A filter is required in which type of irrigation system?

Drip irrigation systems require a filter to ensure that the water being supplied to the system is free from debris, sediment, and other contaminants that could clog the emitters. Since drip systems deliver water directly to the root zone of plants through narrow tubes and small emitters, even the smallest particles can cause blockages. A filter helps maintain the effectiveness and efficiency of the system by preventing clogs, which can lead to uneven watering or reduced crop yields.

In contrast, surface irrigation typically relies on gravity to distribute water over large areas, making it less susceptible to clogging from sediments. Sprinkler irrigation systems, while they can experience some clogging issues, usually are less sensitive to small particles compared to drip systems, and they often have built-in mechanisms to mitigate this. Subsurface irrigation often uses larger pipes or tubing, where potential blockages are less of a concern compared to the fine emitters used in drip irrigation.