How wide is the splayed wall of spillway?

Multiply the length by the width by the height and then divide by 2, that is, first calculate the square of the cuboid where the splayed wall is located, and the square of the splayed wall is half of the cuboid.

Eight-character walls, as the name implies, are two walls shaped like eight characters, which are the two sides of the culvert entrance and exit. An ancient building should be two splayed walls at the entrance of an ancient mansion or yamen. Generally, slogans or couplets are written on them, such as justice and honesty.

In Ming and Qing dynasties, the screen wall was divided into one shape and eight shapes in form. There are many eight-character walls on both sides of the gate of a large residential building in Beijing, which are opposite to the eight-character shadow wall across the road, forming a space slightly wider than the street in front of the gate; Inside the door, a zigzag shadow wall, left and right walls and screen doors form a square yard, which becomes two transitions from the street to the house. The screen walls of southern houses are mostly built outside the door.