The water-air mixture is drained through connection the connection pipeline may be used for drainage, however it must not be lockable.
水-空气的混合液是经接口排泄，这个管路可以用作泄放，但是不能关闭。
2
Connection between dam, foundation, bank slopes and other structures has to be strengthened, and drainage and anti-filtering facilities have to be properly arranged to avoid accident mentioned above.
加强坝与地基、岸坡或其他建筑物的连接，合理布置排水及反滤设施，以避免事故的发生。
3
The connection technique of large diameter old-new drainage pipes has been discussed under the complicated condition.