The given diagrams compare two distinct steps to prevent houses from the risk of being flooded.
In general, it can be seen that houses are protected from flooding with or without using stopbank infront of them.
Now, turning to the details, the first diagram reveals that stopbank is acted as a flood barrier in order to stop water from flooding homes. The stopbank is situated next to the river that is higher than the 10-year flood level, and prevents the excessive water flowing towards the house. Moreover, the houses is built with three pillars to prevent from flooding and a floodgate below the stopbank allows ponding to evacuate the water into the river.
Likewise, as shown in the second diagram, when there is no stopbank, the house needs to be built in a way where its pillar height need to be raised. In this case, the height of the pillars is measured so that the floor of the house is 300nm above the 100-year flood level which is known to be "freeboard".
The
given
diagrams compare two distinct steps to
prevent
houses
from the
risk
of
being flooded
.
In general
, it can be
seen
that
houses
are protected
from flooding with or without using
stopbank
infront
of them.
Now
, turning to the
details
, the
first
diagram reveals that
stopbank
is acted
as a flood barrier in order to
stop
water from flooding homes. The
stopbank
is situated
next
to the river
that is
higher than the 10-year flood level, and
prevents
the excessive water flowing towards the
house
.
Moreover
, the
houses
is built
with three pillars to
prevent
from flooding and a floodgate below the
stopbank
allows
ponding
to evacuate the water into the river.
Likewise
, as shown in the second diagram, when there is no
stopbank
, the
house
needs to
be built
in a way where its pillar height need to
be raised
.
In this case
, the height of the pillars
is measured
so
that the floor of the
house
is
300nm
above the 100-year flood level which
is known
to be
"
freeboard
"
.