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Santa Cruz Regional Model

Santa Cruz Model History and Timeline

The Santa Cruz MODFLOW model development began in the late 1990's. Prior to the late 1990's, Anderson (1972) developed an electric analog model for the region. Additional modeling efforts were conducted by Travers and Mock (1984) and Hanson and Benedict (1994). Beginning in 1997 the ADWR initiated a field monitoring program providing the data necessary for the ADWR conceptual model design and model calibration.

In the mid-2000's the ADWR developed two most recent models for the basin; the North Santa Cruz Model and Microbasins Model, simulating conditions south of the Nogales International Wastewater Treatment Plant (NIWTP). The ADWR is currently using the models to evaluate the basin. In the future an ensemble of stream-aquifer boundary conditions will be available for use in the Santa Cruz AMA groundwater flow models to assess future stream recharge uncertainty. Together with the groundwater flow models, the streamflow realizations will allow water resource managers to evaluate risks associated with long-term water resource planning, i.e., future groundwater levels and groundwater discharge conditions based on different rates of projected pumping.

Santa Cruz Model Location

Santa Cruz Model Location within Phoenix

 

The Santa Cruz model (North Santa Cruz and Microbasins) encompasses approximately 343 square miles. [2.6 MB pdf] Adobe File

Santa Cruz Model Datasets

  • Model Files Referenced in ADWR Modeling Report No. 14
    • 1997 to 2002 ADWR Calibrated Steady-State Santa Cruz North MODFLOW Datasets [101KB zip]
    • 1997 to 2002 ADWR Calibrated Transient Santa Cruz North MODFLOW Datasets [463KB zip]
  • Model Files Referenced in ADWR Modeling Report No. 15
    • 1997 to 2002 ADWR Calibrated Transient Santa Cruz Microbasins MODFLOW Datasets [1.8MB zip]

Santa Cruz Model Reports and Documents

  • Groundwater Flow Model of the Santa Cruz Active Management Area Along the Effluent-Dominated Santa Cruz River, Santa Cruz and Pima Counties. Keith Nelson. Modeling Report No. 14 (March, 2007) [5.3MB pdf] Adobe File
  • Groundwater Flow Model of the Santa Cruz Active Management Area Microbasins International Boundary to Nogales International Wastewater Treatment Plant, Santa Cruz County, Arizona. Gretchen Erwin. Modeling Report No. 15 (2007) [105MB pdf] Adobe File
  • Analysis of Historic Water Level Data Related to Proposed Assured Water Supply Physical Availability Criteria for the Santa Cruz Active Management Area, Santa Cruz and Pima Counties, Arizona. Corkhill and Dubas. Modeling Report No.18 (2007) [1.1MB pdf] Adobe File
  • Risk Analysis of Pumping Impacts on Simulated Groundwater Flow in the Santa Cruz Active Management Area. Keith Nelson. Modeling Report No. 21 (May, 2010) [47MB pdf] Acrobat Icon PDFs

Reports of Interest (not produced by ADWR)

  • Hydrologic Model Framework for Water Resources Planning in the Santa-Cruz River, Southern Arizona. (HRC report) by Eylon Shamir and others. Hydrologic Research Center (2007). [650 KB pdf] Acrobat Icon PDFs

This report describes the development of a stochastic streamflow model (HRC model) for the upper Santa Cruz River. The HRC model provides 100 independent streamflow realizations (monthly intervals), where each realization consists of 100 years. Monthly streamflow rates from the HRC model are converted to stream-aquifer boundary conditions for use in groundwater flow models. Combining the HRC model with the Santa Cruz AMA groundwater flow models enables different water management strategies to be evaluated in a rigorous and objective manner.

 


Questions?

                                                              

      Contact the ADWR Modeling Unit ([email protected] )

 





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