MODIFICATION DESIGN OF RIVER CAPACITY AS FLOOD MITIGATION STRATEGY IN THE KAFIN HAUSA FLOOD PLAIN AREA, JIGAWA STATE-NIGERIA
Publication Date : 01/02/2018
Floods occur repeatedly in Kafin Hausa flood plain areas and they cause tremendous losses in terms of property and life. The study was carried out to determine the causes, effect and suggest measures in tackling such disaster. In-situ methods were used in carrying out some of the tests mainly infiltration and ground water fluctuation test. Rainfall and Dam discharge data were collected; GPS, GIS, and Google earth application/software were used to locate, delineate and determine hydrological features of the study area. The soil have low water infiltration rates of approximately 72.1 mm/hr, 59.1 mm/hr, 48.47 mm/hr, and 37.7 mm/hr, for sand, silt- loam, sandy-loam, and clay-loam soil respectively. A shallow ground water level of minimum and maximum value of 8.03 m and 10.30 m respectively, with an estimated fluctuation value ranges between 0.15m - 0.02m. Twenty (20) years Return Period was used to estimate the generated runoff over the study area (16.225 km2) to be 1,587.205 m3/s. The river geometry was modified to have a capacity of 3,986.890 m3/s which highly exceeds initial river capacity of 2,087.286 m3/s. It is recommended that the present river dimension be dredged to the new dimensions which will accommodate any future floods.
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