Purify the environment: Rain can wash away garbage on the ground, take away unpleasant odors, dilute toxic gases, and purify the environment. Rain is used as drinking water in water-scarce areas, and it can be purified through hillsides or natural wetlands. Power generation: When the amount of rainfall reaches a certain level, it can generate electricity. Although the power generation capacity is not as much as needed for water conservancy, it can be used by the reservoir. Adjusting the climate: It will rain when warm air containing moisture meets cold air, so adjusting the climate is its most basic function.

1. Purify the environment: A rain can wash away garbage on the ground, take away unpleasant smells, dilute toxic gases, purify the environment, etc.

2. Rain is used as drinking water in water-scarce areas. It can be purified through hillsides or natural wetlands.

3. Power generation: When the amount of rain reaches a certain level, it can generate electricity. Although the power generation capacity is not as much as that required for hydropower generation, it can at least generate electricity for individuals and for reservoir use.

4. Adjust climate: Only when warm air containing moisture encounters cold air will it rain, so adjusting the climate is its most basic function.