Perm rainwater drainage system: development trends
Based on the analysis of the project documentation, the provision of various districts of Perm with networks and facilities for drainage and treatment of surface water is revealed. A fairly extensive network of rain sewers covers the administrative Leninsky district as well as the central parts of the Sverdlovsky and Industrial districts. In the parts covering the city center in the form of a half-ring (“from the Kama to the Kama”), only a few large residential areas are locally covered by branched networks. The rain sewer of the peripheral urban areas such as Molodezhny, Golovanovo, Vyshka-2 and others, is represented mainly by single sewers along the main streets. On the outskirts, in the old and new building zones the rain drainage system is almost absent at the moment. Nearly all rainwater from Perm is discharged into the Kama river or its tributaries without any treatment; so far only 15 local surface wastewater treatment plants are operating or under installation. There is a need for laying additional rain sewers of large diameters (500-1200 mm) in different parts of the city, including the central streets, where the existing sewers are not able to cope with the flow of rainwater. The existing surface water treatment plants in Perm operate according to the traditional scheme "mud traps-oil traps". Along with the improvement of traditional schemes, it is necessary to develop new types of treatment facilities, for example, phytofilters for soil surface water treatment and compact filters built into rain wells. The results of the project study wereused to design a specific object - the rain network and treatment facilities for surface runoff from the 21-hectare housing estate in the Sverdlovsky district of Perm.