What is a catch-can test used for?

• A. Measuring water temperature
• B. Measuring spray pattern uniformity and precipitation rate of sprinkler heads
• C. Measuring soil pH
• D. Measuring sprinkler noise level

Answer: (B)

The catch-can test is used to evaluate how evenly water is distributed by sprinkler heads and to determine the rate at which water is applied. By placing a grid of small catch cans under the irrigated area, running the system for a fixed time, and measuring the water collected in each can, you can calculate distribution uniformity (how evenly the area is watered) and precipitation rate (how much water is applied per unit area per hour). This information helps you adjust nozzle types, spacing, pressure, or head selection to improve efficiency and avoid dry spots or overwatering. It’s not about water temperature, soil pH, or sprinkler noise, which are measured by other tests or instruments.