The most common drainage problem in a community is flood waters. This occurrence is the mere passage of stormwaters across areas that would normally not be affected in small storms. Remember that flood waters:
of large quantities of water, often very turbulent and murky due to fine sediment and other soil.
in moderate to large storms and can reach depths over the head of an individual.
large areas and impact any structures in their path.
refer to ponding or localized drainage around buildings during small to moderate storms.