Every automatic sprinkler system is different, so it is important to take the time to measure your system’s output. With a ruler, some basic math skills, and a few shallow cans (such as tuna cans) or rain gauges, one can easily figure out how long to run their sprinklers for effective green roof irrigation. We have outlined one simple process below and included some links for further reading.
Step 1: Gauge Placement
Using at least three rain gauges or tuna cans, place them in a line leading out from the sprinkler. One should be close to the sprinkler, one in the middle of the range, and one near the outer edge of the range.
Step 2: Measuring
After your gauges are placed, turn on your sprinklers, and let them run for 15 minutes. Turn them back off, and use a ruler to measure the depth of water collected in your gauges. If there is 1/4 inch of water, and you are aiming for one inch, you know that you must run your sprinklers for one hour.
Adjust according to your green roof’s needs and recommendations from your LiveRoof representative.
Additional resources:
Living Water Smart
Home Guides | SFGate
Regional Water Providers Consortium