underground drainage - Robuta Search

https://www.fox5ny.com/news/mama-dog-puppies-rescued-from-underground-drainage-ditch

Life on the streets has come to an end for a dog and her puppies in Monroe.

https://www.businesstimes.com.sg/international/pub-eyes-underground-water-drainage-and-storage-singapore

It'll carry out 2-year study on design options for tunnels, underground reservoirs and a hydropower system