Tasks: Water supply study, Groundwater flow modeling
Project Description: Hydrogeologic studies and groundwater numerical modeling were conducted in support of the City of Prescott’s acquisition of the Big Chino Water Ranch and the withdrawal of groundwater under A.R.S. 45-555. Study focused on the hydrogeology of the Big Chino Ranch and Upper Big Chino sub-basin and the movement of groundwater into, through, and out of this area. The study included the following major tasks:
Compilation and review of previous studies & available hydrogeologic data
Aquifer characterization, including the drilling and logging of three deep exploration boreholes, sampling of three Big Chino Ranch wells and development of a hydrogeologic conceptual model
Development of a 3-dimensional, 7-layer groundwater flow model of the Upper Big Chino sub-basin,
Presentation of results to numerous stakeholders and public agencies, and
Preparation of report
Due to the controversial nature of the planned groundwater withdrawals, the study and groundwater model were subjected to extensive review by ADWR. Following this review the analysis and model were approved by ADWR. On appeal, the model and analysis were upheld.