Mapping Water Resources and Potential Recharge Zones: A Watershed-Based Study of Tarilum Watershed, Drujaygang, Dagana Dzongkhag

Abstract

This study assessed the ecological integrity and functionality of the Tarilum watershed using a watershed-based approach.  Due to the lack of alternative watersheds nearby, this watershed is critical for sustaining the gewog’s water requirements, both for drinking and irrigation. The assessment, carried out using the 2016 watershed classification guidelines, GIS, and hydrogeological studies, categorized this watershed as ‘Degraded category’, primarily due to environmental stressors such as soil erosion, infrastructure development, and unsustainable land use practices. The study further identified such problems as porous and disturbed recharge zones and steep slopes in the watershed’s upper regions that require immediate management interventions. The results indicate a necessity for strategic land-use planning and implementation of erosion control measures to safeguard groundwater recharge and maintain water availability. Recommended management strategies include afforestation, sustainable land management, and recharge zone protection interventions. Adopting these strategies is anticipated to significantly enhance the watershed’s resilience, ensuring sustainable water availability and long-term ecological health.