ANNOUNCEMENTS
The hydrology of an area is greatly influenced by changing the land-use activity which is greatly altered by human activity and have large impact on water resources. The availability of water in an area can be studied through water budget equation. The quantification of impact of land use change and management practices will help the decision makers in policy development. Swat is the interface of ArcMap 10.1 has potential in estimation of water resources. The massive land-use changes increase the surface runoff by 50% at the annual average Manjira river basin. The land use from the year 2013 and 1996 have been developed and applied in SWAT model. The agricultural land covers around 55 percent of area has shown considerable increase to 17660 km2 from 15455 km2, over the time period of 16 years. There is a decrease in barren land / area, increase in urban areas and agricultural area and forest area as well. Others hydrological parameters have been also calculated for the land-use land cover changes in the present study. Generally, decreases in surface runoff lead to route to streams ultimately less stream flow lead to drought like scenarios, therefore quantum assessment is essential for the study. The urbanization and increase in agricultural land over these 16 years is depicted in land-use maps. For the high accuracy SRTM Digital Elevation Model (DEM) with 30m of spatial resolution is used, provided by USGS earth explorer. The study addresses the runoff calculation mechanism through Curve Number distribution based on soil group and land-use. The SWAT model is run for 1996 and 2013 land use and water budget parameters have been calculated using weather data for the period of 35 years. The water resource assessment is done for the manjira river basin using SWAT model, performance of model is found good as Nash-Sutcliff Efficency value is 0.75 for the stream flow in sub-basin 3 of the total basin.
Keywords: Runoff, SWAT, GIS, Land-use, Watershed, Hydrological modelling.
