Occurrence of Attributes in Original Text
The text related to the cultural heritage 'Historic Centre of Mexico City and Xochimilco' has mentioned 'Drainage' in the following places:
| Occurrence Sentence | Text Source |
|---|---|
| [67] This valley has no natural drainage outlet for the waters that flow from the mountainsides, making the city vulnerable to flooding. | WIKI |
| Drainage was engineered through the use of canals and tunnels starting in the 17th century. | WIKI |
| [77] The 1967 snowstorm coincided with the operation of Deep Drainage System that resulted in the total draining of what was left of Lake Texcoco. | WIKI |