Ground water protection planning using the ERDAS geographic information system; automation of DRASTIC and time-related capture zones

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Authors:Whittemore, Donald O.; Merchant, James W.; Whistler, Jerry; McElwee, Carl D.; Woods, John J.
Author Affiliations:Primary:
Kans. Geol. Surv., Lawrence, KS, United States
Other:
Univ. Kans., United States
Volume Title:Proceedings of the NWWA FOCUS conference on Midwestern ground water issues
Volume Authors:Renz, Michael E., coordinator; Graves, Barbara J.; Butcher, Kathy
Source:p.359-374; NWWA FOCUS conference on Midwestern ground water issues, Indianapolis, IN, Apr. 21-23, 1987, coordinated by Michael E. Renz, Barbara J. Graves and Kathy Butcher. Publisher: Natl. Water Well Assoc., Dublin, OH, United States
Publication Date:1987
Note:In English. 10 refs.; 1 table, sketch maps
Summary:A geographic information system (GIS) is being applied to Harvey County, Kansas, to improve planning efforts by state and local governments in water-resources protection. The GIS package is a user-friendly, flexible, standalone system named ERDAS (Earth Resources Data Analysis System) operating on an IBM PC-AT microcomputer. The study area includes part of a major unconsolidated aquifer used for both municipal supply and irrigation. Kansas has developed a groundwater-quality-protection strategy that recommends the development and implementation of aquifer and/or well-field-protection plans by all public water systems using groundwater. Methodologies applicable to the planning process have been automated for use on the GIS. One of these is the standardized system called DRASTIC developed by the National Water Well Association. Digital GIS data for the seven hydrogeologic factors used in DRASTIC can be computer-processed to produce a map of index values ranking relative vulnerability with respect to groundwater-pollution potential and the boundaries of hydrogeologic settings. Another methodology automated is the generation of time-related capture zones for pumping wells in a well field. An interactive computer program in conjunction with the GIS computes individual capture-area curves given the coordinates and average pumping rate of the well, the average values for the aquifer parameters, and the capture-zone time. The capture-curve equation is solved analytically using the method of successive approximations and three different arrangements of the equation depending on regions of convergence. Results for these methodologies can be easily recomputed for revised or additional data or to determine the sensitivity of the resultant map areas to estimated error in the hydrogeologic data. The GIS also allows convenient overlaying of the DRASTIC index and setting areas and capture-zone boundaries on maps of anthropogenic features such as land use. (See also W88-11031) (Author 's abstract)
Subjects:Computer programs; Data processing; Ground water; Hydrogeology; Information systems; Surveys; Water quality; Harvey County Kansas; Kansas; United States; Earth Resources Data Analysis System; ERDAS
Record ID:1987065023
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from USGS product, Selected Water Resources Abstracts, Reston, VA, United States
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