I checked flow with the bucket method. Meter is 5/8" to 3/4" copper to 3/4" backflow to 1" pvc. In 30 seconds,5.5 gallons of water came out which is 11 gpm. Static pressure was 52 psi. Can anyone help me with the lawn part of the irrigation system now? Based on earlier reccomendations,I was going to go with Hunter SS I-20's. I was going to use 4 heads per zone. Are my flow and GPM numbers fine for this? Also,in reference to total GPM for each zone,do I use the number I got which was 11,or do I use 80% of that which would be 8.8? By the way,the main will be 1"poly and all laterals will be kept 1" also.