flood and flash flood Flashcards
basically means an overflowing of water from streams and other bodies
flood
a transitory pour out of a normally waterless area due to spill over of a body of water
flood
can also be overflow of mud flow caused by buildup of water underground
flood
these hydrometeorological disturbances such as tropical cyclones,
heavy and extended rainfall
it can generate elevation of ocean level to ground height to several feet
storm surge
it coincides with high stream flows can aggravate flooding near the coast
hide tide
it increases the resistance of ground surfaces due to concrete roads
infrastructure and coastal
it causes blockage of waterways
haphazard dumping of garbage
generates landslides in the slopes of hills and mountains
blasting
intrusion of waterways can hinder the normal flow of floodwater
informal settlers
decreases the permeation capacity and speed of flood flows
deforestation
is usually confined along river beds and low-lying areas of the metropolis
minor flooding
affects many neighborhood and stretch rapidly to adjacent shoreline of comparatively lower elevation
major flooding
how many hours normally do floods take to develop after an intense downpour
12 to 14
how many hours does it take for a FLASH FLOOD to develop
six hours
build up in areas with steep slopes of rivers
flash floods
an unusual ascend of water during a typhoon
storm surge
is the elevation of water level during a typhoon caused by both high tide and storm surge
storm tide
is a direct result of strong winds during a tropical storm or hurricane
storm surge
is a direct result of storm surge beside quarters with shallow shorelines or beach-front areas
coastal flooding
storm surges can set off flooding coastal areas ______ hours prior to landfall
3 to 6 hours
winds is directly proportional to storm surge and inversely proportional to atmospheric pressure
wind/pressure effect
heavy precipitation caused by typhoons increases the total surge height near the coast
rain fall effect
if the storm surge coincides with the occurrence of astronomical tide
tidal effect
the gentler is the slope, the higher is the surge in the coastal areas
shape of the coastline