Stagnation points in the aquifer flow field are often a sort of separation region between different velocity areas. They are generally located in the middle of an area where water circulation is limited and flow velocity is quite zero.
The presence of a stagnation point usually indicates a special condition of stability about water supplies, where the limited supply of oxygenated water and negative redox potential also can create some bad conditions, but relatively protected from other forms of pollution.
In this note some rules for a fast location of stagnation points due to withdrawal of two extraction wells are developed. The method can avoid a numerical or analytical formulation. Both analytical method and theoretical one linked to a vector velocity field interacting to groundwater during pumping well barrier are shown.