Internal Drainage Boards (IDBs)

Each Internal Drainage Board is a local public authority established in areas of special drainage need in England and Wales. They have permissive powers to manage water levels within their respective drainage districts. IDBs undertake works to reduce flood risk to people and property and manage water levels to meet local needs. 

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IDBs: An Introduction | 'A Vision for Internal Drainage Boards in England & Wales'



Today, there are 111 IDBs in England covering 1.2 million hectares (9.7% of the total land area of the country). They play a key role in reducing flood risk to over 600,000 people and nearly 900,000 properties. They operate and maintain over 500 pumping stations, 22,000 km of watercourse, 175 automatic weed screen cleaners and numerous sluices and weirs.

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IDB Funding

The expenses of an IDB are predominantly funded by the local beneficiaries of the water level management work they provide. Each IDB sets a budget for its planned work in the forthcoming year and any investments it needs to make for future projects.

Find out more about how IDBs are funded


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