Really? Provide the quote ... or is this another case of you putting words in my mouth? I think it is more like you are ignoring how water hammer is reduced by a slow closing valve. If you worked the equations it would become abundantly clear. Perhaps, since you obviously can't work the equations, find a ball valve, put in a pressure gage upstream of the ball valve, a flow gage downstream and record the variation in pressure and flow as you test different closing speeds. If that does not make it crystal clear for you .... then you will never understand. I don't locate irrigation valves to prevent water hammer Pete. I pick a location that is relatively central to the zones being irrigated, with consideration to the source location. I have stated this on many occasions. But since you insist, locating the valve closer to the hydraulic grade line and main water source (reservoir) would a be more effective location to minimize the effects of water hammer due to a closing solenoid valve than locating the valve further from the source. Why? You eliminate long runs of pipe to the valve. You are closer to a larger body of water which will dissipate any resultant hammer much quicker. For resi/comm irrigation that means the POC. You are not adding to the hydraulic head like you would be by placing the valve at the lowest point of the site. If I must have a long run of pipe to valves, and there is a risk of significant water hammer .... then I will spec an appropriate master valve (griswold or actuated ball valve) close to the source in order to minimize the potential for hammer. Just in case you weren't aware Pete .... actuated ball valves don't slam shut.