We measure irrigation system flow in gallons per minute (gpm). What is the maximum flow rate of your irrigation system in gallons per minute? Please ask your irrigation specialist or feel free to estimate.
To estimate your flow rate you will need to determine what your largest zone is. This would be the zone with the most sprinkler heads. Count up the number of heads in that zone and multiply that number by 3. This is the number you will use for this section.