You can blame our government for money mismanagement but even if they are not managing money, this will not stop flooding and it depends on how massive heavy rainfall and storm result to flooding. Despite there are good drainages, it is possible that the water can submerge the drainages and result to a significant flood with loss of life and properties.
I think the flooding would be low if Nigerian government didn't default on creating dams and putting the necessities in place a long time ago. If they did, the flooding wouldn't be as devastating as it has been in recent years. This isn't the first time and it's not just the issue of flooding. Nigerian governments overtime has defaulted in a lot of things.
As long as it doesn't affect the overall state of the nation, it's of little concern. I know Flooding is a natural disaster but it can be managed so the damage isn't so extensive. Who reimburses the common citizen when his properties are damaged by flood(s)?