The diagrams present strategies for safeguarding houses in flood-prone areas.
The diagrams depict two scenarios: one with a stopbank and the other without. Key features such as freeboard, ponding, and flood levels are highlighted in both diagrams.
The absence of a stop bank necessitates careful consideration of the house’s external structure. A critical aspect is the determination of the freeboard, a protective measure spanning approximately 3 meters from the house floor level to the estimated ponding level, which corresponds to the water levels expected from rivers or drains over a century.
Conversely, the inclusion of a stop bank aims to restrain water elevation. Essential components like the berm and floodgate play crucial roles in maintaining water equilibrium to enable efficient water drainage, known as internal ponding. Moreover, evaporation from the water particles on the ground leads to atmospheric moisture, resulting in precipitation.