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Numerical simulation of ground-water flow in the Lost Creek Designated Ground Water Basin

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Numerical simulation of ground-water flow in the Lost Creek Designated Ground Water Basin, Weld and Adams Counties, Colorado

Study Area: Weld and Adams Counties, Colorado
Period of Project: 2005-2006
Project Number: BVU00
Project Chief: Rick Arnold
Cooperator: Lost Creek Ground Water Management District

BACKGROUND:

The Lost Creek Designated Ground Water Basin (LCDGWB) is an important alluvial aquifer for water supply in northeastern Colorado. Increased demand for withdrawals from the LCDGWB has led to a concern about the long-term sustainability of the basin’s ground-water resources. A numerical ground-water flow model developed using an early version of MODFLOW exists for the LCDGWB. A review and update of the existing model using new data and simulation capabilities of MODFLOW-2000 is needed to advance understanding of ground-water flow in the basin and provide information needed for planning and managing the basin’s ground-water resources.

OBJECTIVES:

The study objective is to improve understanding of ground-water flow in the Lost Creek Designated Ground Water Basin by updating the existing numerical ground-water flow model with newly available data and MODFLOW-2000 simulation capabilities. Specific tasks associated with the study objective are to:

1. Review and summarize the existing ground-water model input data.
2. Evaluate the existing model calibration, sensitivity analysis, and predictive capability and assess the need for new input data to improve model calibration.
3. Collect and compile new input data needed to improve model calibration.
4. Update the existing model with new data and recalibrate the model using MODFLOW-2000.