Internal Drainage Board - Current Internal Drainage Boards of England and Wales

Current Internal Drainage Boards of England and Wales

There are 121 internal drainage boards in Great Britain in 2012, 120 in England and 3 in Wales (Powysland IDB and Lower Wye IDB cross the border). IDBs cover 1.2 million hectares of England (9.7% of the total land area of the country) and 28,500 hectares of Wales (1.4% of the total land area of the country). Areas around The Wash, the Lincolnshire Coast, the lower reaches of the Trent and the Yorkshire Ouse, the Somerset Levels and the Fens have concentrations of adjacent IDBs covering broad areas of lowland. In other parts of the country IDBs stretch in narrow ‘fingers’ up river valleys, separated by less low lying areas, especially in Norfolk and Suffolk, Sussex, Kent, West Yorkshire, Herefordshire/Shropshire and the northern Vale of York. The largest IDB (Lindsey Marsh DB) covers 52,498 hectares and the smallest (Cawdle Fen IDB) 182 hectares. 24 of the county councils in England include one or more IDB in their area as do six metropolitan districts, and 109 unitary authorities or district councils.

The Association of Drainage Authorities holds a definitive record of all IDBs within England and Wales and their boundaries.

Internal Drainage Districts of England and Wales

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