Drop in a site photo, set the scale, and lay out heads, valves and pipe. Every arc is thrown at its nozzle's real radius, so what is on the sheet is what lands on the grass.

Pressure, friction loss and velocity, worked out from the pipe you actually drew. It tells you when a zone asks for more water than the tap can give, or mixes rotors with sprays so one of them is always watered wrong.

A head schedule and a material list that build themselves from the plan — pipe counted by size, heads by model. Ready to price, order, or give to whoever is digging.