Garden & Water Utilities
Irrigation Zone Flow Calculator
Add the flow from each emitter, sprinkler or micro-spray to estimate a zone's flow, water per run, and total usage across zones. Enter flow in gallons or litres per minute and optionally compare it with your source.
Add every device on the zone
Zone flow is the sum of the flow from all devices that operate together. Colorado State University Extension recommends separate irrigation zones and says to add the flow of emitters and components so the zone does not exceed available flow. Its conservative source check uses 75% of measured source flow.
Source: Colorado State University Extension, “Drip Irrigation for Home Gardens”.