How to Measure Your Sprinkler System’s Water Output (The Tuna Can Test Guide)

How to Measure Your Sprinkler System’s Water Output (The Tuna Can Test Guide)

Many Gulf Coast lawn problems are caused not by lack of water — but uneven watering.

If one section of your yard receives too much water while another gets too little, you may see fungus, thinning grass, or patchy growth.

Here’s how to measure your sprinkler system properly.

Supplies You’ll Need

• An empty tuna can (about 1 inch tall)

  Or any flat-bottom container

• Measuring tape or ruler

• A timer or clock

Step #1 - Set Up Containers

Place 2–3 containers in a straight line from the sprinkler head outward.

This helps determine if water distribution is consistent across the zone.

Step #2 - Run the System

Turn on the irrigation system for 15 -20 minutes.

This gives you a measurable baseline.

Step #3 - Measure Each Container

Check how much water collected in each can.

If one can has significantly more or less water, your sprinkler may need adjustment.

Step #4 - Calculate Watering Time

Example: If you collect ¼ inch in 15 minutes, that equals ½ inch in 30 minutes.

Adjust runtime to reach your weekly watering target.

Why This Matters on the Gulf Coast?

Sandy soils in Mobile and Baldwin Counties drain quickly.

Uneven watering leads to:

• Potential for lawn disease

• "Hot spots" or dry spots from uneven watering coverage

• Weak turf roots

• Higher water bills

  
  

Measuring output helps prevent these issues.

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If you notice uneven coverage or excessive runoff, Southern Target can inspect and optimize your irrigation zones.

Proper watering is one of the most overlooked parts of lawn care in South Alabama.

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