When you add your water supply, a menu appears asking for information on the bucket fill time for your supply. This connection value is then used to determine how many irrigation channels your garden needs. Please ensure this value is accurate, or your sprinkler system might not work to its full potential when it's installed.
It's easy to measure the bucket fill time and the flow rate: Turn your tap on fully and fill a 10-litre bucket of water. Measure the time in seconds until the bucket is filled. Enter the measured value in the input field.