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Case Report

Assessment of Infiltration from Private Sewer Laterals: Case Study in Jurmala, Latvia

Water Research and Environmental Biotechnology Laboratory, Faculty of Civil Engineering, Riga Technical University, Ķīpsalas iela 6A-263, LV-1048 Rīga, Latvia
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Academic Editor: Fernando António Leal Pacheco
Water 2022, 14(18), 2870; https://doi.org/10.3390/w14182870
Received: 8 August 2022 / Revised: 1 September 2022 / Accepted: 13 September 2022 / Published: 14 September 2022
(This article belongs to the Section Urban Water Management)
The presence of excess water in centralized sewerage systems is known to have a multitude of unfavorable effects on the daily operation of the wastewater infrastructure. The additional volume of I/I-water decreases the hydraulic capacity of wastewater collection networks, reduces the efficiency of wastewater treatment processes, and increases the costs of transporting and treating the wastewater. Currently, most I/I studies in Latvia are conducted on the scale of the wastewater treatment plant service area and determine only the common performance indicators for a given year. However, data of such resolution are not sufficient to identify problem areas within the networks and to introduce cost-effective measures. The contribution of private sewer laterals to the overall I/I volume is an area of particular interest. Although it is possible to locate and quantify I/I from individual house connections, in practice, given the financial and time constraints, it is not feasible to apply a case-by-case approach. Thus, a simple method to predetermine the problematic parts of the system before conducting on-site inspections is needed. This study investigates the link between groundwater levels and observed night-time wastewater flows on a sub-catchment scale by performing a linear regression analysis (940 data points in total). The results show a direct correlation (R > 0.70 in all cases) between said parameters and highlight the impacts of poorly built and ill-maintained house connections. The presented approach can be widely adopted by system operators to help identify potential sources of diluted wastewater and to aid in the development of priority-based renovation plans. View Full-Text
Keywords: infiltration/inflow; excess water; groundwater; house connections; laterals; private sewers; regression analysis infiltration/inflow; excess water; groundwater; house connections; laterals; private sewers; regression analysis
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MDPI and ACS Style

Dakša, G.; Dejus, S.; Rubulis, J. Assessment of Infiltration from Private Sewer Laterals: Case Study in Jurmala, Latvia. Water 2022, 14, 2870. https://doi.org/10.3390/w14182870

AMA Style

Dakša G, Dejus S, Rubulis J. Assessment of Infiltration from Private Sewer Laterals: Case Study in Jurmala, Latvia. Water. 2022; 14(18):2870. https://doi.org/10.3390/w14182870

Chicago/Turabian Style

Dakša, Gints, Sandis Dejus, and Jānis Rubulis. 2022. "Assessment of Infiltration from Private Sewer Laterals: Case Study in Jurmala, Latvia" Water 14, no. 18: 2870. https://doi.org/10.3390/w14182870

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