Effects of Increased Land Use Changes on Runoff and Sediment Yield in the Upper River Nzoia Catchment

Overview
Cite Work

Abstract

River Nzoia originates from three water towers namely Nandi hills, Cherengany Hills and Mount Elgon. With increased anthropogenic activities in Nzoia river catchments, land cover has continuously been altered. This scenario has resulted into increased quantity of physical parameters in runoff among them, sediment load and turbidity, during rainy season. This study modelled effects of increased land use changes on runoff and sediment loads. Digital Elevation Model, spatial soil data, sediment loads and meteorological data for the year 2000 to 2012 were the main input into the Soil Water Assessment Tool (SWAT 2012) model for calibration and validation. Data from 1990 to 2014 was as well collected for comparison purposes. Arc GIS 10.1 was used for spatial data analysis. Supervised Land classes were processed from satellite images for the year 2000 and 2010 using ENVI 4.7 software. The upper river catchment had an area of 10, 859km2 compared to 12,904km2 for entire watershed, has 27 catchments, and 36 Hydrologic Response Units. The sediment load during period of study went as high as 3767.9 tons/months in the projected year 2030 compared to 1400.79tons /month in the year 1990. The study also revealed that 51% of rainfall received converted to surface runoff in the year 2014 compared to 44% as at the year 2000 implying reduction in base flow and

Read Download

Effects of Increased Land Use Changes on Runoff and Sediment Yield in the Upper River Nzoia Catchment

Related Works