| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | harvesting rainwater | North Africa | Rare due to limited rainfall and reliance on other water sources such as desalination | 1 |
| 2 | water supply in drought-affected areas | North Africa | Historically, aqueducts and underground water systems were developed to cope with water scarcity in drought-affected regions. | 1 |