Two microwatersheds namely Arnigad and Bansigad near Mussoorie, equipped with hydrometeorological instruments were selected to monitor the impact of forest cover on stream discharge. Arnigad microwatershed is having dense forest cover and Bansigad is with degraded forest.

Gaumukh is the snout of the Gangotri glacier located at an altitude of 4000 m in the Himalayas from where the snow and glacier-fed Bhagirathi River emerges.