Rain-out model

The rain-out model is like a big imaginary machine that tells us how rainfall affects the amount of water in the soil. Imagine a big glass jar filled with dirt and sand, and at the top, there is a sprinkler that sprays water to make it rain. Now, when the rain falls, it doesn't all soak into the soil at once. Some of the water runs off the top of the soil and back into the jar. This is just like when you pour water on a table, and it runs off the edges.

Now, if the rainfall is really heavy, the soil can't absorb all the water, and it keeps running off the top. This is called runoff. But if the rainfall is slower and lighter, the soil can soak in more of the water, and this is called infiltration.

The rain-out model helps us understand how much of the rainfall is going to run off and how much is going to soak into the soil. This is important because it helps us determine how much water is available for plants to use and how much might become a flood when there's too much water.

So to sum it up, the rain-out model is like a big experiment that helps us figure out how much rainwater gets absorbed by the soil and how much runs off. This is important because it helps us understand how much water is available for plants and how much could cause a flood.