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The “Association of Drainage Authorities: Administrative Boundaries - Internal Drainage Districts in England” dataset has been published by the Environment Agency on behalf of the Association of Drainage Authorities (ADA).

This dataset shows the boundaries for all Internal Drainage Districts (IDD) in England and is based on information provided by the Association of Drainage Authorities and the Environment Agency.

Under the Land Drainage Act 1991, internal drainage districts are areas defined as deriving benefit or avoiding danger as a result of drainage operations. Each internal drainage board (IDB) is a local independent public body that manages water levels in the corresponding internal drainage district.

The Environment Agency currently manages the “River Arun Internal Drainage District”. The River Arun Internal Drainage District is included in the “Association of Drainage Authorities: Administrative Boundaries - Internal Drainage Districts in England” product but is also available as a separate data product published by the Environment Agency.

You can access the datasets below:

IDD in England - https://environment.data.gov.uk/dataset/84ccfa1b-df6b-42d3-b6bc-03c98e8c207c

River Arun IDD - https://environment.data.gov.uk/dataset/a2e2ed7e-342e-4f19-bb68-0bf2e681f059

For any queries about IDB activities you can contact the ADA at:  https://www.ada.org.uk/contact-us/

The ADA also provide an interactive map where you can find out the contact details for individual drainage districts here: https://www.ada.org.uk/idb-map/