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The Association of Drainage Authorities (ADA) is the association for water level management (WLM) organisations in the United Kingdom, with over 230 members. They are recognised as the national representative for Internal Drainage Boards (IDBs) in England and Wales.

Listed below are the Internal Drainage Boards that cover the Fens area grouped according to the Regional Flood and Coastal Committee areas ;

Anglian Central

Middle Level Commissioners (website)

Current Biodiversity Plans (webpage)


MLC Biodiversity Targets 2015

Anglian Northern

Witham Fourth Internal Drainage Board (website)

Current Biodiversity Plan (Document)

Black Sluice Internal Drainage Board (website)

South Holland Internal Drainage Board (website)

Welland and Deepings Internal Drainage Board (website)