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http://dx.doi.org/10.3741/JKWRA.2019.52.9.637

Water yield estimation of the Bagmati basin of Nepal using GIS based InVEST model  

Bastola, Shiksha (Department of Disaster Prevention and Environmental Engineering, Kyungpook National University)
Seong, Yeon Jeong (Department of Disaster Prevention and Environmental Engineering, Kyungpook National University)
Lee, Sang Hyup (Department of Disaster Prevention and Environmental Engineering, Kyungpook National University)
Jung, Younghun (Department of Disaster Prevention and Environmental Engineering, Kyungpook National University)
Publication Information
Journal of Korea Water Resources Association / v.52, no.9, 2019 , pp. 637-645 More about this Journal
Abstract
Among various ecosystem services provided by the basin, this study deals with water yield (WY) estimation in the Bagmati basin of Nepal. Maps of where water used for different facilities like water supply, irrigation, hydropower etc. are generated helps planning and management of facilities. These maps also help to avoid unintended impacts on provision and production of services. Several studies have focused on the provision of ecosystem services (ES) on the basin. Most of the studies have are primarily focused on carbon storage and drinking water supply. Meanwhile, none of the studies has specifically highlighted water yield distribution on sub-basin scale and as per land use types in the Bagmati basin of Nepal. Thus, this study was originated with an aim to compute the total WY of the basin along with computation on a sub-basin scale and to study the WY capacity of different landuse types of the basin. For the study, InVEST water yield model, a popular model for ecosystem service assessment based on Budyko hydrological method is used along with ArcGIS. The result shows water yield per hectare is highest on sub-basin 5 ($15216.32m^3/ha$) and lowest on sub-basin 6 ($10847.15m^3/ha$). Likewise, built-up landuse has highest WY capacity followed by grassland and agricultural area. The sub-basin wise and LULC specific WY estimations are expected to provide scenarios for development of interrelated services on local scales. Also, these estimations are expected to promote sustainable land use policies and interrelated water management services.
Keywords
Ecosystem service; Water yield; Landuse; InVEST; Planning and management;
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