Preliminary hydrological investigations for Deepar Beel and strategies for its monitoring and management - A research report by National Institute of Hydrology

The study presents a preliminary hydrological investigation of the Deepar Beel, a natural freshwater lake near Guwahati, and notes the theoretical aspects of the techniques to be used.

The study presents a preliminary hydrological investigation of the Deepar Beel, a natural freshwater lake near Guwahati, and notes the theoretical aspects of the techniques to be used, methodologies and instruments for conducting a detailed study of the natural processes at hand.

Deepar Beel acts as a natural stormwater reservoir during monsoon period and is greatly influenced by the rapid urbanization and improper land use pattern of Guwahati. It receives a large portion of sewage of the city, but the preliminary investigations reveal that the Beel is largely free from significant levels of pollution. This is due to the dilution effects of large storm water runoff during monsoons as also the release of the Beel water to river Brahmaputra through the Khanajun outlet. Yet, the soil quality is found to have deteriorated to a large extent.

Various parameters of soil and water quality indicate that the process of eutrophication is in progress in this wetland. Although many trace elements are present in the Beel sediments, no known toxic effects are observed on aquatic life. Increasing sedimentation and reduction in lake water capacity and inflow are also observed.

A detailed investigation on hydrology & hydraulics, water balance, hydrodynamics & thermodynamics, sedimentation and biological activity in the lake is necessary. This would entail the use of nuclear techniques, remote sensing techniques, advanced instrumentations using data acquisition system and sophisticated portable equipments for water quality testing. The conventional techniques could also be used to study sedimentation rate and other parameters. 

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