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Calculation of internal sewarage
Sewage system is designed by the method as specified in the SNiP 2.04.01-85.
The seconds expends of water in building:
where 
(annex 3 СНИП). 
Calculation costs of sewer water per seconds at he house on a whole:
where 
- expands of sewer water by device with the largest water removing ability – urina (annex 2, СНИП). Hours and daily expands in sewerage system are equal to expands in water-supply system:
Where 
Diameters and slopes of drainage pipes from sanitary instruments in residential building are accepted without calculation. The diameter of the exhaust pipes from the toilet bowls are accepted as 100 mm, from the rest of the devices - 50 mm. We design the slope of drainage pipes in side of riser (for d = 100 mm and i = 0.02; d=50;i=0.03)
Diameters of sewer risers we determine by the Table 8 Building Norms and Rules 2.04.01-85, depending on the magnitude of calculation expenses of wastewaters and the largest diameter of the pipeline. Sewer risers are accepted the same diameter on all height. Calculation consumptions near base of riser are determined by formula (3.17) at the amount of devices, which are connected to this riser. The calculations of sewer risers we carry in view of Table 3.9.
Table 3.9.
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