Wetlands play a crucial role in flood control by acting as natural sponges that absorb and store excess water during heavy rainfall or flooding events. They help to regulate water flow by slowing down the movement of water, thus reducing the risk of downstream flooding. Wetlands also help to recharge groundwater and provide a buffer against storm surges and tidal waves. Overall, wetlands act as a natural defense mechanism against flooding by absorbing, storing, and slowly releasing excess water, thereby minimizing the impact of floods on surrounding areas.