Man I wish I lived in MA so I could make a little money fixing systems up there. I hear there is a guy up there designing sprinkler systems and basing the pipe size used on pressure! And he thinks he can slow down the velocity of the water by using bigger pipe! I have an idea! Since you are using 1 1/4 mainline coming off of what is probably a 5/8" meter, why don't you max out the valves too. Hey I know, why not use 1 1/2 inch valves, 1 1/4 inch laterals and push about 30 gallons per minute (or more) on each valve. Using your logic there will be no velocity, no water hammer, and the lawn should look great. Aqua, I am sure you are a talented man and good at what you do. But, before you join the ranks of the irrigation professionals, perhaps you should do some studying. HB has 30 years on ya and I have 20. No offense to ya, sure you are trying to help. Baaya, I'm sure if you wanted to know exactly what to do, you could email all the pertinent info to either HB or myself and we could help. So far you have not given us enough. There is more that needs to be told prior to designing a system. Much more. I will be glad to help, if you give me all the info! Nice to see ya over on the dark side Chuck!