urban hydrology Flashcards
what is the hydrologic cycle
the continuous circulation of water in the earths atmosphere system
what is urban hydrology
the science and management of water in cities and built environment
rise in extreme weather events hitting urban areas such as
2020 super cyclonic storm of amphan
2013 typhoon Hainan was one of the most powerful tropical cyclones recorded
floods natural factors
local heavy rainfall
river overbook flow
high tides or storm surges
human factors that affect flooding
blocking of channels
building on floodplains
improper land use
what does traditional hard urban flood management include
includes a stream channel and a flood plain
river would be impacted by dikes bank reinforcement and chnnelsation
often wetland areas are removed.
impacts of bank reinforcement
reinforced concrete brik banks
bare bank top
channelisation
bank and channel re sectioned
is flood risk increasing
yes
hydrological effects urbanisation
converse of natural land to sealed impervious surfaces
decrease in permeability
increase in run off
resilience to flood events Is reduced
what is the newer based management approaches
making space for water
how does making space for water work
makes use of natural resources such as floodplains
restores meadners slows down the downstrea passage of flood wave
restores wetlands
what sort of different approaches do they take
low density building on regulated flood plains also protected against a 100 year flood
having residences perched on high ground
