This paper addresses the effect of pollution on dissolved oxygen content (DO) in a Shivalik Himalayan stream during early hours of day in the summer season (May 2009-June 2010). The study showed that the dissolved oxygen in the stream is below 4 mg/L in a stretch of 2600 m and, therefore, water is not fit for public supply, bathing, wildlife and fish culture.

Hathli is sub-tributary of river Beas in outer Himalayas. It is getting polluted due to wastewater of Hamirpur town in Himachal Pradesh, India. The pollution impact is severest in the low flow months. Steep slopes, pools, riffles and small waterfalls thus characterize the stream. the streambed consists of stones and cobbles.