CHALLENGES OF POOR DRAINAGE SYSTEMS AND FLOOD CONTROL IN LAGOS METROPOLIS
CHAPTER ONE
Abstract
Flooding is persistent in Lagos Metropolis. The objective of this paper is to ascertain the causes, magnitude, and effects; and to indicate directions for policy makers and urban dwellers. Topographical maps were used for data collection on the physical environment. Some physical measurements were made of the drainage channels and floods. 2,000 inhabitants of the metropolis were randomly selected and made to respond to some questions. In addition, authorities in professionally related fields including policy makers were made to make contributions. Intermittent supplies and torrential rainfall in its seasons are usually beyond the capacities of the channels. These are compounded by inadequate planning of the physical environment, wastes dumped in drainage channels and erosion passages, and deliberate or inadvertent physical structures that block free flow of water along the drains. Floods are as wide as 500m and above on each side of the channels and as high as 2.00m at some times and localities. There are some advantages associated with it. Living habits of the inhabitants have to change. Physical planning efforts have to be drastic, radical and deterministic towards sustainable drainage and erosion channels. There must be massive investment in dredging and re-dredging of the existing drainage network and channelization of the new suburbs. Floodable zones should be re-planned; and flood plains can be rehabilitated as parks and recreation centers.
1.1Background of the study
Human anxiousness as well as quest to improve survival chances and gain better control over their environment has indeed succeeded through man’s constant exploration, exploitation and alteration of the natural environment. This has enabled man to achieve urbanization, industrialization and development in general. These developments have not come without a very high price due to the vindictive nature of the environment. The result or implication of human development is the evolution of serious environmental problems such as deforestation, erosion, global warming, flooding, pollution and recently climate change etc. these environmental problems have prevailed more in the developed nations of the world and urban centers in general. Flooding particularly has caused a lot of the world.
According to Ugbodaga, (2015) the government of Lagos State has warned state residents to prepare for heavy rains and advised residents of flood zones to be ready to move immediately they notice a gradual accumulation of the rising waters due to the poor drainage system that causes flood in the environment. The government said residents should be vigilant and prepare for the consequences of floods resulting from heavy rains in late; it would be in other parts of the country.
Ugbodaga also said that the Permanent Secretary of the Ministry of Environment, reiterated this warning became necessary for the sensitivity of the population to ensure the free flow of rain water into the drain that it is imperative so as to avert consequence of the report of the Nigerian Metrological Agency (NIMET) which predicted heavy rainfall for Lagos State, among others.
Similarly Onisarotu, (2015) stressed that the rainy season was not over, has appealed to Lagosians to clean and clear the drains in front and around them regularly. “People should not panic whenever it rains, as they would start to experience accumulated water concentration on some parts of the roads and highways, depending on the intensity of the rains. We assure you that the accumulated water will recede in no time,” Onisarotu concluded.
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