A section of the water management system. see http://www.domesdaybook.co.uk/shropshire1.html see http://www.castleuk.net/castle_lists_midlands/138/corfhamcastle.htm see http://www.pastscape.org/hob.aspx?hob_id=111237 see http://www.discovershropshire.org.uk/html/search/verb/GetRecord/CCS:MSA219