管道过滤器在运行过程中必须定期停车清洗、排污，往往影响系统设备长周期运行。
The pipe filter must be shut down for cleaning and drainage regularly during its operation, and this usually interferes with the long-period operation of the equipment in the system.
混凝土涵洞，雨水沟，排污沟系统的最低成本(使用周期)的标准规范。
Standard Practice for Least Cost (Life Cycle) Analysis of Concrete Culvert, Storm Sewer, and Sanitary Sewer Systems.
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