“Managed wetland” means those diked areas in the marsh in which water inflow and outflow is artificially controlled or in which waterfowl food plants are cultivated, or both, to enhance habitat conditions for waterfowl and other water-associated birds, wildlife, or fish, regardless of whether such areas are used for hunting or fishing or nonconsumptive uses such as nature study, photography, and similar passive wildlife activities, or a combination of both such consumptive and nonconsumptive uses.