# How Many Sprinklers per Zone Calculator

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## What is a Sprinkler Zone?

A sprinkler zone is a defined area of a landscape that is watered by a separate irrigation line and valve. The number of sprinklers needed in each zone depends on a variety of factors, including the size of the area to be watered, the type of sprinkler heads being used, the water pressure and flow rate of the irrigation system, and the type of soil and plants in the area.

## How many sprinklers per zone calculation formula

To calculate the number of sprinklers needed per zone, you can use the following steps:

1. Determine the area of the zone: Measure the length and width of the area to be watered, and multiply these values to find the total square footage.
2. Determine the precipitation rate: This is the amount of water that a sprinkler head can apply to a given area in a specific amount of time. The precipitation rate is usually expressed in inches per hour. You can find this information on the product label or in the manufacturer’s specifications.
3. Calculate the watering time: Divide the desired watering depth (in inches) by the precipitation rate (in inches per hour) to determine the watering time (in hours). For example, if you want to apply 1 inch of water and the precipitation rate is 0.5 inches per hour, the watering time would be 2 hours.
4. Calculate the number of sprinklers: Divide the total square footage of the zone by the coverage area of each sprinkler head. The coverage area is the area that a single sprinkler head can effectively water. You can find this information on the product label or in the manufacturer’s specifications.

Then, divide the result by the watering time (in hours) to find the number of sprinklers needed.

For example, if you have a 1000 sq ft zone with a precipitation rate of 0.5 inches per hour and you want to apply 1 inch of water, you would need:

(1000 sq ft) / (coverage area of each sprinkler) = number of sprinklers needed

(1000 sq ft) / (20 sq ft/sprinkler) = 50 sprinklers

50 sprinklers / 2 hours = 25 sprinklers per hour

Therefore, you would need 25 sprinklers in this zone to apply 1 inch of water over a 2 hour period.