Coupling agricultural non-point source (AgNPS) model and geographic information system (GIS) tools to predict peak runoff and sediment generation in the upper River Njoro catchment in Kenya

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dc.contributor.author Otieno, Hesbon
dc.contributor.author Onyando, Japheth O.
dc.date.accessioned 2015-11-04T06:33:00Z
dc.date.available 2015-11-04T06:33:00Z
dc.date.issued 2012
dc.identifier.citation International Journal of Water Resources and Environmental Engineering Vol. 4(12), pp. 397-403 en_US
dc.identifier.issn 1991-637X
dc.identifier.uri http://www.researchgate.net/profile/Hesbon_Otieno/publication/236022568_Coupling_agricultural_non-point_source_(AgNPS)_model_and_geographic_information_system_(GIS)_tools_to_predict_peak_runoff_and_sediment_generation_in_the_upper_River_Njoro_catchment_in_Kenya/links/00463515d4f8d22817000000.pdf
dc.identifier.uri http://repository.seku.ac.ke/handle/123456789/1826
dc.description DOI: 10.5897/IJWREE12.086 en_US
dc.description.abstract Human interference in the upper River Njoro catchment has led to the increased exposure of the land to accelerated erosion. An application that combined the capabilities of remote sensing, geographic information system (GIS) and agricultural non-point source (AgNPS) model was used to estimate peak runoff rate and sediment yield from the upper River Njoro catchment. Remotely sensed Landsat Thematic Mapper (TM) images were used to obtain land cover and associated AgNPS model input parameters. Other input parameters for the model were extracted from GIS layers using the agricultural non-point source-integrated land and water information system (AgNPS-ILWIS) interface. Surface water quantity and quality data including peak runoff and sediment yield of selected storm events were obtained from two gauging stations, within the catchment. Base flow separation was done so that measured direct peak runoff rate and sediment yield generated by direct runoff could be determined and compared directly with the model simulated results. Simulated peak runoff rates in Upstream (Treetop) station were satisfactory with an EFF of 0.78 and a percent error of 4.1%. The sediment yield was also reasonably estimated with an EFF of 0.88 and a 2% error. The downstream (Egerton) station results were also satisfactorily predicted with peak runoff rate having an EFF of 0.69 and a 5.5% error of estimates, while the estimated sediment yield had an EFF of 0.86 and a 2.5% error. en_US
dc.language.iso en en_US
dc.subject Peak runoff en_US
dc.subject sediment en_US
dc.subject agricultural non-point source (AgNPS) en_US
dc.subject geographic information system (GIS) en_US
dc.subject integrated land and water information system (ILWIS) en_US
dc.subject soil loss en_US
dc.title Coupling agricultural non-point source (AgNPS) model and geographic information system (GIS) tools to predict peak runoff and sediment generation in the upper River Njoro catchment in Kenya en_US
dc.type Article en_US


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