Impact of atmospheric precipitation on the volume of wastewater inflowing to the treatment plant in Nowy Targ

Department of Sanitary Engineering and Water Management University of Agriculture in Kraków, Mickiewicza 24/28, 30-059 Kraków, Poland

^* Corresponding author: p.bugajski@urk.edu.pl

Abstract

The study determines the impact of precipitation on the amount of wastewater flowing into the treatment plant in Nowy Targ. The research period covered the years 2016 and 2017, in which the amount of precipitation and average daily wastewater inflows (during the so-called dry period, i.e. days without precipitation and in the so-called wet period, i.e. days with precipitation) were analyzed. The research period was divided into 5 characteristic ranges in terms of the amount of precipitation. It was found that on days with different intensity of precipitation, the amount of rainwater (in the total amount of wastewater flowing into the treatment plant) ranges from 14.2% to 32.5%. Taking into account the absolute values, it was found that the average daily amount of wastewater inflow on days with precipitation was from 14361 to 18248 m³∙d^-1 compared to wastewater inflow on days without precipitation (12323 m³∙d^-1). The obtained test results should be a signal for sewage network operators for the performance of intensive and effective actions aimed at eliminating illegal connections of drain pipe for rainwater and yard drains to sanitary collectors and the replacement combined sewer system to distribution sewer system in the city of Nowy Targ.