Modelling the relationship between LID practices and the runoff of rainwater through the example of rainfall data for Krakow

Joanna Bąk

doi:10.1051/e3sconf/20184500008

Abstract

The progressing process of urbanization causes areas that were once previously green to turn into areas with a high rate of runoff. For this reason, all activities aimed at the alternative management of rainwater in the city are extremely important. The aim of the work is to compare the share of rainwater management in urban catchments to various alternative forms of management of these waters (including rain gardens and green roofs). The paper compares the outflows from the sample catchment with different runoff coefficients and after the implementation of various Low Impact Development (LID) practices to the catchment. The calculations were carried out using the Storm Water Management Model (SWMM) program version 5.1.012 with LID controls developed by the United States Environmental Protection Agency (US EPA). The rainfall data used to carry out the simulation was derived over the last three years from the meteorological station in Krakow.

Highlights

The progressive process of urbanization results in the size of impervious areas in settlement units significantly increasing
The study showed what impact the introduction of Low Impact Development (LID) practices could have on the existing impermeable catchment
It was confirmed in the simulations that LID practices have an essential impact on the rainwater runoff from the catchment and the parameters of functioning of the sewage system

Summary

Introduction

The progressive process of urbanization results in the size of impervious areas in settlement units significantly increasing. This means an increase in the runoff coefficient. Climate change is taking place in the world, the effects of which are noticeable in cities. The document [1] presents an analysis of trends in climate change in Poland by 2030. Taking into consideration the expected spatial diversification of the climatic conditions in Poland, it should be noted that an increase in the frequency of downpour rains (> 20 mm/day) in southern Poland should be expected [1]

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