By controlling the range of the dry density, magnitude of cement and water cement ratio of mixture, the requirement of drainage property and structure strength can be fulfilled.
通过控制混合料的干密度、水泥用量和水灰比的取值范围，可使混合料同时满足排水性能要求和结构强度要求。
2
The material requirement, main equipment and work conditions are indicated for brushing of drainage pipeline.
指出涂刷排水管道的材料要求、主要机具及作业条件。
3
Drainage basin characteristics values are the basic factors to account design flood, so correctly computing their values are requirement for improving design flood precision.