ASSESSMENT OF THE 2012 FLOODING IN MARARABA KARU LOCAL GOVERNMENT AREA OF NASARAWA STATE, NIGERIA

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dc.contributor.authorEigege, NICHOLAS Jacob
dc.date.accessioned2015-06-11T08:32:57Z
dc.date.available2015-06-11T08:32:57Z
dc.date.issued2014-11
dc.description.abstractFlooding due to extreme rain events in urban environments is a problem and a growing concern. Urban flooding has become more frequent due to a number of factors including climate change with the different patterns of precipitation, urban growth and an increase in paved surfaces. Recent flood disasters in Mararaba sub-urban area has claimed some lives, damaged properties and threatened the socio economic live of residents. It has therefore become important to create easily read, rapidly accessible flood hazard map, which will prioritize the mitigation effects. The aim of this study is to assess the 2012 flooding in Mararaba sub-urban area and also identify parts of the study areas that are prone to flooding using GIS based tool. LULC map was prepared using Remote sensing technique of visual interpretation to identify eight classes of land use land cover from the 2005 Spot 5 satellite imagery in a GIS environment. Soil Conservation Service (SCS) model was used to determine the rainfall-runoff relationship of the study in ILWIS environment. Daily rainfall data, SPOT 5 satellite Imagery (5m resolution), Digital Elevation Model (DEM) and soil texture maps were used as input for the runoff modeling. The blind weight method was used in this study to create flood hazard map for the study area. The result from this study shows an estimated total rainfall runoff of Mararaba urban watersheds calculated for the rainy season (April to October, 2012) aggregating 831.24mm. About 52 percent of total rainfall was converted into surface runoff. Month-wise runoff contribution ranges between 3% to 21%.The peak runoff estimates was 174.21mm in the Month of July which substantiates the reported flood incident on the 14 July, 2012. Five flood hazard classes were identified: Very Low, Low, Moderate, High and Very High hazards. The study demonstrated the potentials of SCS (CN) Model / GIS applications in flood hazard mapping. Concerted efforts should be made by the local and state government, urban planning and environment control department towards containing flood hazards by the construction of new drainage channels along inlands streets in Mararaba sub-urban areas where drainages have been absent. Existing ones also be expanded to increase their capacity for detaining and conveying high stream flow especially in areas at high risk.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/6636
dc.language.isoenen_US
dc.subjectASSESSMENT OF THE 2012 FLOODINGen_US
dc.subjectASSESSMENT OF THE 2012 FLOODINGen_US
dc.titleASSESSMENT OF THE 2012 FLOODING IN MARARABA KARU LOCAL GOVERNMENT AREA OF NASARAWA STATE, NIGERIAen_US
dc.typeThesisen_US
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