Program for determining the calculation of rain runoff. Projects of apartment buildings. Hotel projects. Low-rise building. Projects of private houses. Architecture. Design. We select the estimated diameter of the pipe in front of the tank and treatment facilities

First in the world online wastewater calculator presented on our website. The calculator is based on SNIP 2.04.03-85 dated 01.01.1986 — « BUILDING REGULATIONS. Sewerage. External networks and structures”.
Thanks to our specialists who have automated the process wastewater calculation, planners and supply managers can save valuable time when calculating rainwater volume and annual surface runoff.
In addition, the calculator automatically selects the appropriate one from the OZON product catalog!

take advantage wastewater calculator can be found on any page of our site.

Surface runoff calculation

The calculation of surface runoff allows you to obtain accurate data necessary for ordering treatment facilities of the correct capacity. Thanks to the algorithm developed by us for calculating the volume of wastewater, the calculation is made in seconds.

Runoff calculation program

There are analogues of our program on the market. Unfortunately, competitors prefer to charge you to install their software, while our runoff calculator is completely free and accessible from any device.

Download SNIP 2.04.03-85

For the convenience of our users, we also post the full text of SNIP 2.04.03-85 dated 01.01.1986 — « BUILDING REGULATIONS. Sewerage. External networks and structures!

MINISTRY OF CONSTRUCTION AND HOUSING AND UTILITIES OF THE RUSSIAN FEDERATION

ORDER

In accordance with paragraph 25 of the Rules for the organization of commercial accounting of water, wastewater, approved by Decree of the Government of the Russian Federation of September 4, 2013 N 776 (Collected Legislation of the Russian Federation, 2013, N 37, art. 4696; 2014, N 14, art. 1627) , subparagraph 5.2.73 of paragraph 5 of the Regulations on the Ministry of Construction and Housing and Communal Services of the Russian Federation, approved by Decree of the Government of the Russian Federation of November 18, 2013 N 1038 (Collected Legislation of the Russian Federation, 2013, N 47, art. 6117, 2014, N 12 , art. 1296),

I order:

1. Approve the attached Guidelines for calculating the volume of accepted (discharged) surface wastewater.

2. The control of the execution of this order shall be entrusted to the Deputy Minister of Construction and Housing and Communal Services of the Russian Federation A.V. Chibis.

Minister
M.A. Men

Registered
at the Ministry of Justice
Russian Federation
February 24, 2015
registration N 36194

Guidelines for calculating the volumes of accepted (discharged) surface wastewater

APPROVED
by order
Ministry of Construction
and housing and communal services
Russian Federation
dated October 17, 2014 N 639 / pr

I. General provisions

1. These Guidelines for calculating the volumes of accepted (discharged) surface wastewater (hereinafter referred to as the Guidelines) determine the procedure for the commercial accounting of surface wastewater (hereinafter also referred to as runoff) accepted (discharged) into the centralized sewage system.

2. These Guidelines do not consider cases of water entering centralized sewerage systems during rising water levels (floods) in water bodies near which centralized sewerage systems are located; water used for washing and disinfection of networks after the liquidation of accidents; water from leaks from water supply networks and heat supply networks; water entering the centralized drainage system from snow melting points as a result of forced snow melting carried out at such points.

II. Features of receipt and calculation of precipitation volumes

3. Precipitation:

- discharged to centralized drainage systems in the form of rain, melted water, infiltration water (ground (underground) water entering the centralized drainage systems in the absence of drainage connections, through leaks, leaky connections of elements, cracks and holes formed both during the operation of existing sewer networks , and during the construction of new networks), as well as drainage water (ground (underground) water entering the centralized wastewater systems when drains are connected to them);

- are spent in the form of moisture for evapotranspiration (total moisture consumption for transpiration (evaporation of water by a plant) and evaporation (evaporation from the soil surface);

- come unorganized into water bodies, to the lower horizons of groundwater.

4. The amount of precipitation (daily, monthly, seasonal and annual layers), information on temperature, air humidity are determined according to information received from the Federal Service for Hydrometeorology and Environmental Monitoring, including in the form of data from the Unified State Data Fund on the state environment, its pollution, other organizations licensed to carry out activities in the field of hydrometeorology and related fields (including monthly average data for the last 3 years), or in accordance with building climatology standards. In case of discrepancy between the data obtained from the above sources, the data obtained from the Unified State Data Fund on the state of the environment and its pollution are used.

________________

5. When determining the volume of rainwater, the amount of precipitation falling during the warm period of the year (from April to October) is taken into account; when determining the volume of melt runoff, the amount of precipitation falling during the cold period of the year (from November to March) is taken into account.

6. If it is necessary to determine the forecast volumes of surface runoff (to determine the price of a sewerage agreement, form an income plan, balance calculations of sewerage), it is recommended to take a layer of precipitation (the amount of precipitation per calendar month or other period of time, expressed as a layer (in mm ), evenly distributed over the area), corresponding to the annual layer of 20% probability (probability of occurrence of a phase-homogeneous runoff equal to or greater than the specified value):

N os \u003d Nose * K, (m / year, m / month),

K - coefficient taking into account the ratio of the annual amount of precipitation of 20% of the provision to the average annual amount of precipitation. K = 1.07.

Nos - the average annual amount of precipitation, determined from information received from the Federal Service for Hydrometeorology and Environmental Monitoring, including data from the Unified State Data Fund on the state of the environment, its pollution, other organizations licensed to operate in in the field of hydrometeorology and related areas (including monthly average data for the last 3 years), or in accordance with the standards for building climatology.

________________

Section II of the Administrative Regulations for the Federal Service for Hydrometeorology and Environmental Monitoring to perform the state function of ensuring the functioning of hydrometeorological observation points and the system for receiving, collecting and distributing hydrometeorological information on the territory of the Russian Federation, approved by order of the Ministry of Natural Resources and Ecology of the Russian Federation dated October 31, 2008 N 299 (Bulletin of Normative Acts of the Federal Executive Bodies, N 7, February 16, 2009, registered with the Ministry of Justice of the Russian Federation on December 17, 2008, registration N 12879).

Order of the Federal Service for Hydrometeorology and Environmental Monitoring dated April 24, 2008 N 144 "On approval of the Administrative Regulations of the Federal Service for Hydrometeorology and Environmental Monitoring for the performance of the state function "Maintaining the Unified State Data Fund on the state of the environment, its pollution" (Bulletin of regulatory acts of federal executive bodies, N 38, September 22, 2008, registered with the Ministry of Justice of the Russian Federation on May 23, 2008, registration N 11742).

7. In the absence of data on the layer of actual precipitation for a particular settlement, as well as in the case of several observation posts of the state observation network (or a departmental observation network designed to determine the actual amount of precipitation in one settlement), data on the actual precipitation atmospheric precipitation are received from the observation network post closest to the center of the settlement. Data on actual precipitation can be taken as a single value for the entire settlement or determined for each specific land plot (territory) by linking it (her) to the nearest observation network post.

8. Water supply and sewerage organizations that operate centralized sewerage systems, in settlements with subscribers, when determining the volume of surface runoff for a calendar month, use information on the actual layer of precipitation received from the Federal Service for Hydrometeorology and Environmental Monitoring, including in the form data from the Unified State Data Fund on the state of the environment, its pollution, other organizations licensed to carry out activities in the field of hydrometeorology and related fields (including monthly average data for the last 3 years), or data from building climatology standards .

________________

Section II of the Administrative Regulations for the Federal Service for Hydrometeorology and Environmental Monitoring to perform the state function of ensuring the functioning of hydrometeorological observation points and the system for receiving, collecting and distributing hydrometeorological information on the territory of the Russian Federation, approved by order of the Ministry of Natural Resources and Ecology of the Russian Federation dated October 31, 2008 N 299 (Bulletin of Normative Acts of the Federal Executive Bodies, N 7, February 16, 2009, registered with the Ministry of Justice of the Russian Federation on December 17, 2008, registration N 12879).

Order of the Federal Service for Hydrometeorology and Environmental Monitoring dated April 24, 2008 N 144 "On approval of the Administrative Regulations of the Federal Service for Hydrometeorology and Environmental Monitoring for the performance of the state function "Maintaining the Unified State Data Fund on the state of the environment, its pollution" (Bulletin of regulatory acts of federal executive bodies, N 38, September 22, 2008, registered with the Ministry of Justice of the Russian Federation on May 23, 2008, registration N 11742).

9. For water supply and sewerage organizations that operate only centralized storm water disposal systems, when calculating with subscribers, the volume of surface runoff for a calendar month is allowed to be calculated from the average annual precipitation as 1/12 of the average annual volume of surface runoff.

10. From the catchment area of ​​land plots (territories) adjacent to water bodies that are not included in the zone of centralized drainage of surface wastewater (the territory determined taking into account the location of storm water inlets, sewer networks and the terrain from which surface wastewater is discharged into a centralized system drainage), an area 50 meters wide along the coastline of the land plot (territory) should be excluded, since surface runoff from this surface does not enter the centralized sewerage systems.

11. If there are on-site sewer networks, the entire territory used by the subscriber is recognized as being in the zone of centralized surface sewage disposal.

12. In the absence of approved zones of centralized sewage disposal of surface wastewater, defined in the scheme of water supply and sanitation, the area of ​​land plots (territories) of subscribers, the surface runoff from which flows unorganized into centralized sewerage systems, can be determined taking into account the vertical layout of the sewered territory (the area of ​​the land plot (territories), the possession, use or disposal of which is carried out by the subscriber, located in the zone of centralized drainage of surface wastewater, the surface runoff from which enters the centralized drainage system), subject to the provision of maps of land plots (territories) to the water supply and sewerage organization on a scale M 1:500, made by an organization licensed for geodetic and cartographic work, indicating the boundaries, types of surfaces, with the application of all water-bearing communications and marks on the level of ground one.

13. Territories that are not formalized in the established manner as a land plot, the surface runoff from which enters the centralized sewerage systems, can be determined on the basis of geoinformation systems data on the sewer area, taking into account the location of the land plots relative to the centralized sewerage systems (on-site sewer networks) within the shortest distance of 50 meters in both directions from the drainage system (sewer network).

III. Calculation of the volumes of accepted (diverted) surface wastewater

14. Surface wastewater (W ps) accepted into centralized sewerage systems includes rainwater, melt, groundwater (infiltration, drainage) and watering wastewater

W ps \u003d W d + W t + W gr + W m, (m)

W d - volumes of rain runoff, (m)

W t - volumes of melt runoff, (m)

W gr - volumes of groundwater W gr = (W inf + W dr),

W inf - volumes of infiltration runoff, (m)

W dr - volumes of drainage flow, (m)

W m - volumes of watering runoff, (m)

15. The calculation of the volume of rain runoff is made according to the formulas:

Average annual rainfall:

W \u003d 10 * H * F * avg d, (m / month)

Monthly rainfall:

W \u003d 10 * H * F * avg, (m / month)

Actual annual rainfall:

W \u003d W, (m / year)

where:

W , W - average annual and actual annual volume of rain runoff, respectively,

H - the average annual layer of atmospheric precipitation for the warm period of the year (April - October, rain layer), (mm),

H - atmospheric precipitation layer by months of the warm period (April - October, rain layer), (mm).

When determining the actual volume of rainwater, the amount of atmospheric precipitation is taken according to information received from the Federal Service for Hydrometeorology and Environmental Monitoring, including in the form of data from the Unified State Data Fund on the state of the environment, its pollution, and other licensed organizations to carry out activities in the field of hydrometeorology and related areas (including monthly average data for the last 3 years) or in accordance with the standards for building climatology.

________________

Section II of the Administrative Regulations for the Federal Service for Hydrometeorology and Environmental Monitoring to perform the state function of ensuring the functioning of hydrometeorological observation points and the system for receiving, collecting and distributing hydrometeorological information on the territory of the Russian Federation, approved by order of the Ministry of Natural Resources and Ecology of the Russian Federation dated October 31, 2008 N 299 (Bulletin of Normative Acts of the Federal Executive Bodies, N 7, February 16, 2009, registered with the Ministry of Justice of the Russian Federation on December 17, 2008, registration N 12879).

Order of the Federal Service for Hydrometeorology and Environmental Monitoring dated April 24, 2008 N 144 "On approval of the Administrative Regulations of the Federal Service for Hydrometeorology and Environmental Monitoring for the performance of the state function "Maintaining the Unified State Data Fund on the state of the environment, its pollution" (Bulletin of regulatory acts of federal executive bodies, N 38, September 22, 2008, registered with the Ministry of Justice of the Russian Federation on May 23, 2008, registration N 11742).


When determining the predicted volume of rain runoff, the value of the atmospheric precipitation layer is taken equal to 20% of the probability.

F - the area of ​​the land plot (territory) owned by the subscriber, from which surface wastewater is discharged into the centralized sewage system, including unorganized discharge of surface wastewater (discharge into the centralized wastewater disposal system of rain, melted snow and irrigation water outside the territories of subscribers and other persons with their subsequent entry along the natural slope of the terrain into the centralized sewerage system or into a water body, including through the canalized territories of other subscribers), (ha);

av d is the weighted average value of the runoff coefficient (the ratio of the volume of surface runoff on the catchment surface to the total volume of precipitation that fell during the calculation period (per day, month, year) in a given territory) for areas with different types of coatings;

avg d \u003d (Fi * i) / F, (calculation is made for territories with different types of surfaces),

where:

F i, (ha) - the sum of areas with different types of surfaces. Data on the breakdown of the territory by types of surfaces are accepted on the basis of a subscriber's certificate or according to inventory data.

i - coefficient of rain runoff for different types of surfaces is taken into account the permeability of the surface, including:

roofs and asphalt concrete pavements - 0.7;

pavement and cobblestone pavements - 0.5;

ground surfaces - 0.2;

lawns - 0.1.

16. The calculation of the volume of melt runoff is made according to the formulas:

Average annual melt runoff

W \u003d 10 * H * F * t * Ku, (m / year.),

Monthly volume of melt runoff

W \u003d 10 * H * F * t * Ku, (m / month),

Actual annual melt runoff

W \u003d W, (m / year),

where:

W , W - average annual and actual annual volume of melt runoff, respectively;

H , (mm) - atmospheric precipitation layer in the cold season (November - March, thawed layer);

H, (mm) - atmospheric precipitation layer by months of the cold period (November - March, thawed layer).

When determining the actual volume of melt runoff, the amount of atmospheric precipitation is taken according to information received from the Federal Service for Hydrometeorology and Environmental Monitoring, including in the form of data from the Unified State Data Fund on the state of the environment, its pollution, and other licensed organizations to carry out activities in the field of hydrometeorology and related areas (including monthly average data for the last 3 years) or in accordance with the standards for building climatology.

________________

Section II of the Administrative Regulations for the Federal Service for Hydrometeorology and Environmental Monitoring to perform the state function of ensuring the functioning of hydrometeorological observation points and the system for receiving, collecting and distributing hydrometeorological information on the territory of the Russian Federation, approved by order of the Ministry of Natural Resources and Ecology of the Russian Federation dated October 31, 2008 N 299 (Bulletin of Normative Acts of the Federal Executive Bodies, N 7, February 16, 2009, registered with the Ministry of Justice of the Russian Federation on December 17, 2008, registration N 12879).

Order of the Federal Service for Hydrometeorology and Environmental Monitoring dated April 24, 2008 N 144 "On approval of the Administrative Regulations of the Federal Service for Hydrometeorology and Environmental Monitoring for the performance of the state function "Maintaining the Unified State Data Fund on the state of the environment, its pollution" (Bulletin of regulatory acts of federal executive bodies, N 38, September 22, 2008, registered with the Ministry of Justice of the Russian Federation on May 23, 2008, registration N 11742).


When determining the estimated volume of melt runoff, the value of the atmospheric precipitation layer is taken equal to 20% of the probability.

m - coefficient of melt runoff - 0.7.

Ku - coefficient taking into account partial removal and cleaning of snow.

The coefficient = 0.5 is applied to subscribers engaged in the cleaning of urban areas of the street and road network (for the area of ​​territories related to the street and road network). The coefficient = 0.8 is applied to all other subscribers (for the area of ​​territories from which snow removal is carried out).

17. The calculation of groundwater volumes is carried out as follows:

In the absence of results of actual measurements of drainage water inflows and initial data for calculating their costs and volumes, the total (total) volume of ground (drainage and infiltration) waters entering the drainage systems is determined.

W + W = Wg inf.other (m).

Taking into account climatic (air temperature, amount of precipitation by months) and other conditions, the distribution of Wdr by months may change. The monthly volume of drainage and infiltration waters can be taken according to the formula

The maximum daily volume of infiltration and drainage waters is taken as the average daily (in the corresponding month) with a coefficient = 1.1, taken according to Table No. 1.

Table No. 1.

Table N 1

The calculation of the volumes of infiltration and drainage flows (in the absence of data on the volumes of drainage flow) is made according to the formula:

W inf.other = 10 * N inf.other * F, (m/year),

W inf.other - annual volumes of infiltration and drainage flows entering the centralized water disposal systems;

F, (ha) - the area of ​​the land plot (territory) owned by the subscriber, from which surface wastewater is discharged into the centralized wastewater disposal system, including unorganized discharge of surface wastewater.

N inf.other = Hoc - Notv - Nisp, - Notv. t.ub. (mm/year)

a) Ninf.etc. - the annual layer discharged by the centralized drainage system in the form of drainage and infiltration waters.

H inf.dr values ​​are calculated by seasons (warm, cold):

b) H os - the annual layer of atmospheric precipitation is taken according to information received from the Federal Service for Hydrometeorology and Environmental Monitoring, including in the form of data from the Unified State Data Fund on the state of the environment, its pollution, and other organizations licensed to carry out activities in the field of hydrometeorology and related fields (including monthly average data for the last 3 years) or in accordance with building climatology standards.

________________

Section II of the Administrative Regulations for the Federal Service for Hydrometeorology and Environmental Monitoring to perform the state function of ensuring the functioning of hydrometeorological observation points and the system for receiving, collecting and distributing hydrometeorological information on the territory of the Russian Federation, approved by order of the Ministry of Natural Resources and Ecology of the Russian Federation dated October 31, 2008 N 299 (Bulletin of Normative Acts of the Federal Executive Bodies, N 7, February 16, 2009, registered with the Ministry of Justice of the Russian Federation on December 17, 2008, registration N 12879).

Order of the Federal Service for Hydrometeorology and Environmental Monitoring dated April 24, 2008 N 144 "On approval of the Administrative Regulations of the Federal Service for Hydrometeorology and Environmental Monitoring for the performance of the state function "Maintaining the Unified State Data Fund on the state of the environment, its pollution" (Bulletin of regulatory acts of federal executive bodies, N 38, September 22, 2008, registered with the Ministry of Justice of the Russian Federation on May 23, 2008, registration N 11742).

H os \u003d Hd + Ht, (mm / year).

Hd, (mm) - atmospheric precipitation layer for the warm period of the year (from April to October).

Нт, (mm) - atmospheric precipitation layer for the cold period of the year (from November to March).

c) H, - the volume of wastewater discharged by the centralized sewerage system per year: H \u003d H d + H t, (mm / year).

H d - the annual layer of the discharged rainwater is calculated by the formula: H d \u003d 0.1 * W d / F, (mm / year).

H t - the annual layer of the discharged melt runoff is calculated by the formula: H t \u003d 0.1 * W t / F, (mm / year).

d) H evap, - the annual layer of atmospheric precipitation for evaporation (physical evaporation and transpiration), H evap = H evap + H evap (mm/year).

Nsp, (mm/year) - layer of atmospheric precipitation for runoff evaporation (during the warm period), Nsp = Hsp. * Ke * K tr, (mm).

N evap, (mm/year) - layer of atmospheric precipitation for evaporation of runoff (during the cold period), when calculating the layer of atmospheric precipitation consumed for evaporation in the cold period, the coefficients of the screening effect and transpiration are taken equal to 1, that is, the layer for evaporation is equal to evaporation (the maximum possible evaporation under given meteorological conditions from a sufficiently moistened underlying surface (at an arbitrarily high rate of water supply to the evaporating surface))

N isp = Nisp., (mm)

H isp., (mm) - evaporation from a unit of unbuilt surface, depends on climatic conditions (average monthly air temperature).

Average temperatures for the months of the year, data on evapotranspiration are taken according to information received from the Federal Service for Hydrometeorology and Environmental Monitoring, including in the form of data from the Unified State Fund for Data on the State of the Environment, Its Pollution, and other licensed organizations to carry out activities in the field of hydrometeorology and related areas (including monthly average data for the last 3 years), or in accordance with the standards for building climatology.

It is allowed to take monthly layers of evaporation according to the table. N 2.

Average values ​​for temperatures not reflected in Table No. 2 are determined by interpolation, extrapolation.

________________

Section II of the Administrative Regulations for the Federal Service for Hydrometeorology and Environmental Monitoring to perform the state function of ensuring the functioning of hydrometeorological observation points and the system for receiving, collecting and distributing hydrometeorological information on the territory of the Russian Federation, approved by order of the Ministry of Natural Resources and Ecology of the Russian Federation dated October 31, 2008 N 299 (Bulletin of Normative Acts of the Federal Executive Bodies, N 7, February 16, 2009, registered with the Ministry of Justice of the Russian Federation on December 17, 2008, registration N 12879).

Order of the Federal Service for Hydrometeorology and Environmental Monitoring dated April 24, 2008 N 144 "On approval of the Administrative Regulations of the Federal Service for Hydrometeorology and Environmental Monitoring for the performance of the state function "Maintaining the Unified State Data Fund on the state of the environment, its pollution" (Bulletin of regulatory acts of federal executive bodies, N 38, September 22, 2008, registered with the Ministry of Justice of the Russian Federation on May 23, 2008, registration N 11742).

Table N 2

Table No. 2

N app = (N app. 1 + N app. 2 + N app. 3 + N app. 11 + N app. 12) - determined for the corresponding month,

N isp. 1 - evaporation for January,

N isp. 2 - evaporation for February,

N isp. 3 - evaporation for March,

N isp. 11 - evaporation for November,

N isp. 12 - evaporation for December.

N app = (N app. 4 + N app. 5 + N app. 6 + N app. 7 + N app. 8 + N app. 9 + N app. 10) - determined for the corresponding month,

N isp. 4 - evaporation for April,

N isp. 5 - evaporation for May,

N isp. 6 - evaporation for June,

N isp. 7 - evaporation for July,

N isp. 8 - evaporation for August,

N isp. 9 - evaporation for September,

N isp. 10 - evaporation for October

Ke - the coefficient of the screening effect (reflecting the degree of reduction of volatility by moisture-impervious coatings - asphalt, concrete, etc. coatings) depends on the building density (an indicator characterizing the intensity of use of territories).

The value of the correction factor Ke should be taken for the warm period.

Ke = 0.5 with a high degree of improvement (large and large cities);

Ke = 0.8 (medium and small cities).

K tr - Transpiration coefficient, taking into account the consumption of groundwater for transpiration by vegetation (used for the warm period).

K tr \u003d 1 + (0.45 * (f)) / ((1-p) * F),

f - area occupied by trees and shrubs (data are taken according to information from subscribers provided when concluding a wastewater disposal agreement);

p - building density (the value of p is allowed to be taken for large and large cities = 0.65, for medium and small cities = 0.38).

F - area of ​​the land plot (territory).

e) N.T.ub., (mm) - the annual layer, taking into account the cleaning (removal of snow to snow melting points or specialized points for storing snow) during the cold period (from November to March).

N.T.ub. \u003d Nt * (1 - Ku), (mm / year),

Ku - snow removal coefficient is applied to subscribers whose subject of activity is the cleaning of urban areas of the road network with the removal of snow to snow melting points or specialized points for snow storage (Ku \u003d 0.5),

Ku - snow removal coefficient is applied to subscribers who export snow to snow melting points or specialized points for snow storage (Ku = 0.8).

If the sum (H + H) is greater than Nos or (Ref. + H isp) is greater than H oc, the volumes of infiltration and drainage flows for the specified period are not calculated.

18. The calculation of the volume of drainage flows (if there is data on the connection of drainage networks to centralized water disposal systems) is made according to the formula:

where:

T is the number of days,

Q, (m/day) - average drainage flow rate,

N etc. - the annual layer of the discharged drainage flow, calculated by the formula:

N others \u003d 0.1 * W d / F, (mm / year).

Drainage flow rate can be determined:

1) by calculation (by filling the container and stopwatch);

2) using a spillway equipped with a level gauge;

3) by measuring the speed and depth of the flow;

4) by measuring the depth of the water flow on drops;

5) using devices for pumping drainage runoff with pumps.

The volume of drainage runoff diverted to centralized sewerage systems is calculated for the corresponding type of drainage network, based on the average annual data on groundwater levels and filtration coefficients established according to technical (including design) and/or as-built documentation.

In the absence of design and / or executive documentation, the volume of drainage flow (organized), diverted to centralized sewerage systems, is calculated according to engineering and geological maps of the city (other settlement).

19. The calculation of the volumes of watering wastewater is carried out according to the formula:

W m = 10 * m * k * m * F m, where:

W m, (m / year) - the volume of irrigation water entering the centralized water disposal systems;

m, (l/m) - specific water consumption for washing road surfaces, taken equal to 1.5 l/sq.m per wash;

k - the average number of car washes per year, for the middle zone of the Russian Federation is assumed to be 150. The data are taken according to the certificates of specialized enterprises containing the road network, as well as based on the data of the concluded state and municipal contracts for the performance of relevant works or the provision of services;

m = 0.5 - runoff coefficient for irrigation water;

F m, (m) - area of ​​coatings subjected to washing/watering.

The calculation of watering runoff is carried out during the warm period (from April to October).

20. If subscribers have technical (including design) and executive documentation for the drainage network, the type of drainage and the estimated average annual volume of drainage flow are established, which is determined by calculating for the corresponding type of drainage based on the average annual groundwater levels and filtration coefficients established according to the design or as-built documentation in accordance with the options given in these Guidelines.

In the absence of design and / or executive documentation, the volume of drainage flow (organized) discharged to centralized sewerage systems is calculated according to engineering and geological maps of the city (other settlement).

In the absence of data on the volume of drainage runoff, the calculation of the volume of surface runoff discharged into centralized wastewater systems in the form of groundwater (infiltration, drainage) is made from the total area.

If data on the volumes of drainage runoff are available, the calculation of the volumes of surface runoff diverted to centralized sewerage systems from infiltration flow should be made from the total area of ​​the territories, with the exception of territories not covered by the drainage system.

Electronic text of the document
prepared by CJSC "Kodeks" and checked against:
Official Internet portal
legal information
www.pravo.gov.ru, February 27, 2015,
N 0001201502270001

Storm (rainfall) runoff calculation is performed to determine the flow rate per second and hydraulic calculation of storm sewers based on the areas and characteristics of the catchment areas.

Specialists of LLC "Region" have significant experience in the calculation and design of both rainwater treatment facilities.

Calculation example

Rainwater discharges qr, l/s, should be determined according to the method of limiting intensities (SP 32.13330.2012 Updated version of SNiP 2.04.03-85) according to the formula:

qr= (z mid *A 1.2 *F) / t r (1.2*n-0.1) = 376.6 l/s

where zmid is the average value of the coefficient characterizing the surface of the drainage basin, determined in accordance with clause 7.3.1, zmid=0.291;

A, n - parameters determined in accordance with clause 7.4.2

A \u003d q 20 * 20 n * (1 + lgР / (lgm r) y \u003d 207.7

where q20 = 70 - rain intensity, l / s per 1 ha, for a given area with a duration of 20 minutes at P = 1 year, determined from Fig. B.1

n = 0.48 - exponent, determined by the table. 9

mr = 120 - the average amount of rain per year, taken from the table. 9;

P = 0.33 - the period of a single excess of the calculated rain intensity, taken according to Table 10;

γ = 1.33 - exponent, taken according to the table. 9.

F = 6.91 - estimated runoff area, ha;

tr is the estimated duration of rain, equal to the duration of surface water flow over the surface and pipes to the design section, min, and determined in accordance with clause 7.4.5.

The estimated flow of rainwater for the hydraulic calculation of rain networks qcal, l/s, should be determined by the formula (14)

tr = tcon + tcan + tp = 11.7 min

tcon - the duration of the flow of rainwater to the street tray or in the presence of storm water inlets within a quarter to the street collector (surface concentration time), 5 min, determined in accordance with clause 7.4.6

The time of surface concentration of rain runoff should be determined by calculation or taken in settlements in the absence of intra-quarter closed rain networks equal to 5-10 minutes or, if they are available, equal to 3-5 minutes.

tcan - the same, along street trays to the storm water inlet (if they are not available within the quarter), determined by the formula (15)

where lcan = 0 - length of sections of trays, m;

tp - the same, for pipes up to the calculated section, determined by the formula (16)

The duration of rainwater flow through the pipes up to the calculated section tp, min, should be determined by the formula:

where Lp is the length of the design sections of the collector, 400 m;

Vp - estimated flow velocity in the section, 1.0 m/s

The average value of the runoff coefficient zmid should be determined as a weighted average value depending on the coefficients z characterizing the surface and taken from Table. 14 and 15.

Estimated rainwater flow for hydraulic calculation of rain networks qcal, l/s, should be determined by formula 12:

Qcal=β*qr = 286.2 l/s

where β is the coefficient that takes into account the filling of the free capacity of the network at the time of the onset of the pressure regime and is determined from Table 8, β=0.76

We select the estimated diameter of the pipe in front of the tank and treatment facilities.

The outlet diameter of polyethylene pipes is taken on the basis of the flow rate Qcal \u003d 286.2 l / s according to the tables of A.Ya. Dobromyslov "Tables for hydraulic calculations of pipelines made of polymeric materials" Volume 2 "Free-flow pipelines" Moscow publishing house VNIIMP 2004

Quantitative characteristics of surface runoff from the territory.

Annual volume of surface runoff.

The calculation of the annual volume of rain, snowmelt and drainage runoff was made taking into account the Federal State Unitary Enterprise "NII VODGEO" "Recommendations for the calculation of systems for collecting and diverting and treating surface runoff from residential areas, enterprise sites and determining the conditions for release" (1), SP 131.13330.2012 Updated version SNiP 23-01-99* "Construction climatology" (2), as well as SP 32.13330.2012 Updated edition of SNiP 2.04.03-85 "Sewerage. External networks and structures” (3).

The average annual volume of surface wastewater generated at the site during the period of rainfall, snowmelt is determined by the formula:

Wg = Wd + Wt + Wm

The average annual volume of rain (Wd) and melt (Wt) water is determined by the formulas:

Wd \u003d 10hd ψd F \u003d 18677.5 m 3 / year;

Wt \u003d 10htψtF \u003d 9770.7 m 3 / year;

Ψ - average runoff coefficient, p.5.1.3-5.1.5 (1), p.7.2.1-7.2.6 (3);

where F = 6.91 ha - total runoff area

hd - precipitation layer, mm, for the warm period of the year, determined according to Table 4.1 (2), 423 mm;

ht - layer of precipitation, mm, for the cold period of the year, tab. 3.1 (2), 202 mm;

ψd = 0.639 - average runoff coefficient, clause 7.2.3 of Table 7 (3);

ψt = 0.7 - average runoff coefficient, item 7.2.5 (3);

The average runoff coefficient ψ d should be determined as a weighted average value depending on the coefficients ψ d characterizing the surface and taken from Table. 7(3).

Table #3

The total annual volume of irrigation water (Wm), m3, flowing from the runoff area is determined by the formula:

Wm \u003d 10 m k FmΨm \u003d 1395.0 m 3 / year

where m is the specific water consumption for washing road surfaces (as a rule, 1.2-1.5 l/m2 per wash is taken);

k - the average number of washes per year (for central Russia is about 150);

Fm - area of ​​hard surfaces subjected to washing, 1.55 ha;

Ψm - runoff coefficient for irrigation water (taken equal to 0.5);

The average annual volume of surface runoff will be:

Wg \u003d 29843.2 m 3 / year

Having the average annual volume of surface runoff, we translate it into the average daily volume.

Average daily volume of annual runoff - 81.8 m3/day

The maximum daily volume of rain runoff from estimated rain Wp, m3, discharged to treatment facilities from residential areas and enterprise sites, is determined by the formula:

Woch \u003d 10 * ha * F * Ψmid \u003d 574.0 m 3 / day

where ha is the maximum layer of precipitation for rain, mm, the runoff from which is treated in full, 13.0 mm;

Ψmid - average runoff coefficient for design rain (defined as a weighted average value depending on the constant values ​​of the runoff coefficient Ψi, for different types of surfaces according to Table 7, paragraph 7.2.3 (3)), 0.639;

F - total runoff area, 6.91 ha

Maximum hourly volume of rain runoff Wpt.h = 574.0/6 = 95.7 m 3 /h

Melt water calculation

The maximum daily volume of melt water Wt.day, m3, in the middle of the snowmelt period, discharged to treatment facilities from residential areas and industrial enterprises, is determined by the formula:

Wt.day \u003d 10 ΨtKu F hc \u003d 69.1 m 3 / day

where Ψt is the total coefficient of melt water runoff (assumed 0.5-0.7);

F - runoff area, 6.91 ha;

Ku - coefficient taking into account partial removal and removal of snow, is determined by the formula:

Ku \u003d 1 - Fu / F \u003d 0.10

Fu - area cleared of snow (including the area of ​​roofs equipped with internal drains) 6.21 ha;

hc - layer of melt water for 10 daytime hours, mm, is taken depending on the location of the object. The boundaries of climatic regions are determined according to the snow runoff zoning map given in clause 5.2.6 (1) and Appendix 1 (1), as well as Fig. B.1 (3), 20 mm;

Useful information and interesting articles:

Photos of water disposal and sewerage:

To date, LLC "Region" has more than 150 successfully completed survey and design works. Our customers are the largest organizations in Russia.Numerous official reviews of organizations confirm our professionalism and responsibility in working with customers.

As part of the design contract, we always prescribe warranty obligations
and liability for missed deadlines.

Specialists of OOO "Region" are ready to assist at all stages of decision-making, both at the stage of considering the concept of the project, and when considering options for the reconstruction of existing buildings and structures. At the design preparation stage, prepare technical specifications for the design and the necessary surveys.
And also prepare estimates for design and surveys according to the collections of basic prices (justification of the price for the tender).

HOW WE DESIGN
Customer idea Preparation of pre-design solutions and variable design Development of a feasibility study (feasibility study) Protection of the main decisions in front of the customer, selection of the best option Preparation of detailed terms of reference for: project development, engineering surveys, inspection Development of working documentation Approvals Author's supervision Realized customer's vision

LICENSES AND CERTIFICATES LLC "REGION"
Region LLC is a member of the voluntary quality certification in accordance with GOST R ISO 9001-2015. Registration number SMK.RTS.RU.03121.17

WE WORK WITH LICENSED SOFTWARE
We design on nanoCAD, a Russian universal CAD platform that contains all the necessary tools for basic design and drawing production.		Our PCs are equipped with Windows 10, the operating system for personal computers developed by Microsoft as part of the Windows NT family. After Windows 8, the system received the number 10, bypassing 9.		We work on Microsoft Office 2010 - a software package focused on the requirements of modern business and the needs of its employees.
The use of licensed software guarantees information security, the legality of the work and reduces the risk of closing the company due to inspections by regulatory authorities.

Q rev.

Rice. Fig. 1. Scheme 1 of regulation of rain runoff in front of treatment facilities and a schematic design hydrograph of rain runoff. 1 - gravity sewer collector

2 – accumulating (regulating) reservoir

3 - a pipeline for draining wastewater to deep treatment facilities

4 – deep cleaning facilities

5 - a pipeline for the discharge of treated waste into a water body or an industrial water supply system

6 - chamber for separating the flow by volume

7 - discharge of excess surface runoff into a water body

Maximum flow rate of rainwater Q ref. discharged into a water body without treatment

line, is calculated by the formulas (1), (2), (3) of Appendix 7 of the recommendations:

Qrel.rev = Qr [(Treg.rev / tr)1-n - (Treg.rev / tr - 1)1-n], l / s,

The moment of time T reg.vol , at which the excess volume of rainwater begins to overflow from the separation chamber 6, is determined by the selection of the value T reg.vol , at which the volume of rainwater entering the storage tank is equal to the volume of wastewater treated from the calculated rain W pt :

0.06 Qr tr [(Treg.rev /tr)2-n - (Treg.rev /tr -1)2-n]/(2 - n) = Woch =

0.06 342.3 10 [(Treg.rev /10)2-0.71 - (Treg.rev /10 -1)2-0.71] / (2 - 0.71) = 203.1 m3

Storm sewage is one of the most important systems for equipping a residential area, which, unfortunately, many owners simply forget about or treat it too lightly. And it is completely in vain - the hopes that rain or melt water will go away by itself often lead to the gradual swamping of the territory, to the destruction or failure of the laid paths and platforms, to the erosion and erosion of the structures of the foundations of the erected buildings, waterlogging of their walls and other negative consequences.

Storm sewage includes many different elements that are responsible for a specific area of ​​water collection, for several such areas or for the entire system as a whole - these are storm water inlets, pipes, wells, collectors. In order for them to be able to cope with their task, their parameters must correspond to the expected volumes of water. And when planning a system, the calculator for calculating the volume of stormwater, offered to the reader's attention, may be useful.

Below, under the calculator, a brief explanation of how it works will be given.