ANALYSIS OF FLOOD RISK AND VULNERABILITY IN KANO METROPOLIS, KANO STATE, NIGERIA
ANALYSIS OF FLOOD RISK AND VULNERABILITY IN KANO METROPOLIS, KANO STATE, NIGERIA
No Thumbnail Available
Date
2018-08
Authors
MUKHTAR, Ibrahim
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Flooding has been a major threat to human life and properties in Kano metropolis in recent years, but information on the drainage pattern, response of the changing drainage basin to rainfall events, level of vulnerability and risk on a sub-drainage basin level which are fundamental to tackling flooding incidences are scanty. This study analyses flood risk and vulnerability within sub-basin in Kano metropolis. This was achieved through assessing the responses of different land uses and land cover to rainfall events and the changing social, economical, environmental and physical indicators.The study looked at the change in land use land cover (LULC) from 2001 to 2035 and thereby assessed the response of this different land covers to rainfall event using the Hydrologic Engeneering Corps- Hydrologic Modelling System(HEC-HMS) model. The study further used some set of indicators to determine Flood Vulnerability level using the flood vulnerability index (FVI) within the basins. The outcome of the LULC revealed that the built-up areas increased from 19.7% to 34.4% and then to 54.4% in 2001, 2012 and 2035 respectively. The discharge of Jakara basin indicated a rise from 2001, 2012 to 2035 in the order of 443, 585.2 to 609.7 cm3/sec respectively. However, that of Chalawa shows increase between 2001 and 2012 and a decrease in 2035 as a result of canalization within the basin. The average FVI for the Jakara Basin was 0.6, 0.5 and 0.4 in 2001, 2012 and 2035 respectively. This indicates an increase in adaptive/resilience to flood within the basin eventhough highly vulnerable to flood in 2001. The average risk is 17.5, 19.0 and 16.9 in 2001, 2012 and 2035 respectively. The rise in the average risk values in 2012 is as a result of an increase in economic and physical vulnerability and an increase in discharge giving a moderate flood risk. The Chalawa basin was 0.4, 0.5 and 0.4 for flood vulnerability and a flood risk score of 13.0, 21.6 and 17.2 respectively.This also reveals a high vulnerability especially in 2012 and also high risk.This generally indicates high vulnerability and moderate risk for Kano metropolis within the study period. The study recommends establishment of flood early warning systems, gauging staions at junctions of the sub-drainage basins, flood insurance, an increase in the number of emergency service workers, and creation of canals to convey run-off out of the basins.
Description
A THESIS SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF DOCTOR OF PHILOSOPHY DEGREE IN GEOGRAPHY DEPARTMENT OF GEOGRAPHY AND ENVIRONMENTAL MANAGEMENT, FACULTY OF PHYSICAL SCIENCES, AHMADU BELLO UNIVERSITY, ZARIA
Keywords
ANALYSIS,, FLOOD RISK,, VULNERABILITY,, KANO METROPOLIS,, KANO STATE,, NIGERIA,