Your points are good and authentic but,
Parts playing aside, hmmm we are talking about the flood and looking from it's cause, the best little drainages will not give a positive impact as to collecting the large water body that was released into the country

I mean, majority of us saw the release of the water and if I'm not mistaking the Nigerian government should have put things in place Also (extra large water collectors)
I rarely do the blame game, but on this one I'll have to blame it on the Nigerian government... My view ✌️❤️