WWRC 93-09
Comparison of Wellhead Protection Delineation Methods with Respect to Nonpoint Pollution Sources
Synopsis
This final report contains a listing of the tasks to be performed
by the project followed by the results obtained from the project in
terms of these tasks.
The purpose of this project was to evaluate the different methods
used to delineate wellhead protection areas using EPA guidelines
and the several suggested analytical and numerical models for
defining wellhead protection areas for unconfined and confined
aquifers typical of Wyoming. The specific tasks identified for
this project are detailed below:
Task One: Analysis of Delineation Techniques and Collection of
Data
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The specific objectives under Task I were: (1) examination of
the EPA defined analytical and numerical models for defining
wellhead protection areas to determine the type and quantity
of data required for each models application; (2) collect
required data for model evaluation for a confined aquifer
(Casper Formation near and surrounding Laramie) and ar
unconfined aquifer (alluvial aquifer near and surrounding
Torrington); and (3) evaluate the modeling techniques
developed and tested at Laramie and the publications of EPA on
"Wellhead protection strategies for confined-aquifer settings"
and "Delineation of wellhead protection areas in fractured
rocks" to suggest methods which would be most applicable for
wellhead protection delineation for different geological
settings which exist in Wyoming.
Task Two: Modeling, Calibration and Comparison
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The specific objectives under Task 2 were: (1) to evaluate
each of the models for wellhead protection delineation using
the data obtained on the confined (Casper Formation aquifer)
and unconfined (Torrington area aquifer) aquifers; and (2)
develop a calculated fixed radius evaluation method and
provide relevant information to be included in a wellhead
protection plan for small community water supply systems who
could utilize this technique.
Task Three: Comparison of Determined Protection Areas to Overall
Protection Goals.
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The specific objective under Task 3 was to take the wellhead
protection areas determined from each model under Task 2 and
evaluate them in light of the three levels of protection goals
outlined by EPA.
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