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I I. I I I I I I I Ie I I I I I I I. I I Simulations were performed for a history-matching period from 1958 to 1978 and a prediction period from 1979 to 2050. Predicted groundwater levels were calculated under several water demand conditions: 1. FULL - Pumping based on projected water supply requirements for the Denver Metro area 2. HALF - One-half ofthe FULL pumping rates 3. STDY - pumping is assumed to be remain constant after 1983, the most conservative estimate. The methods used in this modeling effort are appropriate for determining the regional groundwater level declines in each aquifer as a result of pumping. The model calculates groundwater levels in response to the major physical processes controlling groundwater flow in the basin. The model grid setup is rather coarse with large model cells, making it difficult to get results for specific well sites. We have contacted Mr. Robson concerning availability of the model setup and results. Printouts of the results from the various simulations discussed in the report exist and could be used to pick groundwater levels at various sites for further analysis. The exact model code used for the simulations may be available only on printout. Since codes changes may have been made in this model it may be difficult to rerun it to produce additional results for different pumping scenanos. 4.3 Banta's Denver Basin Model The analyses performed by Robson formed the basis for later work by E. R. Banta (Banta, E. R., 1989, Hydrologic Effects of Pumpage From the Denver basin Bedrock Aquifers of Northern EI Paso County, Colorado, U.S.G.S. Water Resources Investigation Report 88-4033). The Trescott-Larson model was also used in this project, and the basic setup is quite similar to that used by Robson, though the finite difference grid has been revised in much of the modeled 7 HRS W ATERCONSULTANTS, INc.