AnsTrack is a particle tracking tool used to define Wellhead Protection Areas, delineate well capture zones, calculate groundwater flow paths and travel times
![Wellhead protection area calculator](images/AnsZone.gif)
The wellhead protection area (WHPA) is the area from which groundwater flows to a well within a specified time period. Extent and shape of WHPA are controlled by hydrogeological conditions and pumping regime.