Sprinkler System Audit

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Irrigation Water Audit

This page is designed around calculations I use to perform an irrigation audit. This is simply to give you a guideline for water usage and is by no means perfect.

Enter the throat area in square inches for your catch cups. This allows you to use any size container measuring less than 12 inches across as long as you know the throat area in square inches (opening through which the water enters). You will also need a way to measure the volume in milliliters. There are specially designed catch cups for this purpose, as seen in the picture.

Follow this link for information on how to find the throat area of your catch cup (area of a circle).

This is one of the least expensive catchcups available.

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Run Time in Minutes for this test

Enter the amount from each catch cup in Milliliters.

Catch Cup Totals

The distribution uniformity is calculated and updated for every 4 catch cups inputted.

Enter the total square feet of irrigated area

Enter your target inches per year for irrigation in inches. Example, in my area the expected target is 40 inches per year, I however, shoot for 30.

Water Billing Units

  • What type of units is the water billed in?
  • Hundred cubic feet tends to be the most common unit used, often referred to as ccf.

Enter the cost per unit found on your water bill