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Related Experiment Video

Updated: Jun 11, 2026

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

Published on: November 20, 2014

Groundwater intrusion into leaky sewer systems.

H Wittenberg¹, H Aksoy

¹Fakultät III, Umwelt und Technik, Leuphana Universität Lüneburg, Suderburg, Germany. wittenberg@uni.leuphana.de

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

|July 3, 2010

Summary

Urban sewer systems capture significant groundwater. This study quantifies groundwater intrusion using a nonlinear reservoir algorithm, revealing seasonal variations and recession patterns similar to river baseflow.

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Area of Science:

Environmental Engineering
Hydrology
Urban Water Management

Background:

Urban sewer systems collect substantial volumes of groundwater due to leaks and connected drains.
This intruded groundwater exhibits seasonal variations and slow recessions, mirroring natural baseflow dynamics in rivers.

Purpose of the Study:

To apply a nonlinear reservoir algorithm for separating groundwater flow from total influents in wastewater treatment plants.
To analyze the seasonal variations and recession characteristics of intruded groundwater in sewer systems.
To establish a method for quantifying and predicting groundwater intrusion into urban sewers.

Main Methods:

Utilized the nonlinear reservoir algorithm, commonly applied for baseflow separation in river systems.
Analyzed daily influent data from wastewater treatment plants in Germany and Turkey.
Correlated separated groundwater flow patterns with baseflow data from nearby rivers.

Main Results:

Successfully separated groundwater flow from wastewater influents.
Observed distinct seasonal variations and recession patterns in the separated groundwater flow.
Found correlations between intruded groundwater recession characteristics and river baseflow.

Conclusions:

Wastewater treatment plant influent recession characteristics can effectively quantify groundwater intrusion.
The nonlinear reservoir algorithm is a viable tool for analyzing groundwater infiltration in sewer systems.
Understanding these dynamics is crucial for effective urban water management and infrastructure maintenance.