In 1857 the Thames Conservancy Board was established.
The administration of the law devolves upon local forest conservancy boards.
The Pruth and Sereth are navigable for a short distance by small sailing craft; the conservancy of the Danube (q.v.) is controlled by a European commission, which sits at Galatz.
Above the intakes of the water companies (at Hampton or in the vicinity), the Thames Conservancy has enforced the requirements of parliament that no sewage or other pollution shall be allowed to pass into the Thames, into its tributary streams, or even into any water communicating with them.
The works as subsequently maintained by the Thames Conservancy ensure an efficient head of water during the drier seasons of the year, and facilitate the escape of winter floods.