Piezoelectric type rainfall sensors and optical rain gauge​ play vital roles in rainfall measurement. Piezoelectric type rainfall sensors work by converting mechanical stress from raindrops into electrical signals. When raindrops hit the piezoelectric material, it generates a charge proportional to the force exerted by the ra Rainfall is a significant component of the hydrological cycle. optical rain gauge​, on the other hand, use light – based technology to detect raindrops. They emit a beam of light and measure the scattering or absorption of light as raindrops pass through it. This allows for accurate measurement of rainfall intensity and rate.Evaporation measurements are also an important part of rainfall monitoring.

Evaporation

It is another important process in the hydrological cycle. It occurs when water changes from a liquid to a gas. Rainfall and evaporation are closely related. After rainfall, it can occur from the surface of bodies of water, plants, and soil. Piezoelectric and optical rain sensors can help in understanding the relationship between rainfall and evaporation. For example, by measuring rainfall accurately, we can better predict the amount of water available for evaporation.