What does it mean to mark the elevation hw, hd, he, hn and hs on municipal drainage engineering paper?

Hs refers to the design elevation. Hd is the corresponding ground elevation. HT, AT, HW and AW represent fill height, fill area, excavation height and area respectively. Generally, H stands for height, A stands for area, and subscripts W and T stand for digging and filling respectively.

Extended data:

In water supply and drainage engineering drawings, abbreviations have the following meanings:

Water supply pipeline -J, if divided into high and low areas, is usually represented by the initial letter, that is, high area -G and low area-d.

Drain pipe -W, which means sewage. And -F, it's wastewater. Rarely use-p.

Fire hydrant pipe -XH.

Automatic sprinkler -Z or -ZP.

Rainwater pipe-y.

Heating pipe -R, generally the solid line indicates the water supply pipe, and the dotted line indicates the return pipe.

Pressure drainage.

Condensing water pipe -n

Riser -l

In addition, the model letter of the equipment: Q- flow or air volume H- lift N- power P- pressure QW- submersible sewage pump and other valves and appliances are distinguished by graphics.

JL- water supply pipeline; WL- sewage pipe; YL- rainwater pipe; RJL- hot water supply; RHL- hot backwater.