Posted on 10 May 2011 at 19:03h

During the winter the roads in Norway are covered in ice, to make them less slippy the council puts grit on top of it. During the course of a winter as long as the one we have just had, there is a lot of grit spread on the road, so when spring comes (now) it has to be swept up. This is done by connecting fire hoses to the hydrant and using the high pressure water to squirt the grit into piles. The maintenance dept. at the college were doing this the other day and to extend their hoses they had bought some old hoses from the fire service. I have never seen hoses with so many holes in before. As you can see in the photo water was spraying out along their whole length. So I was wondering how the length of the little jets vary along the length of the pipe. I would've thought that they would decrease as you move away from the hydrant. Each hole causes a reduction in pressure that results in the next jet being smaller. But what about those long sprinklers that the wheel across fields in the summer? They seem to have fairly even jets.