Internal drainage boards (IDB) are public bodies that manage water levels in some areas where there is a special need for drainage. These areas are known as internal drainage districts (IDD). IDBs undertake works to reduce flood risk to people and property, and manage water levels for agricultural and environmental needs.
Today, there are 110 IDBs in England whose districts cover 1.2 million hectares (9.7% England’s landmass). 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.