Rainwater in municipal water supply systems
(a review)

Summary

In countries that suffer from the scarcity of water resources rainwater has been an alternative water supply source for many years. At present rainwater collection, purification and use for domestic purposes (in toilets, laundry washers), for irrigation and landscape improvement, and also for drinking water supply is carried up to the state-of-the art. Herewith coping with the water resources scarcity is not the sole reason that stimulates the development of rainwater collection and use systems. In many countries well off for water resources the systems of rainwater collection and use are considered as the processes that provide for the sustainable operation of the municipal sewerage by reducing and equalizing the frequency, peaks and volumes of storm water entering it. Branching and increasing the capacity of storm water sewers by the use of rainwater retention tanks provide for the reduction of the storm sewer loading and anthropogenic impact on the water bodies that receive effluents. This approach within the frames of the water industry development concept based on the decentralized processing of different wastewater types is on a par with the schemes of grey and black wastewater treatment and reuse.

Ключевые слова

rain water , collection system , chemical pollution , microbiological pollution , public water supply , storm sewer

Overview of the main amendments to the Code of Practice CP 32.13330.2018 «Sewerage. Pipelines and wastewater treatment plants» in terms of designing the systems for the disposal and treatment of surface runoff introduced in 2021

Summary

An overview of the main changes in the design of the systems for the disposal and treatment of surface runoff (rain, melt water) in the current set of rules – CP 32.13330.2018 «SNiP 2.04.03-85 Sewerage. Pipelines and wastewater treatment plants», developed in 2021 by the specialists of the Research Institute of Building Physics of the Russian Academy of Architecture and Building Sciences and a number of other organizations is presented. It is noted that the purpose of amending the current regulatory document is, in particular, harmonization of its provisions with the articles of the environmental legislation that came into force on January 1, 2019 and the new regulatory legal acts of the Government of the Russian Federation that provide for the transition to the principles of technological regulation of discharges in accordance with the technological indicators of the best available technologies. An overview of the most significant changes in CP 32.13330.2018 on the organization and calculation of the systems for the disposal and treatment of surface runoff is given.

Key words

treatment facilities , best available techniques , discharge limitations , surface runoff , technological indicators , storm sewer , hydraulic calculation of networks , separation chamber , intermediate storage tank , climatic parameters , rainfall intensity