Answer:
Flood barriers
Explanation:
Many towns in flood-prone areas are surrounded by flood barriers that are built to hold back rising water during seasonal highs. 
- Flood barriers are water resistant walls that are used to prevent breaking water during a high period of inundation from their channels. 
- They are usually vertical artificial structures which can be temporary or permanent. 
- They help to hold or contain the flood water during the high season. 
- These walls prevents flood plains and other nearby areas from getting flooded during the rainy season.