In particular, the analytical solution by Glover and Balmer (1954), while being one of the simplest, has been widely applied in a policy context (e.g. Jenkins, 1968, Nebraska DNR, 2007). 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 3.A for details). The equation can be modified to account for seasonal pumping. Similarly, other more sophisticated versions are available for surface-water groundwater interactions such as partially penetrating wells or streambed clogging (e.g. Hunt, 1999, Hunt, 2012).