Hydro-geographical Study on the Water Environment in Nepal （1）

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  • ネパールの水環境に関する水文地理学的研究（1）

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Abstract

We conducted hydro-geogragraphical studies on the overall water environment, centering on the Kathmandu Valley （Bamgati River basin）, Nepal, where remarkable urbanization and population concentration are progressing. In particular, as a joint research with the microbiology laboratory of the local university （Tribhuvan University）, at the same time as clarifying the anthropogenic effects on the target basin of urbanization and surrounding field use and the water environment characteristics in this basin, We conducted a preliminary survey to proceed with research on the relationship between microorganisms contained in rivers and dissolved chemical components. As a result of this study, it was clarified that the water quality in the Kathmandu Valley varies greatly among the tributaries of the Bakumati River, and the tributary with the highest EC （Electrical Conductivity） and DOC （Dissolved organic carbon） is the Bishumati River, which is densely populated with houses. The lowest tributary in the basin was the Manohara River basin, where agricultural land spreads, and the difference in water quality between rivers was clearly seen. High concentrations of ammonia （NH_4^+） and nitrite （NO_2^-） were detected in many rivers, highlighting the inadequacies of wastewater treatment facilities, but comprehensive measures such as dust scattered on rivers and roads, traffic congestion, and air pollution. The need for environmental measures has also become clear.

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