Abstract
The 2017 Dadin Kowa flood had a more devastating effect in Hore Gare and Tunga areas. The flood occurred as a result of high rainfall, obstruction, siltation and encroachment into flood-prone areas. Monthly maximum and annual rainfall analyses were carried out. The month of June, 2017 received the maximum monthly rainfall of a total of 344 mm which coincided with the month the flood occurred. The analysis of data indicated that flooding in Dadin Kowa town is rainfall-induced and the river channels are expected to be on higher risks of flooding when the channel obstruction capacity coincides with high rainfall intensity. The mean value of annual and maximum rainfall is 834.93 mm and 249.08 mm with standard deviation of 131.95 mm and 49.24 mm respectively at Dadin Kowa town. The recurrence interval of 2, 5, 10, 25, 50, 100 and 200 years of monthly maximum rainfall is 250.70 mm, 292.80 mm, 313.00 mm, 332.70 mm, 344.30 mm, 353.90 mm and 362.00 mm respectively. The frequency analysis of the return period of the maximum monthly rainfall of 344.00 mm is expected to occur in 50 years from 2018 with a magnitude of 344.30 mm. Also, the recurrence interval of 2, 5, 10, 25, 50, 100 and 200 years of annual maximum rainfall is 838.78 mm, 949.40 mm, 1003.60 mm, 1057.70 mm, 1090.30 mm, 1118.10 mm and 1142.10 mm respectively. The frequency analysis of the return period of the
Highlights
Nigeria and other countries are faced with environmental and ecological challenges because of the impact of climate change
On the 6th of June, 2017, the amount of rainfall measured in Dadin Kowa by the authority was 136 mm, the water level was 239.161 m, the Inflow into the reservoir was 187 m/s3, the total discharge was at 13.8 m/s3 and the volume of the reservoir was FUDMA Journal of Sciences (FJS) Vol 4 No 3, September, 2020, pp 215 - 223
The frequency factor K is a function of the skewness rainfall effect in the catchment were carried out especially to coefficient and return period and can be found using the determine the causes of flood on the 7th of June, 2017
Summary
Nigeria and other countries are faced with environmental and ecological challenges because of the impact of climate change.
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