in particular the analytical solution by glover and balmer while being one of the simplest has been widely applied in a policy context eg jenkins nebraska dnr this equation allows to derive the stream depletion caused by a specific well after a defined pumping period at a constant rate of impacts based on pumping rates distance from the stream aquifer coefficients storage transmissivity and a complementary error function see annex a for details the equation can be modified to account for seasonal pumping similarly other more sophisticated versions are available for surfacewater groundwater interactions such as partially penetrating wells or streambed clogging eg hunt hunt