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I I. I I I I I I I ,Ie I I I I I I I. I I area to give better resolution from a finer grid. Additional changes have been made to more accurately simulate interactions between surface water and groundwater in the southern part of the basin. The smaller grid size over much of the basin makes this a better choice for use as a basis for estimation of expected groundwater levels in the aquifer. As in the Robson model, several simulations were performed to calculate groundwater level changes in response to different levels of groundwater use. For our purposes, the most useful simulations will likely be: 1. SIMBASE - Pumping in southern part of basin constant at 1985 level. Pumping in northern part of basin as Robson FULL simulation 2. SIMGRO - Pumping in southern part of basin increases in response to growing population. Pumping in northern part of basin as Robson FULL simulation We have contacted Mr. Banta regarding availability of the model code, setup, and results. FORTRAN code for the Trescott-Larson model as used for the steady state and transient simulations is available on disk, though it is set up for use on a Prime computer. Changes would likely be required for this model to be compiled and used on a Pc. Steady state input and output files and calibrated heads are available on disk. Input, output, and heads are available on disk for the SIMBASE simulation. It may be difficult to obtain input and results for the other simulations on disk or as printout. 4.4 Schenk's Denver Basin Model The modeling work by Banta was used as the basis for a modeling project by 1. Schenk at the Colorado School of Mines. Banta's model was converted for use with the MODFLOW code and used in simulation of interactions between the bedrock aquifers and surface streams (Schenk, J. and E. Poeter, 1990, RIVINT, An Improved Code for Simulating Surface/Groundwater Interactions with MODFLOW). The goal of this project was development of an alternate 8 HRS WATER CONSULTANTS, INC