Summarized data is presented on the maximum rainfall layer, runoff from which should be completely diverted to treatment facilities (runoff from residential areas and industrial enterprises of the first group in the Russian Federation). The calculated values of the precipitation layer are obtained from observations at 238 weather stations located in the Russian Federation, which are necessary for calculating the performance of surface water treatment plants. The results can be used in the design in areas for which these weather stations are representative. The size of the precipitation layer, which ensures the discharge of at least 70% of the annual volume of runoff to sewage treatment plants, for the territory of the Russian Federation is in the range of 2.2–12.8 mm.
Data on the maximum layer of precipitation for rain, the drain from which is allocated to treatment facilities from the territories of industrial enterprises in the conditions of the Russian Federation, are presented. The results are analysed and summarized. The average layer of precipitation with a period of single excess equal to 1 year according to 195 weather stations is determined. The average precipitation layer for the entire area under consideration was 27.8 mm, with a variation range of 12.3 to 72.0 mm. The obtained parameters are intended and can be used for design of surface runoff treatment facilities.
The paper considers the features of the transition to a new system of rationing of surface wastewater discharges. The basic legislative requirements are given, the required degree of purification is calculated, which ensures the achievement of technological standards. The possible lists of substances for goals calculating the specifications of permissible dump are given. The necessity of entering additional information into technical standards for the ensure system of rationing of surface wastewater discharges at the design and construction stage is substantiated.
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