The drain pipe jointing material of cement mortar with addition of water glass can effectively overcome the influence of groundwater and improve the quality of the joints.

在水泥砂浆中掺入水玻璃作为排水管的接口材料，能有效克服地下水影响，提高了接口工程质量。

youdao

In the meantime the time variation of the water level in the ditch has been taken into account, therefore the groundwater head are time-varying as the groundwater flows toward the drain system.

在讨论这个问题时，又考虑进了排水沟中的水位也是随时间而变化的，因此在地下水流动过程中的任一瞬时，其地下水头差也是一个变量。

youdao

The groundwater in Karst spring basin has a characteristic of concentration drain, it is similar to unsteady orifice outflow in fluid mechanics.

岩溶泉域地下水具有集中排泄的特点，它类似于流体力学中的非恒定孔口出流。

youdao

This genetic analysis saved millions of gallons of groundwater that otherwise would have had to go down the drain.

FORBES: Guest post written by Aaron Peacock