I sent in the measurements to the Toro design team, and the design they sent back called for 1" pipe going to all heads except the drip system. I thought you always wanted to step down the size of the pipe as you go further from the source? Ie The first few heads would be 1" while the end heads would be 3/4". Besides the cost factor of using all 1" pipe vs 3/4", are there any other drawbacks to supplying all heads with a 1" line. My specs 3/4" pvc line going to the house. Static pressure 70psi For instance, Zone 1 will have 5 340 multi-stream rotors operating at 2.3 gpm for each head. According to their design team, they have each 340 roto head being supplied with 1" pvc pipe. Besides price is this a bad idea?