The aim of the study was to determine the volume of infiltration and inflow within a selected sanitary sewer system by using the moving minimum method. The examined sewer system is located in Kraków County, Lesser Poland Voivodeship. Parasite water inflow into the sewer system was studied in the multiannual period of 2008-2011. Based on the analysis of the research results, obtained using the moving minimum method, it was determined that the infiltration fraction in the annual inflow of contaminated water into the sewer system was from 19.0 to 20.7%, while the fraction of extraneous water - from 19.5 to 31.4%. The largest inflows of extraneous water in the analyzed multiannual period occurred in 2010 (30 210 m3). Due to high total annual precipitation this year was evaluated as very wet. The lowest inflows of extraneous water to the sewer system (15 053 m3) were observed in 2011 (extreme dry year). On the other hand, the largest inflow of infiltration water (20 675 m3) occurred in 2009 (dry year) and the lowest (14 805 m3) - in 2011. The performed research demonstrated a strong correlation between the annual amount of precipitation and the annual volume of parasite water flowing into ...
The aim of this study was the application of the triangle method for the calculation of the infiltration and inflow volume entering the sanitary sewer system operating in the Cracow County (Lesser Poland Voivodeship). The analyzed, 10 km long, sewer system is made of vitrified clay pipes with diameters of 200, 250 and 300 mm. Infiltration and inflow, also called extraneous water, adversely affect the operation of sewer systems and sewage treatment plants, what in turn may result in water contamination in the receiver. Amount of extraneous water in the inflows to sewer systems should be estimated using the available computational methods and their causes should be eliminated on an ongoing basis. The conducted study showed an alarming amount of extraneous water flowing into the analyzed sewer system, i.e. in 2010 it accounted for 41.1% (40033 m3), in 2011 - 28.7% (22224 m3), while in 2012 - 23.4% (16848 m3) of the total annual volume of polluted water. The volume of infiltration and inflow entering the examined sewer system depended primarily on the frequency of precipitation, and - to a lesser extent - on its annual total amount. Illegal connections of yard inlets or gutters to the sewage drains are ...
