Culvert and horizontal pipes and spillway with hatch control need management of person specially assigned when flood is discharged.
涵、卧管和有闸门控制的溢洪道，在泄洪运行时需要专人管理；
2
The text introduces the process control of culvert construction to ensure engineering quality.
介绍了涵洞施工的工序控制，以确保涵洞工程质量。
3
The paper analyzes the factors causing the cracks happened during highway culvert pipe precasting, and brings forward the control measures accordingly.