There are some sophisticated logarithms available, but unless you’re an engineer, you might have trouble applying them.
Don’t despair…there is an easy way to find out how much you are watering.
- Evenly space six or more straight-sided food containers (tuna cans, cat food cans, even small rain gauges) across a zone.
- Run your sprinkler system for 15 minutes.
- Measure the water in each can with a ruler.
- Add up all the measurements and divide that number by the number of cans. This will give you an average amount of water the system is putting out for 15 minutes.
- Multiply the average by 2 (15 minutes X 2 = 30 minutes). Round the final number out to the nearest ½ inch.
- This will give you an idea of how much water your sprinkler system is emitting in a half hour.
How to comply with the recommendations and still have a healthy lawn:
- If the recommendation is one inch per week, then water one-half inch on each of your Defined Irrigation Days.
- If the recommendation is ½ inch, water ¼ inch on each of your DIS days.
- If you have a programmable controller, then water each zone twice (cycle and soak method) each prescribed day for the same amount of time as shown in the chart.