Sven,
The large diameter hose is used to provide a large volume of water to the Pump.
It's the pump that provides the pressure,
the size of Feeder, is governed by the type and number of deliveries(hoses) on the Output side of the pump.
Paul,
Our hydrants are also in the road, they have a 1 metre yellow circle around them, park anywhere in this circle, and it will cost you NZ$150, if you are caught.
