1·Impermeable soil can also prevent drainage, leading to root damage.
防渗土还可以防止排水，导致根损害。
2·Design of impermeable layer is the central issue; construction should guarantee the design requirements with the highest quality.
设计的核心内容是防渗层，对施工的要求是要确保高质量地满足设计要求。
3·The impermeable wall is the most efficient method to deal with leakage. The impermeable wall which is rational designed will improve the seepage state of levee projects effectively.
合理设计的防渗墙能有效地改善堤防工程的渗流状态，是最为有效的防渗处理方法。