Abstract
Infiltration and inflow (I/I) of unwanted water in separate urban sewer networks are critical issues for sustainable urban water management. Accurate quantification of unwanted water I/I from individual sources into a sewer system is an essential task for assessing the status of the sewer network and conducting rehabilitation measures. The study aim was to quantify extraneous water I/I into a sanitary sewer network by a temperature-based method, i.e., fiber-optic distributed temperature sensing (DTS), which was applied for the first time in a separate sewer network of a catchment in Trondheim, Norway. The DTS technology is a relatively new technology for sewer monitoring, developed over the past decade. It is based on continual temperature measurement along a fiber-optic cable installed in the sewer network. The feasibility of this method has been tested in both experimental discharges and for the rainfall-derived I/I. The results achieved from the monitoring campaign established the promising applicability of the DTS technique in the quantification analysis. Furthermore, the application of this method in quantifying real-life, rainfall-derived I/I into the sewer system was demonstrated and verified during wet weather conditions.
Highlights
Urban sewer systems are one of the most important city lifelines, conveying wastewater and stormwater to treatment plants
To test the feasibility of distributed temperature sensing (DTS) technology in quantifying the volume of extraneous water Infiltration and inflow (I/I) into the sewer system, a number of experimental artificial discharges with different temperatures, flows, and velocities were spilled into the sewer network of Lykkjbekken catchment (Table 1)
The applicability of the DTS technology was examined for quantification of the extraneous water I/I into the sewer system
Summary
Urban sewer systems are one of the most important city lifelines, conveying wastewater and stormwater to treatment plants. Representing a high asset value [1], urban sewer systems in most cities all over the world are undergoing deterioration due to aging [2]. Accurate monitoring, maintenance and rehabilitation are necessary for their preservation. Their underground location makes it difficult to monitor and understand their status. Infiltration and inflow (I/I) of unwanted water into separate sewer networks are significant challenges in urban sewer systems. Answering questions about location and magnitude of unwanted water intrusion is essential for understanding the sewer network performance for sustainable urban water management
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