What is your water pressure and gallons per minute..

How many zones do you plan on doing?

What is your Plant water requirement?

Thanks for the response. I'm in the initial stages of planning, so I don't have answers to your questions.

I'm just looking for general comments as to why someone would need 3/4" rather than 1/2"? I understand you can theoretically deliver more water in less time, but in drip watering that may not be the desired outcome. I assume there is a point where psi would require 3/4" rather than 1/2"?

The only thing I know for sure at this point is that I will have two separate runs off a splitter that go to opposite sides of my house. Each run will be no more than 100' total. It will strictly be drip for garden beds and 5 gallon buckets.

Others have suggested 1/2" since it is the most used. At what psi will fittings blow out of 1/2" but not 3/4"?

Big pipes like that are for very large areas. They need to be able to do a ton of watering at once, otherwise it would take all day to water.

It's all about how much water can pass through, not the PSI.

Hi,

here are some spreadsheets on pressure loss as well as max GPM the most commonly used piping types can withstand - http://www.irrigationtutorials.com/spreadsheets-for-calculating-pipe-pressure-loss/

I recommend exploring the whole site!

regards