Q4-2 Water comes out of the hole in the retaining wall of the adjacent land. What about it?

It is called a "draining hole" that is provided to prevent excessive force on the retaining wall when rainwater penetrates the ground, and plays a very important role in the safety of the retaining wall (Residential land development) Please note that it is a technical standard for development).

Summary of Guides, etc. on this answer

• About the drain hole of the retaining wall
  “Guide to Residential Land Development” Part 3, Chapter 3, Section 1, Section 4
• Technical standards for construction related to residential land development
  “Guide to Residential Land Development” Part 1, Chapter 2, 5

Contact for inquiries regarding this answer

• About permission of construction about residential land development
  Housing and Architecture Bureau Residential Land Examination Department

For specific details in a specific location, please contact the person in charge of each area.