WRDS Library [Home]
Digital Library Publications Videos Card Catalog

WWRC 93-09
Comparison of Wellhead Protection Delineation Methods with Respect to Nonpoint Pollution Sources


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

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
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.
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.

Water Resources Publications List
Water Resources Data System Library | Water Resources Data System Homepage