of any plant or machinery); (iv) the installation in a water distribution system of booster stations, meter or switch gear houses, not exceeding(except where constructed underground elsewhere then under a highway) 29 cubic metres in capacity; (v) the erection, construction or placing of buildings, plant or apparatus on land, or the carrying out of engineering operations, in, on, over or under land, for the purpose of surveys or investigations. (vi) any other development carried out in, on, over or under the operational land of the undertaking except:- (a) the erection, or the reconstruction or alteration so as materially to affect the design or external appearance thereof, of buildings; (b) the installation or erection, by way of addition or replacement, of any plant or machinery, exceeding 15 metres in height or the height of the plant, machinery, structure or erection so replaced, whichever is the greater.","entity-name":"Development by statutory undertakers","entity-prefix":"permitted-development-right","entity-reference":"XVIII(C)-1977","earliest-entry-date":"2026-06-10","latest-entry-date":"2026-06-10","latest-resource":"3aa369d7c1964524f55cc3b369eeeb0c8650f42799658e725e28d5e41b03ad98","resources":""}]