Design of pipes such as intake pipe, overfall pipe and drainage pipe of storage reservoir or water tank in building water system cannot often meet the fact according to the experiments.

• 水箱或水池的泄空管、溢流管以及从市政给水管网直接进水时水箱和水池的进水管管径常常采用经验的方法来确定,有时会出现设计管径不满足实际的情况。