water leat
/ˈwɔːtə ˌliːt/(also water leet)
noun
An open watercourse to conduct water, especially for agricultural or industrial purposes. Also: (in south-western England) a piece of land irrigated by such a watercourse; a water meadow (now historical ).
Origin
Old English; earliest use found in Harley Glossary. In some forms (i) from water + Old English gelaēt, by-form of gelaēte.