Additional information about 竇
說文解字:
- Criteria
- DRAIN
1. The whole system of rainwater drainage from eaves down to the hole in the ground receiving the water, including the shuǐ cáo 水槽 along which the water is descending, is called liù 霤.
2. Dòu 竇 refers specifically to the hole in the ground designed to receive water.
NB: Dī shuǐ 滴水 is a post-Han term (MING) for the tile especially designed to receive the water.