A STUDY ON THE LIMNOLOGICAL PARAMETERS OF GANGA LAKE (GYAKAR SINYIK) OF ITANAGAR, ARUNACHAL PRADESH

Abstract

This study has been conducted to assess the seasonal variation in lake water quality parameters and overall performance of Ganga lake (Gyakar Sinyik in local dialect). It lies in the western part of Itanagar, 6 km away from Ganga market. The lake is surrounded by small hills from either side covered with thick forest. The need of investigation is to protect the natural water body from various kinds of threats to its pristine condition. It is found that the western bank of the lake is weaken due to geological relief soil and anthropogenic activities like earth-cutting, deforestation, etc. It is found that the project site is rich in biodiversity and has significant socio-economic value. Upper portion of the upland hills are flatty in slope and huge boulders can be seen sparsely all over the site. This study has emphasized on the hydrological parameters which determines the quality of the lake water. Some parameter like dissolved oxygen, temperature, pH, turbidity, total dissolved Solid, chlorides, nitrate, conductivity, chemical oxygen demand, biological oxygen demand, total alkalinity, total hardness of the water sample are studied to understand the quality of the lake water. Outcomes of the test conducted reveal the lake is suitable for aquatic life, but some concentration of nitrate, chlorine, turbidity and alkalinity were also reported.