PRESENCE OF ALGAE AND DISSOLVED OXYGEN PRODUCTION IN HILLY STREAMS - A CASE STUDYM.R. SHARMA' AND A.B. GUPTAAbstract Himalayas are the cradle of a large number of streams and mighty rivers, which ensure all the year round availability of water. Hathli is one of such streams in outer Himalayas. It is a sub-tributary of river and as. It is getting polluted due to wastewater of Hamirpur town in Himachal Pradesh, India. The pollution impact is severest in the low flow months of summer. Steep slopes, pools, riffles, shallow depth and small waterfalls are the main characteristics of the stream. The streambed consists of stones and cobbles. All the stones in the streambed are beavlly coated with a greenish layer of algae. Greenish filamentous attached algae also grow in abundance in the stream. Some aquatic plants have also been observed in the stream. The paper describes the quantification of Oxygen production due to the presence of attached algae in the stream.
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