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Exfiltration from gravity sewers: a pilot scale study.

J Vollertsen¹, T Hvitved-Jacobsen

¹Department of Environmental Engineering, Institute of Life Sciences, Aalborg University, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark. jv@civil.auc.dk

Water Science and Technology : a Journal of the International Association on Water Pollution Research

|April 2, 2003

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Wastewater exfiltration from gravity sewers stabilizes over time due to clogging, forming a leakage factor. This factor helps estimate groundwater pollution risks from sewer networks.

Area of Science:

Environmental Engineering
Wastewater Management
Soil Science

Background:

Wastewater exfiltration from gravity sewers is a critical environmental concern.
Understanding exfiltration dynamics is key to assessing groundwater pollution risks.

Purpose of the Study:

To investigate wastewater exfiltration rates from sewer leaks.
To determine factors influencing exfiltration and develop a predictive parameter.

Main Methods:

Conducted pilot-scale experiments simulating storm events, pipe flushing, and alternating infiltration/exfiltration.
Studied exfiltration through various sewer leak types and into different soil matrices.

Main Results:

Exfiltration rates stabilized after several days, remaining constant throughout the study period.

Related Experiment Videos

A clogging zone developed at the sewer leak, governing the exfiltration rate.

A 'leakage factor' was identified to characterize exfiltration behavior.

Conclusions:

The developed leakage factor provides a method for estimating groundwater pollution risk from sewer networks.
Sewer exfiltration is a predictable process influenced by clogging dynamics.