The diagrams illustrate two scenarios preventing 
Use synonyms
flood
 that can cause Fix the agreement mistake
floods
damages
 to Fix the agreement mistake
damage
building
 in Change the verb form
build
Use synonyms
area
.
Apparently, Add an article
the area
raining
 plays a vital role in causing Replace the word
rain
Use synonyms
Add an article
a flood
the flood
flood
, the Fix the agreement mistake
floods
rain 
Correct your spelling
rainwater
water
 runoffs the land and slides into Use synonyms
lower
 ground Add an article
a lower
the lower
area
 which is located near the river. Use synonyms
Therefore
, the liquid will be Linking Words
stucked
 in Correct your spelling
stuck
building
 Correct article usage
the building
area
 which is the lowest part of Use synonyms
land
.
The stopbank was made to stop the Add an article
the land
water
 flowing back Use synonyms
in
 the lowest Change preposition
into
area
 where houses and buildings had been located. Use synonyms
In addition
, Linking Words
floodgate
 had been placed on Correct article usage
a floodgate
ground
 level near the river, Add an article
the ground
this
 helps Linking Words
water
 Use synonyms
flowing
 through the pipe and is released to a large Wrong verb form
flow
water
 source.
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However
, there are some places that Linking Words
has
 no stopbank, Change the verb form
have
instead
 of placing Linking Words
Use synonyms
water
 stopper, Correct article usage
a water
building
 should be raised up to prevent the Add an article
the building
a building
damages
 from Fix the agreement mistake
damage
Use synonyms
flood
. The buildings were raised higher than the 100 years Add an article
the flood
flood
 level. These two options can help many houses safely from natural flooding.Use synonyms