The CapeAbility catch can is an Australian designed and manufactured can designed to give you an accurate measure of how fast water is applied through your irrigation system.
A set of cans should be placed in the area being irrigated, the system is then turned on and the water from the system is caught in the cans. At the end of a fixed period of time the amount of water in the can can be recorded and the application rate in millimetres per hour can be calculated.