Areas most susceptible to flash flooding are mountainous streams and rivers , urban areas, low-lying area, storm drains, and culverts.
(Areas most susceptible to flash flooding; are; mountainous streams and rivers , urban areas, low-lying area, storm drains, and culverts) (storm; drains; )
Areas most susceptible to flash flooding storm
are drains
mountainous streams and rivers , urban areas, low-lying area, storm drains, and culverts