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This GIS toolkit and corresponding Python source code can be used to delineate groundwater capture zones (calculated radius and uniform flow equation methods). This GIS tool is free to use for non-commercial applications.
GNS Science has developed a capture zone delineation toolkit “GNS Groundwater Tools” (ready to use ArcGIS toolbox and corresponding source code) to automatically delineate well capture zones using either the calculated fixed radius or the uniform flow equation methods. The toolkit consists of both the capture zone delineation ArcGIS toolboxes for versions 9.3 and 10.0, as well as the core algorithms, programmed in Python, which can be implemented in other GIS applications (e.g., Quantum GIS).
The capture zone is mapped as a polygon for a groundwater well or a spring and represents the surrounding aquifer area sourcing groundwater to the outlet point. The corresponding manual provides of a brief theoretical background of the equations used in the calculated fixed radius and the uniform flow equation methods, describes the limiting assumptions of each method and demonstrates the use of the tools with ArcGIS software.
GNS Groundwater Tools 1.0 (ZIP, 49 KB)
GIS tools to delineate groundwater capture zones (PDF, 1.1 MB) (Manual)
Toews, M.W.; Gusyev, M.A. 2013. GIS tools to delineate groundwater capture zones, GNS Science Report 2012/06. 24 p.
2010 NGMP Calculator Vers NS-8 (ZIP, 650 KB)
Excel-based visualisation tool to assess the relative size of capture zone delineations using the simple method
Mike Taves (Toews) is a hydrogeologist and groundwater modeller. His primary interests include regional groundwater model development, simulation of groundwater-surface water interactions, and analysis of groundwater capture zones. Other specialists are with software development and geographical information systems.
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