There are many people in urban areas. If there are floods, it could kill a lot of people. Also, floods sometimes damage buildings. If the buildings collapse, it would cause a big problem.
My guess would definitely be false, public transportation seems like a much more reliable mean.
Deposition has to do with deltas because when deposition such as water wind or ice moves the sediments and deposits them at the end of a river lake or ocean a delta is formed
