Chick,

Is this a quiz? Square root(1.5 acres x 43,560 ft/acre)equals 256 ft per side times 4 side equals 1,024 lf of mainline piping. Select the head type you would like to use and look up Rainbird on-line selection. Find your selected head obtain the throw distance per a specific flow rate and pressure. Layout your heads on your scaled plan with overlapping coverage to avoid dry spots. Break the heads into zones that match an economic costing pumps performance curve for pressure and flow. Match the diameter of sch40 pvc mainline pipe that can handle the flow rate of the largest zone. Hope I didn't miss something. I always like doing things backwards. GL JMHO Aloha