Why does the word Hui belong to water?

Hui: The modern stroke is 12, the Kangxi dictionary stroke is 15, and the five elements of the word belong to water.

Generally speaking, characters with radicals such as fire and light belong to fire, but there are exceptions. Like water. If you press the peak, it should belong to soil, but in fact it belongs to water.

In the theory of five elements, it is generally believed that there are five kinds of behaviors of charity; People who are civilized and polite and give off heat and light will act like fire; Honest and tolerant people have five behaviors; All intelligent and active people act like water; Those who are brave and hard in texture pay five acts of gold.