Analysis of the impact of the degree of catchment sealing on the operation of drainage system

Abstract

Abstract With increasing sealing of the catchment surface, the time of outflow of water from the catchment decreases and the volume of surface water flowing out increases. This phenomenon has a negative impact on the water balance of the catchment area, and results in an increase in the frequency of flooding, related to inability of the existing drainage systems to collect the surface waters. This paper presents the results of modeling of hydraulic conditions in a selected part of the storm sewage system. The US EPA’s software SWMM 5 was applied to our studies. Three different rainfall events of various intensity and time and variable sealing degree of the catchment surface were studied in our research. The conducted simulation tests enabled the analysis of the sewage flow rate, the canals filling height as well as assessment of the impact of changing the degree of surface sealing on the amount of rainwater discharged and the frequency of outflows.

Keywords

• Stormwater drainage system
• SWMM
• Quantitative analysis of rainwater
• Sealing the catchment area