I am installing a lawn irrigation system. I have an old irrigation pump 1 1/2 hp I picked up from an old system. I drove a 1 1/4" point down into a water table which started at 7 ft and I drove the point into it for an additional 8 feet. The well point is 36". The Well point is 8 feet into the water table as measured by the static water level in the point. My problem is I am only getting 10 Gallons per minute of water. I'm not sure if this is because of the size of the point, the amount of water available in the well (did I need to drive it deeper) or the capability of the pump. I was considering buying a new pump but I am afraid if the problem is the well I will get the same results. How can I check this?