Development of a Digital Model of Ground-Water Flow in Deeply Weathered Crystalline Rock, Chester County, Pennsylvania

摘要

The model simulates recharge to, flow through, and discharge from the water-table aquifer in a 5.98 square mile basin representative of most of Chester County, Pennsylvania. The two-dimensional finite-difference model of Trescott, Pinder, and Larson was used. The way ground-water evapotranspiration varies with depth was modified, and a minimum transmissivity was added to prevent the model from 'going dry'. Tests of the model showed good correlation with field data, but also showed that additional information would make the model more reliable.