| Value | Category |
|---|---|
| Type not used by the household | |
| 1 | Used for a small part of the area irrigated (up to 10%) |
| 2 | Used for a significant part of the area irrigated (from 10% to 50%) |
| 3 | Used for most of the area irrigated (more than 50% but less than 100%) |
| 4 | Used on all of the area irrigated (100%) |