ESPERE, a multiple-method Microsoft Excel application for estimating aquifer

Several methods can be used to estimate groundwater recharge. These vary in terms of time scale and the nature of the data they treat. ESPERE, an MS Excel application, uses several different commonly-used methods to rapidly and simultaneously estimate recharge. It makes it possible to quantify recharge with a monthly and annual time step and to visualize related uncertainties. It was designed to limit the number and type of parameters that must be entered by the user so that it could be used in any context, including those in which knowledge is limited. It provides an excellent means of analyzing the behavior of an aquifer in response to recharge.