Water tanks which harvest rainwater and stormwater during monsoon season. Main function of the hauz was to collect rainwater over a large expanse of land.
- Project Name: Delhi Sultanate Waterworks, Ancient network of water harvesting structures, Delhi, India
- Climate: Overlap of humid subtropical and semi-arid
- Year: 1206 A.D. – 1526 A.D.
- Water type: Drinkable rainwater
- Landscape type: Ridge landscape
- Altitude: 220-230 m.a.s.l
- Soil condition: Alluvium, Quartzitic ridge
- Material: Excavated soil
- Period: Fixed
- Form: Surface
- Use/ function: Water harvesting