I know some people will come here to talk about covered drainages, but I'm going to educate you: you cannot have covered drainages in a city that does not have perfect waste management system and where people are not oriented enough on how to dispose plastic and nylon waste just yet. It's going to create a problem of having to desilt every time to clean the clogged drianages, which can be problematic. It's one of the main reason why flooding is a huge challenge in Lagos with little rainfall, they cover drianages and at the end of the day, these drianages are clogged and government finds it hard to desilt covered drianages.

If contractors are aware of this problem, it's possible that they might consider leaving drains uncovered so they can be easily accessed for cleaning. But I think the bigger issue is finding ways to reduce the amount of plastic waste being generated in the first place, and improving waste management systems to ensure that plastic is properly disposed of.

Open drainage design is the best for most Nigeria cities until we get our waste manageme system right and make people are educated enough to know that they cannot through nylon and plastics on the roads.

Good one Mr Otis. Shame on ikpeazu