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Research ArticleRESEARCH SECTION

Groundwater trends during 1985 to 2019 in a critical groundwater area of northeastern Arkansas

D.L. Leslie, M.L. Reba, I.A. Godwin and M.A. Yaeger
Journal of Soil and Water Conservation January 2022, 77 (1) 67-77; DOI: https://doi.org/10.2489/jswc.2022.00170
D.L. Leslie
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M.L. Reba
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I.A. Godwin
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M.A. Yaeger
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Abstract

The Mississippi River Valley alluvial aquifer provides over 90% of irrigation water for agriculture in the Lower Mississippi River Basin. Overexploitation of the alluvial aquifer in the Cache River Critical Groundwater Area (CRCGA) in Arkansas started impacting crop production in the 2000s with previous historical data identifying sustained groundwater declines. Groundwater depletion resulted in many producers investing in on-farm reservoir-tailwater recovery systems to provide a more secure irrigation source. More focused and consistent water level measurements were necessary to identify any groundwater level changes. Groundwater trends focused on the CRCGA cone of depression were compared from two-time groupings: 1985 to 2012 and 2012 to 2019. On-farm reservoirs in the CRCGA were inventoried in 2015, and 90% of those inventoried were constructed by 2012. More frequent groundwater level data collection in the CRCGA started in 2012 as well. Groundwater levels during 1985 to 2012 had consistent decline rates of –0.17 to –0.44 m y–1. Groundwater levels during 2012 to 2019 varied with decline rates of ≤–0.10 to ≤–0.50 m y–1, but also areas of no significant change and recovery at rates of ≤0 to ≤0.25 m y–1. Trend differences between the two periods showed improved water level trends for most of the study area, with rates ranging ≤–0.30 to ≤0.50 m y–1. The measured improvements were attributed to less pumping due to greater precipitation and the use of surface water irrigation from 60 on-farm reservoir-tailwater recovery systems. Detection of these improvements is crucial to understanding the response and status of the alluvial aquifer within the agricultural area of the CRCGA. It is recommended that adding continuous groundwater monitoring stations in west Craighead and Poinsett counties would be beneficial to inform the status of the cone of depression, considering the importance of protecting the main agricultural irrigation supply for the state. If warmer temperatures occur in the future, higher temporal and spatial groundwater level data in the CRCGA will allow policymakers and water resource managers to make timely groundwater management decisions to ensure its supply for future generations.

Key words
  • alluvial aquifer
  • groundwater conservation
  • on-farm reservoirs
  • © 2022 by the Soil and Water Conservation Society
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Journal of Soil and Water Conservation: 77 (1)
Journal of Soil and Water Conservation
Vol. 77, Issue 1
January/February 2022
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Groundwater trends during 1985 to 2019 in a critical groundwater area of northeastern Arkansas
D.L. Leslie, M.L. Reba, I.A. Godwin, M.A. Yaeger
Journal of Soil and Water Conservation Jan 2022, 77 (1) 67-77; DOI: 10.2489/jswc.2022.00170

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Groundwater trends during 1985 to 2019 in a critical groundwater area of northeastern Arkansas
D.L. Leslie, M.L. Reba, I.A. Godwin, M.A. Yaeger
Journal of Soil and Water Conservation Jan 2022, 77 (1) 67-77; DOI: 10.2489/jswc.2022.00170
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Keywords

  • alluvial aquifer
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