Thames & Kosmos Green Engineering: Clean Energy & Sustainable Living handleiding

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Handleiding

EXPERIMENT 9:

COLLECTING WATER

Climate Adaptation and Greening

Rainwater runoff

You will need

– Assembled model house

– Green roof with grass

– Measuring cup “rain barrel”

– Water

- Cup

– Stopwatch or cell phone

Here’s how

1. Measure 50 ml of water with your

measuring cup and pour it into a cup.

2. Make sure the silicone tube is connected to

the gutter and inserted into the measuring

cup at the bottom (figure 5).

3. Have a stopwatch or a mobile phone with a

stopwatch function ready.

4. Pour the 50 ml of water slowly onto the

grass covering of the roof and start the

stopwatch.

5. After 30 seconds, measure how much water

has arrived in your “rain barrel” (the

measuring cup).

6. Repeat this experiment without the grass

and the cotton mat. To do this, take them out

of the plastic tray. How many milliliters of

water pour into the measuring cup in 30

seconds this time?

In the ﬁrst experiment, less water ends up in the

measuring cup than in the second experiment without

the grass. Some of the water is fully absorbed by the grass

and the cotton mat, and the rest ﬂows more slowly.

In this experiment, the water that you put on the grass or

the plastic tray represents the rain that falls on house

roofs. Rain that falls on a green roof is held back and

ﬂows more slowly. This prevents streets and sewers from

being ﬂooded by too much water in too short a time,

especially during heavy rainfall. In regions where climate

change is causing heavier rainfall, green surfaces can

mitigate potential ﬂooding.

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