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    Flow model for the Bingham cienega area, San Pedro river basin, Arizona: a management and restoration tool

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    Author
    Ronayne, Michael James
    Maddock, Thomas, III
    Affiliation
    Department of Hydrology & Water Resources, The University of Arizona
    Issue Date
    1996-10
    Keywords
    Hydraulic measurements -- San Pedro River Watershed (Mexico and Ariz.)
    Stream measurements -- San Pedro River Watershed (Mexico and Ariz.)
    Vegetation monitoring -- San Pedro River Watershed (Mexico and Ariz.)
    Hydraulic measurements.
    Stream measurements.
    Vegetation monitoring.
    
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    Publisher
    Department of Hydrology and Water Resources, University of Arizona (Tucson, AZ)
    Rights
    Copyright © Arizona Board of Regents
    Collection Information
    This title from the Hydrology & Water Resources Technical Reports collection is made available by the Department of Hydrology & Atmospheric Sciences and the University Libraries, University of Arizona. If you have questions about titles in this collection, please contact repository@u.library.arizona.edu.
    Abstract
    A finite element groundwater flow model was used to support a hydrologic assessment for a study area in the Lower San Pedro River Basin which contains the Bingham Cienega. Consolidated sedimentary rocks associated with an extension of the Catalina Core Complex truncate the floodplain aquifer system in the study area. The elevated water table produced by this "hardrock" results in spring discharge at the cienega and a locally gaining reach of the San Pedro River. The steady -state model suggests that recharge (and discharge) components for the floodplain aquifer sum to 3.10 cfs. Mountain front recharge, underflow, and stream leakage are the primary recharge mechanisms, while stream leakage, evapotranspiration, spring flow, and underflow out are sources for groundwater discharge. A steady -oscillatory model was used to account for seasonal periodicity in the system's boundary conditions. Monthly variation in the evapotranspiration rate was offset primarily by storage changes in the aquifer. Due to a lack of measured hydrologic data within the study area, results from the model simulations are only preliminary. Model development and the subsequent sensitivity analyses have provided insight into what type of data needs to be collected. Head measurements are most needed in the area just downstream from Bingham Cienega. The mountain front recharge and evapotranspiration rates are shown to be highly sensitive parameters in the model; improved estimation of these values would be helpful. Spring discharge would be a valuable calibration tool if it could be accurately measured. A more extensive record of stream baseflow in the San Pedro River should be established. After more hydrologic data is collected, the model could be recalibrated so as to better represent the system. Eventually, this tool may be used in direct support of management and/or restoration decisions.
    Series/Report no.
    Technical Reports on Hydrology and Water Resources, No. 96-050
    Sponsors
    Research and development for this project was funded in part by the Arizona Chapter of The Nature Conservancy. The views and conclusions reported are those of the author and are not necessarily shared by The Nature Conservancy. We would like to give special thanks to Robert Mac Nish, Kate Baird and Kevin Lansey for their thoughtful comments on this document.
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