Nigeria’s Perennial Flood: Occurrence of preventable disasters II, by Prof MK Othman The question I asked in the last line of this piece last week was, “What are the causes of floods, and how have we failed to prevent their occurrence in recent years?” The leading causes of floods in Nigeria are well known. These include inadequate drainage systems, silted dams and waterways, invasion by aquatic weeds, typha grass overgrowing in river channels and beds, as well as illegal diversions, encroachments on waterways for construction and farming, heavy rainfall over long...