It doesn't have to be just a speed bump, just about any bump I hear this noise. When I don't go over any bump the car rides smoothly and no noise.
If we neglect air friction, we can assume the horizontal velocity is constant and is equal to 40 cos 25 36.35 m/s. At that rate a given slug of water from the hose takes 1.04 sec. to travel 35m. The vertical velocity of the water varies and is equal to 40 sin 25 - gt 16.9 m/s - 9.81 m/s^2 (t). The vertical height is equal to the integral of velocity over the time, or H 16.9 (t) - 9.81/2 (t)^2 For t 1.04, H 12.27 meters above the nozzle. In the real world we can't neglect air friction, so the actual height would be less than this. But the equations are more complicated and less definite. We would have to know the diameter of the stream and find some fudge factor for the friction between air and the stream. This would take some digging, and there would be some disagreement on the value among different sources.
more than likely a manufactures defect or if close to fitting it was over heated when plumber installed
