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\begin{document}

\title{An Open-Source Web Tool for Visualizing Estimates of Well Capture Zones
Near Surface Water Features}



\author[1]{Andrew J. Wiebe}%
\author[1]{Jeffrey M. Mckenzie}%
\affil[1]{McGill University}%


\vspace{-1em}



  
  \date{June 17, 2024}


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\begin{abstract}
Identifying areas of the land surface and surface water features (e.g.,
rivers, lakes, etc.) likely to contribute groundwater recharge to a
public groundwater supply well is typically a first step toward source
water protection. Identifying the contributions from these areas is
important for assessing contamination sources, developing land use
management strategies, and mitigating groundwater risk for drinking
water supply. Simple analytical solutions that employ Darcy's Law are
unable to account for surface water boundary conditions within the flow
system. Therefore, capture zone delineation is typically performed using
three-dimensional, fully distributed numerical models that require
considerable numbers of parameters, stratigraphic data, and user
expertise. However, advanced analytical solutions exist that can provide
approximations to such solutions using few parameters.In this work, the
R Shiny web platform is developed to create an open-source application
to allow Internet users to visualize potential flow systems near wells
in the vicinity of surface water features. Assumptions include
homogeneous stratigraphy and aquifer thickness, a steady state flow
field, and relatively simple aquifer geometry. The web tool is currently
being developed with a focus on Yukon Territory in northern Canada,
where most of the population relies on groundwater, but less work has
been done on the analysis of well vulnerability and source water
protection than in southern Canada. The results are intended for
estimation and education purposes and will be compared with numerical
model results for some sites with pre-existing investigations.~Abstract
ID: 1168805%
\end{abstract}%



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\textbf{Plain Language Summary:}

Water can flow into the groundwater system beneath the land surface or
from surface water bodies like rivers and lakes. A capture zone map
shows which land and surface water areas have groundwater flow paths
that are likely to reach a groundwater well. Drawing this kind of map is
often the first step for protecting drinking water from contamination.
Simple equations can sometimes be used to draw these maps if there are
no surface water bodies. If there are, then more complicated computer
models are needed.

~

In this work, a freely available Internet app is developed to show what
groundwater flow near wells and surface water could look like. The app
development has focused on Yukon Territory in northern Canada, where
most people use groundwater. The results show a rough estimate to
educate people about the possible area where water flows to a well.

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