Springs of Pasighat, a valuable resource for the community: A hydrogeological study carried out using geoelectrical resistivity technique

Abstract

Many springs occur in and around Pasighat. Eight major springs of the area were considered for the study. These springs are Dimple type, Fault dam type, and a combination of Fault dam and Border type. The highest discharge is 263.23 L/sec and the lowest is 1.91 L/sec. The aquifers are terrace deposits that comprise of unsorted boulders, cobbles and pebbles in sandy matrix and the springs occur at the base of different terrace levels. Due to the scarcity of dug wells or deep tube wells, subsurface investigations were done using vertical electric sounding (VES). VES data generated at six locations show H-type situation. The aquifers are at shallow depth, unconfined, and have good hydrogeological prospects. At the T2 terrace, volume of water stored is 42,14,512.5 m3 and the combined discharge of springs is 38,257.92 m3/day. These springs are recharged by precipitation and influent streams. Springs of the study area are aligned along the Himalayan Frontal Thrust (HFT) and its splays, and they have a major role in the evolution of these springs. The springs were formed due to topographic breaks and less permeable collapsed debris. Local people use spring water for the household, irrigation, laundry, and fisheries.

Research highlights

  1. (i)

    Springs present along the base of the terraces have the highest discharge of 263.23 L/sec.

  2. (ii)

    These springs are genetically related to HFT.

  3. (iii)

    Terrace aquifers are suitable for groundwater development and groundwater flows from influent streams and foothill regions towards Siang River.

  4. (iv)

    Spring water is used by local people for household, irrigation, laundry, and fisheries and proper management of these springs will ensure good supply of water in future.

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Acknowledgements

The authors gratefully acknowledge the HOD, Department of Applied Geology, Dibrugarh University for allowing us to avail all the requisite facilities during this study. The authors also acknowledge Dr S K Lahiri, Department of Applied Geology, Dibrugarh University, for his valuable comments and suggestions during this study.

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Authors

Contributions

M Rajkonwar, B Dihingia, U Goswami and D Bezbaruah: Conception and design of study, acquisition of data, analysis and/or interpretation of data, drafting the manuscript, and revising the manuscript critically for important intellectual content.

Corresponding author

Correspondence to Monjil Rajkonwar.

Additional information

Communicated by Abhijit Mukherjee

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Rajkonwar, M., Dihingia, B., Goswami, U. et al. Springs of Pasighat, a valuable resource for the community: A hydrogeological study carried out using geoelectrical resistivity technique. J Earth Syst Sci 130, 24 (2021). https://doi.org/10.1007/s12040-020-01534-6

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Keywords

  • Hydrogeology
  • springs
  • vertical electric sounding (VES)
  • Himalayan Frontal Thrust (HFT)
  • Pasighat