Hello - I just had a pro install a new lawn sprinkler system for a new lawn at my home. I noticed that when several of the zones shut down, there is a loud clunk from my basement where the plumbing ties in... is that water hammer and is it normal or should I be concerned. He has 8 zones to do about 1/4 acre. The main backflow is run off my water supply BEFORE the pressure reducer for my indoor plumbing. I think my pressure is something like 100 PSI at the spicket (after the PRV). Second, I hear a pulsing noise, like a clicking, coming from the area of the valve box when some of zones are running - I think its one or two with rotors. And advice as to whether I need to worry, or what fix is in order? Also - a design question - there is a strip about 15 feet wide along side of my house. I asked him to run the heads about 8-10 fee off the side of the house, as I plan a garden bed along the house... He ran one row of 360 degree heads down the middle of the 15 foot span. They seem to be about 10 foot radius, which is the head spacing (five heads - this is one of the zones with the "clunking" noise when the zone closes). Thanks in advance!