Abstract
The paper presents verification of selected flow time methods in terms of usability for sewage systems design and sizing on the example of a model municipal flat drainage area of the area of 2 km2. Namely, the sewage system network was sized using three methods, that is, MGN with Błaszczyk’s formula, MGN with the precipitation model for WROCLAW and MWO with the precipitation model for Wroclaw, and then, the network functioning was verified for damming up on the area surface and flooding from drains using the hydrodynamic model SWMM 5.0. The precipitation model of Euler type II was used as the drainage area load in the conditions of Wroclaw, for which the probabilistic model of the maximum precipitation was developed. It was shown that the safe flow time method for sewage system sizing is MWO using the criterion for the lack of damming up for the area and flooding from drains.