this rule defines zones based on wells expected to pump at least of their water from an adjacent stream over a year period nebraska dnr as stream depletion increases with both time and proximity to a stream all else being equal the rule is more stringent than the rule and will cover a large area adjacent to streams where stream depletion is a concern in nebraska numerical methods have been used in the republican river basin and the big blue river basin modflowbased and in the platte river basin cohystbased