LEC 7 Flashcards
part of Eath’s natural hydrologic cycle
floods
when the hydrologic cycle gets out of balance, it sends more water to an area than it can normally handle resulting to__
flood
inundates a floodplain
flood
the ____ is partly attributed to its geographical attributes
perrenial flooding
around ___ principal rover basin across the country
421
an average of __ typhoons enter the country annually
20
Total of ____ ha of land nationwide are subject to flooding
1,316,230
32% of flooding is in __ alone
central luzon
major categories of flood
riverine flooding
coastal flooding
shallow flooding
flooding that occurs along a channel is called ____
riverine flooding
a severe storm that drops much rainfall in a short time can generate ____
flash flood
changes the shape of channesl
erosion
a curve in a channel
meander
can undercut structures
riverine erosion
typhoons and severe storms cause most __
coastal flooding
persistent high wind and changes in air pressure push water toward the shore causing a ____ which can raise the level of a large body pf water by several feet
storm surge
occurs in flat areas where a lack of channels means water cannot drain away easily
shallow flooding
shallow flood problems include:
sheet flow
ponding
urban drainage
special flood hazards (CUDIM)
closed basin lakes
uncertain flow paths
dam breaks
ice jams
mudflows
It alters the floodplain and the dynamics of flooding
development
buildings and infrastructure are damaged by ___
periodic flooding
Human development can have an adverse impact on floods and floodplains.
riverine floodplain
watersheds
coasts
main causes of flood damage: (HDHSS)
Hydrodynamic forces
debris impact
hydrostatic forces
soaking
sediment and contaminants
