yea the flooding there is bad, saw some of it on the news the other day. for the flooding part its personnal opinion. if it was me, I'd first try an alternate route which is less flooded and less/slower traffic. soaking your drivetrain in water is really bad and can wash out the grease in your bottom bracket, so i've been told. if there isnt another route, i evaluate the sidewalk being that i could see where it ends and the road starts, nobody wants a sudden drop into merky depths. as for riding on the road. sticking to the right is only where practical. so deep water- move left. but you'll have to consider the currents kicked up from passing cars. and the spash zone.