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    Author(s): Xiaojing Ni; Prem B. Parajuli; Ying Ouyang
    Date: 2020
    Source: Water Resources Management
    Publication Series: Scientific Journal (JRNL)
    Station: Southern Research Station
    PDF: Download Publication  (1.0 MB)

    Description

    Over the last several decades, increased groundwater usage by agriculture with a consequence
    of groundwater resource depletion has motivated the discussion of sustainability
    of groundwater resource. In this study, to investigate the impacts of agricultural best
    management practices (BMPs) on groundwater level, two kinds of conservation practices
    and five scenarios of tail water recovery pond and crop rotation were simulated by various
    groundwater recharge and pumping plans in Soil and Water Assessment Tool (SWAT)
    and MODFLOW models in an agriculture watershed in Mississippi, U.S.. The calibrated
    and validated ground water model indicated coefficient of determination (R2) of 0.81 and
    Nash–Sutcliffe model efficiency coefficient (NSE) of 0.79 respectively. The results from
    this study showed that the groundwater recharge changed with irrigation plans and
    surface hydrological impact of management practices. In addition, it determined that tail
    water recovery pond could help mitigate groundwater depletion. The groundwater recharge
    due to continuous corn crop scenario was 7% higher in average than that of the
    continuous soybean. Non-growing season groundwater recharge may be critical for
    groundwater recovery. The average groundwater level was increased continuous corn
    scenario by 15%, continuous soybean by 13%, and corn-soybean by 14% as compare to
    the baseline scenario with rice planted. Results of this study can be helpful for planning
    on how various BMPs impact on groundwater.

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    Citation

    Ni, Xiaojing; Parajuli, Prem B.; Ouyang, Ying. 2020. Assessing agriculture conservation practice impacts on groundwater levels at watershed scale. Water Resources Management. 34(4): 1553-1566. https://doi.org/10.1007/s11269-020-02526-3.

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    Keywords

    BMPs, Groundwater, MODFLOW, SWAT, Tail water recovery pond

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