The study examines flood hazards in Port Harcourt. It adopted a field survey design of measuring the level of inundation
in the various zones as well as administration of questionnaires. 320 questionnaires were administrated to solicited information on the
perceived causes of flooding and the cost of properties destroyed by flood. The depth and flood area were measured during every rain
event and averaged. Rainfall data were collected with the aid of rain gauges positioned at each delineated zone. The multiple
regression analysis was used to determine the causes of flood in the area. The results revealed that Port Harcourt is heavily inundated
with a mean area that ranges from 2.3 Km2
at Afam street to Aba and Ikwerre roads with an area of 4.18 Km2
and 4.1 Km2
respectively. The people are highly vulnerable to flood hazards with an average of N1.3 billion worth of properties lost to flood
during the period of study. The occurrence of flood in the area is significantly dependent on heavy rainfall, nature of terrain, houses
on flood plains, block drains, poor heeding to protection law, types of soil, non compliance with regulations, land reclamation and
absence of drainages with r value of 0.97, indicating 95% influence on flooding. This has serious urban and environmental planning
implication, as such it is recommended that urban planning exercise should be vigorously pursuit, as well as provision of drainage
facilities in all the roads and streets of Port Harcourt.