Table 1 Status of Qanats in Iran
From: Qanat water supply systems: a revisit of sustainability perspectives
Years | Number of active Qanats | Annual dischargea |
|---|---|---|
1950s | ≈21,000 | 18.1 |
1970s | ≈18,400 | 7.5 |
2008 | ≈22,000 | 7.7 |
From: Qanat water supply systems: a revisit of sustainability perspectives
Years | Number of active Qanats | Annual dischargea |
|---|---|---|
1950s | ≈21,000 | 18.1 |
1970s | ≈18,400 | 7.5 |
2008 | ≈22,000 | 7.7 |