The diagram provide key information about flood management with and with stop bank to protect the houses in some area.
Overall, it is clear from the image that there is clear a disvantages of having stopbank near from house. In addition, the house with 100 year level will be safe compared to 300 mm, whereas it will be high risk.
According to what is shown, there is two sinario to have a stopbank or not which will help the buildings to lower the consequence of the flood. The process start when the rain is start, the rain comes from the mountains and this called internal runoff, however, the rain go under the house and if here any stopbank, the water will stay on ground.
In terms of if there is no stopbank, the diagram suggested raising the building from 100 to 300 so the water won’t touch the house, whether it is there internal runoff or not.
