Arterial Watercourses (Main Drains) were cut to convey surplus water for the purpose of agricultural land drainage. Most Internal Drainage Boards do not have statutory powers of navigation defined by Act of Parliament, so a public (common) right of navigation does not apply. For this reason there will be no licensing system in place for users of recreational craft. We discourage paddlers from using the Board's flood drainage infrastructure for safety reasons. Water levels and currents can change without warning as a result of pumping station operations.