Temporal changes in the configuration of the water table in the vicinity of the management systems evaluation area site, central Nebraska

Kilpatrick, John M.

doi:10.3133/wri944173

1996

DOI: 10.3133/wri944173

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Temporal changes in the configuration of the water table in the vicinity of the management systems evaluation area site, central Nebraska

John M. Kilpatrick¹

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2011

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Modeling the effects of agricultural management practices on groundwater in Shelton, USA

Arumí¹,

Martin

Watts

2011

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An integrated methodology was developed to assess the impact of recharge rates, nitrate leaching from crop root zones, and irrigation pumping rates on groundwater quality and quantity. Monthly values for deep percolation of water, irrigation pumping and leaching of nitrate-nitrogen were calculated with a soilwater-plant model. An Intermediate Vadose Zone Model (IVZM) was developed and used together with models for groundwater flow (MODFLOW) and solute transport (MT3D) to simulate the movement of water and nitrate-nitrogen. The IVZM generates recharge files used by MODFLOW and MT3D. The methodology was applied to an area near the town of Shelton, Nebraska, where a shallow sand-gravel aquifer is highly contaminated by nitrate-nitrogen. MODFLOW was calibrated using historic groundwater level data from 1981 to 1996. Simulation results suggest that concentration reductions of 10% in the upper third of the saturated zone are possible after 10 years of improved irrigation and nitrogen fertilizer management. Groundwater quality changes slowly propagate down-gradient from the field and towards the lower part of the aquifer. A particle tracking technique showed that water from a well does not provide a good indication of the influence of improved management in the adjacent field. The quality of water pumped from a well represents the effect of management over 15 years and from more than 1.5 km up-gradient from the well. Regional groundwater quality depends on local management practices over a long period. Regulatory programs to improve water quality require therefore, widespread adoption and substantial time to provide significant water quality improvements.

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Modeling the effects of agricultural management practices on groundwater in Shelton, USA

Arumí¹,

Martin

Watts

2011

Obras y Proyectos

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show abstract

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Temporal changes in the configuration of the water table in the vicinity of the management systems evaluation area site, central Nebraska

Cited by 1 publication

References 0 publications

Modeling the effects of agricultural management practices on groundwater in Shelton, USA

Modeling the effects of agricultural management practices on groundwater in Shelton, USA

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