Dhankuta, March 22 -- For the past three years, municipal police from Dharan Sub-Metropolitan City have been maintaining continuous surveillance to protect the catchment area along the Bhedetar-Dharan section of the Koshi Highway.

The deployment began in 2022 following a rise in cases of passengers and drivers urinating and defecating along the roadside, which led to the pollution of local water sources.

Authorities have placed particular emphasis on the Nishane Khola and Sardu catchment areas in Dharan-4. These watersheds, originating from the Bhedetar hills in Dhankuta, serve as the primary sources of drinking water for Dharan.

The system also includes water flowing from the Chiuribas, Suryodaya Buddha Bihar and Sanguri Bhanjyang are...