Why zones must water one at a time
Water in a main should travel at about 1.5 m/s. Past 2 m/s friction losses climb steeply and closing a valve starts to produce water hammer — the thing that cracks fittings over a season.
With one valve open at a time, the demand on the main is one zone’s worth, never the whole farm’s. Open two together and pressure falls, the emitters furthest from the manifold run starved, and that end of the block underperforms all season without anything visibly breaking. Our controllers sequence zones so this cannot happen by accident.