While doing repairs at a site last week I had to do some reasearch on a system because we have no asbuilts from the installing contractor. Discovered that the booster pump was installed without a "flow cutoff", "hi/low" switch (various names). This system is only about three years old, is on one of our new elementary school sites and there are two other sites with the same set-up... domestic water source boosted for the large field sprinkler zones. When the field controller comes on it also activates the booster pump through the pump start relay. Problem is... if there is no water going through the system due to someone shutting down a zone valve, an isolation valve or the backflow device the booster pump will still run the entire duration of the zone/system program without water going through it. This can lead to the booster pump motor burning up, requiring expensive repairs and/or replacement. Even though the systems were designed by an irrigation consultant it's possible that the consultant is not up to speed on booster pumps. The info was turned over to the head district electrician who is looking into installing switches on each pump. Good thing is... there are two new school sites in the final design stages where a change order was initiated to insure that their booster pumps are installed with the switches.