Road drainage pipes see whether smoothly, and the existence of water leakage phenomenon can tell pool, sometimes, bathtubs release of water, and then discharged, check the drainage rate.

• 看排水管道排水是否顺畅，上水管是否存在渗漏现象，可以把洗菜池、面盆、浴缸放满水，然后排出去，检查一下排水速度。