pervious materials造句

• For example , after the collapse of ditong dam in idaho , may 5 , 1976 , it was found that it was not impervious very well , the impervious curtain was built poorly . when the seepage went through the impervious curtain , the exit water from the pervious material of the downstream or the right side of dam through the foundation or certain line between the foundation and the dam caused contact scour and piping
  如美国爱得华州提堂坝于1976年5月5日溃决，事后调查分析，因坝基透水性大，防渗帷幕施工质量差，渗流穿透帷幕，经地基或地基与坝的接触面从坝体下游侧透水料区逸出或从右坝肩绕渗经下游坝体逸出，出逸的水流引起了接触冲刷和管涌，导致溃坝。