IMPACT OF ATMOSPHERIC PRECIPITATION ON THE VARIABILITY OF WASTEWATER DISCHARGE FROM A SELECTED SEWAGE SYSTEM IN JAWORZNO

Abstract

Aim of the study The present paper analyses the influence of atmospheric precipitation on the variability of wastewater discharge from a selected sewerage system located in southern Poland. The research period covered the years 2011–2016. The daily outflows of wastewater from the sewerage system were adopted. Material and methods Precipitation data were obtained from a station located 7 km away from the tested facility (the nearest rainfall measurement station from the tested object) and based on this data, the mean daily precipitation values were determined for the examined period. Subsequently, the research period was divided, according to the amount of precipitation, into 7 basic groups. It was determined whether the mean values of wastewater discharge from the sewerage system in particular groups of rainfall intensity significantly differed from each other. The analysis was carried out using a one-way analysis of variance (ANOVA). The groups of rainfall intensity constituted the factor determining the value of wastewater outflow from the sewage agglomeration. Results and conclusions Based on the results of the research we conducted, actions were proposed aimed at increasing the control of accidental water outflow to the sewerage system. Based on that, operations have been determined, minimizing the inflow of accidental rainwaters to particularly sensitive sections of the sewerage system. Training should be provided for municipalities of the agglomeration, regarding the management of rainwater, so as to stop the inflow as far as possible, in the locations where it may arise.