Project: Detail Study for Seepage Control Through the Rankbang Lake, Kotgaun, Rolpa

Client: Department of Water Resources and Irrigation

Year: 2025

Status: Completed

The study aimed to assess the seepage phenomenon from Rankbang Lake and develop technically sound and practical solutions for its control. The key tasks completed by GEOINFRA included:

• Literature review and analysis of the lake’s physical, geological, and hydrological settings.
• Detailed field reconnaissance and visual inspection of seepage zones and surrounding slopes.
• Execution of Electrical Resistivity Tomography (ERT) survey to identify subsurface seepage paths and weak zones.
• Collection and analysis of soil data and previous investigations conducted in the area.
• Evaluation of surface and sub-surface hydrology and lake storage dynamics.
• Identification of probable seepage mechanisms (e.g., karstic or fractured rock systems).
• Preparation of mitigation options for seepage control including curtain grouting, clay blanketing, and cut-off trench designs.
• Formulation of short- and long-term recommendations to ensure the sustainability of the lake for local irrigation and ecological services.