Simple Finite Difference Model

Simulation of 1 or 2 Layer Aquifer System, Uniform Properties, Well Storage Capacity, Delayed Yield, Leakage, Dewatering, Radial Flow to Production Well, Finite-difference Approximation for Pumping Test Design

Program based in part on program presented by Rushton, K.R. and S.C. Redshaw, 1979, Seepage and groundwater flow-numerical analysis by analog and digital methods, John Wiley & Sons, Ltd. New York, and Rathod, K.S. and Rushton, K.R. 1984, Numerical method of pumping test analysis using microcomputers, GROUND WATER Vol.22, No.5. For details on equations and assumptions see Walton, W.C. 1985, 2nd Edition, Practical aspects of groundwater modeling, NATIONAL WATER WELL ASSOC, Pages 388-391.

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Data Base (Choose Nonleaky, Leaky or Water Table Test)		Data Needs
Aquifer Horizontal Hydraulic Conductivity (feet/day) Between 4,000 and 0.0000001 depending on rock or sediment type		All
Confining Unit Vertical Hydraulic Conductivity (feet/day) Between 0.1 and 0.00000001 depending on rock or sediment type		Leaky
Aquifer Thickness (feet)		All
Aquifer Vertical Hydraulic Conductivity (feet/day) Between 0.5 and 0.01 times horizontal hydraulic conductivity depending on degree of stratification		Water Table
Confining Unit Thickness (feet)		All
Confined Aquifer Storage Coefficient (dimensionless)		All
Water Table Aquifer Storage Coefficient (dimensionless and nonzero)		All
Production Well Effective Radius (feet)		All
Top of Aquifer Depth (feet)		All
Initial Water Level Depth (feet)		All
Production Well Discharge Rate (gallons per minute)		All
Length of Test (minutes) There are 1,440 minutes per day		All