Rainwater management by “green” roofs on the example of trade-business centre “Perekhrestia”, Dnipro city

Abstract

The densification of urban building causes the replacement of urban green areas with negative environmental impact. Therefore, it is necessary to move to the concept of combining living plants with building structures. The concept of green construction is a universal approach that allows not only to reduce the negative impact of construction on the environment but on the contrary, to ensure a positive impact on the environment. This concept can be applied at all levels – from a single building to neighborhoods or settlements. One of the serious problems of cities is the management of stormwater runoff. They carry trash, bacteria, heavy metals and other pollutants through storm drains into local waterways. The most common means of managing urban runoff are storm sewer systems, which have the conventional name of "grey infrastructure." These systems are ageing and require expensive repairs. Due to climate change, the amount of runoff is increasing, which leads to exceeding the carrying capacity of the systems. The development of territories significantly disrupts the water balance. The sponge city allows effective solving of these problems thanks to the maximum approach of the functioning of built-up areas to unbuilt ones. In this work, a "green" roof is being developed on the roof of the "Perekhrestia" shopping and business center in Dnipro city. To do this, the volume of precipitation in the city for 2022 was analyzed. The "Roof Garden" system from the Zinko-Ukraine company was adopted. This system currently has a margin of 50% retention of precipitation falling on green areas. To dispose of water from pedestrian areas, it is necessary to install water storage tank(s). It is advisable to use this water for watering green areas or for toilet needs. Two toilets in the public toilet ensure the emptying of the tank(s) in 15 days. Increasing the number of sanitary devices simplifies the water supply system and increases the resilience of objects to climate change.