Research Article Integrated Geophysical and Geotechnical Approaches for Evaluating Dam Seepage in Lesser Himalayan Region of Pakistan Umair Bin Nisar, 1 Muhammad Farooq, 2 Sarfraz Khan , 3 Ramesh Raj Pant , 4 Iftikhar A. Satti, 5 Ali Wahid , 2 Faizan ur Rehman Qaiser , 6 Syed Amjad Ali Bukhari, 6 and Furqan Mahmud Butt 1 1 Department of Meteorology, COMSATS University Islamabad, Park Road, Tarlai Kalan, 45550 Islamabad, Pakistan 2 Institute of Geology, University of Azad Jammu and Kashmir, Muzaffarabad, Azad Kashmir, Pakistan 3 National Centre for Excellence in Geology, University of Peshawar, 25130 KP, Pakistan 4 Central Department of Environmental Science, Tribhuvan University, Nepal 5 Ayed Eid Al Osaimi Engineering Consulting Office, Al-Khobar, Saudi Arabia 6 Department of Earth Sciences, COMSATS University Islamabad, Abbottabad Campus, Tobe Camp, Mandian, Abbottabad, KP, Pakistan Correspondence should be addressed to Ramesh Raj Pant; rpant@cdes.edu.np Received 19 August 2022; Revised 11 January 2023; Accepted 12 January 2023; Published 28 February 2023 Academic Editor: Jianyong Han Copyright © 2023 Umair Bin Nisar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Dam leakage is a major problem in earth-filled reservoir dams. The present research is aimed at detecting the seepage zones in an earth-filled reservoir dam in the vicinity of Sarobi village, North Waziristan, Pakistan. The objective was achieved by integrating geological, geotechnical, and geophysical datasets. Geological survey was carried out in the area to identify the surface exposures. Geotechnical data involved was used to estimation of permeability and Lugeon values to identify network of joints/fractures whereas electrical resistivity tomography (ERT) technique (utilizing Wenner-Schlumberger configuration) was applied for the identification of the leakage zones. Geological data revealed highly deformed alluvium towards the right abutment underlain by compressed shale and highly fractured limestone beds. Geotechnical data indicated high permeability, Lugeon values, and concentration of sand and gravel towards the right abutment whereas low permeability, Lugeon values, and higher concentration of silt and clay were observed towards the left abutment. ERT data identified a conductive zone embedded between impermeable lithologies having resistivity between 10 and 60 Ω·m. This conductive zone was observed in parallel profiles acquired in upstream, dam crest, and downstream parts of the dam. The integration of all the datasets revealed a network of joints that are interconnected and provide a path for water at the upstream side to pass through right abutment of dam and leak towards the downstream. 1. Introduction Pakistan is a water-stressed country; it receives approxi- mately 145 million-acre feet of water through precipitation and glacial melt, out of which it can only save 14 million- acre feet, wasting 131 million-acre feet to the sea [1, 2]. The loss is attributed to limited storage capacity/reservoirs [3]. In order to tackle the losses and support the irrigation requirement, the government of Pakistan has been focusing on achieving a “green revolution” by developing several small dams to support local agriculture [4, 5]. The majority of these small dams are earth-filled dams [6]. Earth-filled dams, among other types, are considered economical due to the composition of natural lithologies that are often available in the vicinity of the structure [7]. On the contrary, water leakage is a common problem in Hindawi Geofluids Volume 2023, Article ID 6930602, 10 pages https://doi.org/10.1155/2023/6930602