A computer-based tool used in the wellhead protection decision-making process to delineate ground-water capture zones and isochrones of residence time - Unlike similar programs, WhAEM can accommodate fairly realistic boundary conditions, such as streams, lakes, and aquifer recharge due to precipitation. The software system consists of:
1. GAEP (Geographic Analytic Element Preprocessor), which is used to simplify preparation of input data.
2. CZAEM (Capture Zone Analytic Element Model), which generates output on ground-water capture zones and residence times. CZAEM accurately defines capture zone boundaries by first determining all stagnation points and dividing streamlines in the flow domain.