Visiting Expert - Gareth Engineer

Today Gareth, Katrina's father, came to school to talk to us. He is going to be helping us to install our water tank and help us design our bike powered pump.

Gareth explaining Newtons Laws!

First he explained where our water comes from. The water we use in Dunedin comes from Deep Stream, which is 675m above sea level, then on to Deep Stream, which is 425 above sea level onto Silver Stream at 158m above sea level and then to the Macandrew Bay tank above Jane St which is 124 m above sea level.
 Water needs to come from a height to give water pressure. When a place is very flat, like Invercargill, they use water towers. Naseby uses water races based on the Roman aquaduct system.

Our water tank will be about 10m above sea level so we will have very low water pressure.  We need to create the pressure using a pump which we will attach to a bike. We did experiments working our how much pressure and flow we need to water our garden.

We had to time how long the hose took to fill a 10 litre bucket.

It took about 37 seconds. In the classroom we worked out how many litres per second it took.