| Value | Category | Cases | |
|---|---|---|---|
| 1 | Water Seal | 2686451 |
69.3%
|
| 2 | Pour Flush | 569937 |
14.7%
|
| 3 | Pit | 482096 |
12.4%
|
| 4 | Bucket | 12206 |
0.3%
|
| 5 | Other | 35238 |
0.9%
|
| 9 | Not Reported | 91322 |
2.4%
|
| Sysmiss | 178006 |