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************************************************No matter how well you plan Storm Water Drainage System, it
often fails as it has so many missed variables, scores of design and
operational dependencies, aging infrastructure and multitude of agencies to put
blame on, later on.
TREND
Storm water and Urban Flood used to be two different things,
but their boundaries have started to get blurred, as rainfall events are
getting more unpredictable and severe due to climate change and as normal
rainfall events have frequently started causing sticky urban floods that is not
easily dissipated.
POSSIBLE MEANS TO DEAL WITH SITUATION
There are only couple of ways you can deal with storm water
inundation and urban flood events, i.e. either move the city elsewhere OR tame
the nature through uphill dams and artificial mega wetlands at outskirts OR
brace the city with flood barriers OR capture and store part of runoff water
allowing as much water to percolate if water table permits OR make way for
water and allow storm water and floods to pass through city while assuring
minimum impact and damage.
CHALLENGES
Temporal rainfall data of whatever time period used in
modeling is primarily historic data, there is no consideration for future
rainfall event modeling considering climate change, increasingly aggressive
weather events being witnessed every passing year.
Historic Flood data doesn't consider cause and effect of
flood due to slow or sometimes radical temporal change in built form and
landscape of city.
Expanding cities, increasing paved areas, shrinking greens
and disappearing urban waterbodies are changing the overall runoff coefficient
of city converting normal rainfall event into disastrous situations and
unmanaged events.
OPTIMAL SOLUTION
Instead or in addition to regular storm water network if you
plan or redevelop your city as well as design buildings to allow periodic
Inundation and water retention and absorption, that will be less destructive
and less overwhelming then flash floods due to heavy downpour and in case of
actual flood events.
It's important to keep reiterating that Multicriteria based
assessment, design and scenario modeling is of utmost importance for planning
any urban core infrastructure, be it SWD, SWM, Water Supply or Power
Distribution.
#urbanplanning #smartcity #stormwatermanagement
#sustainability #future #water #flood #swale #LID #zerowaste #urban
#cityplanning #townplnaning #municipality #municipalcorporation