U.S. GEOLOGICAL SURVEY
Water-Resources
Investigations Report 96-4229
Delineation of Areas Contributing Recharge
to Municipal Wells in Three Selected Confined-Glacial
Aquifers in Erie County, New York
By Richard M. Yager, Todd S. Miller, and John Thayer
CONTENTS
Abstract
Introduction
Purpose and scope
Acknowledgments
Methods of Analysis
Principles of analytical and numerical methods
Determination of aquifer characteristics
Development of ground-water flow models
Delineation of Areas Contributing Recharge to Municipal Wells
Alden study area
Hydrogeologic setting
Model design
Simulated ground-water flow
Reliability of estimates
Collins study area
Hydrogeologic Setting
Model Design
Simulated Ground-Water Flow
Reliability of Model Results
Holland study area
Hydrogeologic setting
Model design
Simulated ground-water flow
Reliability of model results
Summary
Alden
Collins
Holland
References Cited
Figures
1. Map showing pertinent geographic features of Erie County, N.Y. and locations of study sites
2. Map showing geographic features and aquifer boundary of the Alden area
3. Generalized geologic section showing stratigraphy of glacial deposits
in Alden area
4. Diagram showing model representation of glacial sediments and weathered
bedrock in model of Alden area
5. Map showing boundary conditions in the model of Alden area
6. Map showing steady-state distribution of hydraulic head (model A)
in Alden area
7. Maps showing contributing areas in Alden area to:
A. Discharge boundaries in model A
B. Municipal wells in model C
8. Map showing geographic features, aquifer boundary and altitude of bedrock surface of Collins area
9. Generalized geologic sections A-A’ and B-B’ showing stratigraphy
of glacial deposits in Collins area
10. Map of Collins area and location of modeled area showing pertinent geologic features
11. Model grid showing boundary conditions in the Collins area
12. Map showing hydraulic head and directions of ground-water flow in Collins area
computed by steady-state simulation in:
A. Model A (high recharge rate)
B. Model B (low recharge rate)
13. Map showing contributing areas to Collins municipal well in:
A. Model A (high recharge rate)
B. Model B (low recharge rate)
14. Map showing location of Holland study area
15. Map showing pertinent geographic features and aquifer boundary
in Holland area
16. Generalized geologic sections A-A’ and B-B’ showing stratigraphy
of glacial deposits in the Holland area
17. Diagram showing model representation of glacial sediments
in Holland area
18. Map showing steady-state distribution of hydraulic head (model A)
in Holland area
19. Map showing contributing areas (model A) in Holland area to:
A. Discharge boundaries of confined aquifer (layer 2)
B. Municipal well from overlying glacial sediments (layer 1)
Tables
1. Assigned and estimated values for aquifer properties in ground-water flow models of Alden area,
Erie County, N.Y.
2. Water budget for confined aquifer at Alden, Erie County, N.Y. under average steady-state conditions
in model A
3. Sizes of areas contributing recharge to municipal wells, and estimated recharge from upland runoff, in
models of Alden area, Erie County, N.Y.
4. Simulated water budget for confined aquifer at Collins, Erie County, N.Y., model A (high recharge rate),
model B (low recharge rate)
5. Values assigned to aquifer properties in ground-water flow model of Holland area, Erie County, N.Y.
6. Water budget for confined aquifer at Holland, Erie County, N.Y., under average steady-state conditions in
model A
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