Drainage system is a system constructed for the purpose of draining waste water from our homes and surrounding in other to avoid accumulated waste water in our environment. It also helps to channel storm or runoff water during raining season in other to avoid flooding and presences of stagnant water. Park (2007)
Poverty has forced many to occupy areas prone to floods and mud landslides in area which has no good drainage system. Due to these, as observed in Caracas, Venezuela over half a million people lived in the flood prone areas and so many lives and properties have been claimed by this hazard.
In words of Mba (1996), poor planning as it has to do with the hydrological and topical characteristics of some areas, runoff is forced to flow along the roads, gutters and overflow into depression where seasonal lake develop which would ultimately flood with subsequent rain.
Examples of cities where houses are constructed directly on drain channel to include Lagos, Calabar and Ibadan, and that this practices has resulted into blockage of storm drains and consequently leading to inundation and flooding of streets.
In a news report by D.B.S. during the 2002 flood credited to NESREA, stated that maintenance of waterways and the avoidance of dumping of waste into water body should be ensured to permanently eradicate flood.
References
Mba (1996); “Agricultural Drainage Criteria”. Cairo London, Wesseling Publisher.
Park .K (2007): “Preventive and Social Medicine’. India, Barnasidas Bhanot, Jabalpa
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