The diagram illustrates how buildings in flooding-prone areas can be safeguarded. Overall, the picture shows two methods in which a house can be protected; one is building a stopbank on the riverbank and the other is raising the height of the building above the flood level.
First, in one with a stopbank, The stopbank is built along the riverside over the berm. The 100-year flood level is the mark of maximum flood level, from that mark to the height of the stopbank is freeboard. At the bottom of the stopbank, there is a floodgate that sends water back into the river due to internal ponding by the internal runoff of water during rain.
In contrast, the second method is without the stopbank in which the buildings are raised from the ground floor of a certain height. The ponding level and the house floor level is the freeboard must be at least 300mm to prevent flooding into the house. So the building must be raised by the height of the freeboard from the ponding level or flooding level.
To summarize, the one with a stopbank and without a stopbank can be effective when the area is prone to flooding, and both are suitable for the riverside buildings. 
The diagram illustrates how  
buildings
 in flooding-prone areas can  
be safeguarded
.  
Overall
, the picture  
shows
 two methods in which a  
house
 can  
be protected
; one is  
building
 a  
stopbank
 on the riverbank and the other  
is
 raising the  
height
 of the  
building
 above the flood level. 
First
, in one with a  
stopbank
, The  
stopbank
  is built
 along the riverside over the berm. The 100-year flood  
level
 is the mark of maximum flood  
level
, from that mark to the  
height
 of the  
stopbank
 is freeboard. At the bottom of the  
stopbank
, there is a floodgate that  
sends
 water back into the river due to internal  
ponding
 by the internal runoff of water during rain. 
In contrast
, the second method is without the  
stopbank
 in which the  
buildings
  are raised
 from the  
ground floor
 of a certain  
height
. The  
ponding
  level
 and the  
house
 floor  
level
 is the freeboard  
must
 be at least  
300mm
 to  
prevent
 flooding into the  
house
.  
So
 the  
building
  must
  be raised
 by the  
height
 of the freeboard from the  
ponding
  level
 or flooding level. 
To summarize
, the one with a  
stopbank
 and without a  
stopbank
 can be effective when the area is prone to flooding, and both are suitable for the riverside  
buildings
.