SHANGYu,GUANYuxi,FANGZheng,et al.Drainage Capacity of Building Drainage System under Submerged Discharge Conditions[J].China Water & Wastewater,2026,42(1):112-116.
Drainage Capacity of Building Drainage System under Submerged Discharge Conditions
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第1期
Page:
112-116
Column:
Date of publication:
2026-01-01
- Keywords:
- building drainage system; submerged discharge; drainage capacity; variation of pressure; loss of water seal
- Abstract:
- Under conditions of heavy rainfall, the liquid level in the rainwater manhole rises, potentially resulting in submergence of the terminal section of the building’s drainage pipe. The drainage capacity of building drainage systems was investigated under both conventional and submerged discharge conditions, based on three configurations: the common combined double vent stack system, the anti- backflow H-shape double vent stack system, and the circular double vent stack system. Submerged outflow significantly reduced the drainage capacity of the building drainage system. Nevertheless, the circular double vent stack system could still maintain a flow rate of up to 6.0 L/s. It is recommended to avoid submerged discharge conditions to the greatest extent possible in project design. If the drainage pipe outlet of the building is located at a relatively low elevation, a ventilation system should be installed.
Last Update:
2026-01-01