The pictures below show what I am referring to as"box drains" under construction, on the east side of the road between Egipura jn and the bridge over the strorm-water (rather sewage) drain, in Koramangala.
What is noticeable is that the drain box top is much higher than the surface levels on either sides, making it impossible for the rain-water falling on the road surface to flow into the drain, apart from making it difficult for the dwellings/ establishments beyond to access the road.
I was thinking that this was some novel innovation that the BBMP engineers had come up until such time as a civil engineer friend, fairly knowledgeable about road engineering aspects, himself raised the matter with me. Well, the only positive I can think of in such an arrangement is that it provides for a fairly level pedestrian walk-way on top of the drain. I don't know if this is an acceptable international practice, though - perhaps, Prajagalu would like to enlighten me.
Even if it is an acceptable practice, given the poor record of BBMP in the matter of providing even and safe drain covers, leading to many a pedestrian falling into the drains and braking their bones, I am not sure such a practice is recommended for Bengaluru, at least until such times as we have a more accountable BBMP.