From Longman Dictionary of Contemporary Englishwater meadowˈwater ˌmeadow noun [countable] SGWETa field that is near a river and that is sometimes flooded
Examples from the Corpus
water meadow• This faces out on to a flooded water meadow full of grazing buffaloes.• This point was appreciated by members of the audience thinking of Alton's own water meadow problem.• Another area needing careful management is the water meadow, where control of water flow is vital.• I think Concorde's a wonderful design but I wouldn't want it in this water meadow. 