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I I. I I I I I I I Ie I I I I I I I. I I program package for calculation of the interactions between surface water and groundwater. As such, limited pumping simulations were perfonned. This model implementation has the advantage that it uses a groundwater model code which is currently available and accepted by the modeling community. The MODFLOW code is available for PC's and is well understood and widely used. Unfortunately, the results of simulations perfonned for this project probably do not directly address the problems of interest here. Simulations were perfonned for pumping rates similar to those used by Banta, but the simulations were only performed for the 40-year period from 1958 to 1998. As such, the existing simulation results will not help in estimation of the expected economic life of the aquifers. We have contacted Ms. Schenk about availability and use of this model. The model setup as used in the project is available. The simulations perfonned by Banta were not reproduced. Some changes may be required in the model setup for it to accurately reproduce Banta's results. Since the goal of the project was development of a new package to calculate interactions between rivers and the bedrock aquifers, the original river setup may not be available. 4.5 launarais'Model The model developed by Schenk for more realistic simulation of interactions between surface water and groundwater was used as the basis for pumping simulations during drought periods by S. R. J aunaraj s (J aunaraj s, S. R., 1991, A Modeling Approach for Assessing the Feasibility of Ground-Water Withdrawal from the Denver Basin During Periods of Drought, Colorado School of Mines). This project involved some recalibration of the MODFLOW implementation of the Denver Basin model and 40-year simulations of increased pumping during hypothetical drought cycles. j Due to the simulation period and the pumping stresses, the results of this work are probably not directly applicable to this project. If recalibration of the model is envisioned, the results of this effort should probably be consulted as it represents one method of reaching a better 9 HRS WATER CONSULTANTS, INC.