GIS tool to delineate groundwater capture zones

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Toews, M.W.; Gusyev, M.A. 2013 GIS tool to delineate groundwater capture zones. Lower Hutt, N.Z.: GNS Science. GNS Science report 2012/06 19 p.

Abstract: GNS Science has developed a capture zone delineation toolkit (GNS Groundwater Tools) to apply either the calculated fixed radius or the uniform flow equation methods to conduct capture zone delineation using ArcGIS 9.3 and 10.0. 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. This report 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. (auth)