Final answer:
Early warning systems and underwater exploration devices are useful technologies in flood-prone areas.
Step-by-step explanation:
One type of technology that would be useful in flood-prone areas in the United States is Early warning systems. These systems use sensors and data analysis to detect changes in water levels and predict potential floods. They can provide valuable time for residents to evacuate and take necessary safety precautions. For example, the National Weather Service operates the Advanced Hydrologic Prediction Service (AHPS) to provide flood forecasts and warnings based on river observations and rainfall data.
Another type of technology that can be useful in flood-prone areas is Underwater exploration devices. These devices can be used to gather information about flood conditions, such as water depth and currents, which can help in planning and implementing flood control measures. For instance, remotely operated vehicles (ROVs) can be deployed to survey underwater areas and assess the impact of flooding on infrastructure.