For example, some deter pests, some help drainage.

You can get a drainage grant these days.

The improvement in sewerage and drainage has resulted in better health.

So every one of our schools has a rainwater collection system.

Very low cost three classrooms and rainwater collection is 5,000 dollars.

And our brains our celebrated brains reflect a drainage of a tidal marsh.

And it can collect six million gallons of rainwater in one season.

And all the rainwater that drops on the Mountain is actually accumulated.

Do they, for instance, capture rainwater so that we can reduce water use?

It's a dendritic drainage pattern that can be formed only by the flow of liquids.

Big structures often had drainage tunnels into the sewers in case of flooding down in the subbasements.

Here's a design for harvesting rainwater that's super cheap and available to people in the developing world.

If we have four years of drought, we still have water on the campus, because we collect rainwater.

Their spending loads, loads, to channel that rainwater out into the ocean when it rains and floods as well.

Another important point of these sand banks is that when it rains, the rainwater soaks down into the soil.

We then dug a big hole to put in a rainwater catchment tank to take our yard water independent.

Grooved Ware in the beginning of modern drainage practices, which we also see in Skara Brae on the west coast of Scotland.

Barefoot technology this was 1986 no engineer, no architect thought of it but we are collecting rainwater from the roofs.

So this rainwater is flooding down the hillside, carrying with it sediments from the construction site, smothering the coral and killing it.

Or, if you want to paint, you can paint it blue throughout because every roof which you see in this picture collects rainwater drops and deposit in the rooms.

So, look at the beauty from the desert society who can harvest rainwater, and also create something through a tire from a jet plane, and used in a camel cart.

There's a company making a product called Lotusan, which mimics when the building facade paint dries, it mimics the bumps in a self cleaning leaf, and rainwater cleans the building.

Porous asphalt, a material that we use now in most of the highways in the Netherlands, it has pores and water can just rain through it, so all the rainwater will flow away to the sides, and you have a road that's easy to drive on, so no splash water anymore.