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|Hydraulic Model Tests of the Inlet Structure of a Sewer Running from the Belgrade Ambulance Service to Venizelos Street|
Client: Belgrade Land Development Public Agency
Team of researchers: Novica Petrovic, B.Sc. C.E., Danica Starinac, B.Sc. C.E.
This project involves the re-direction of the old Mokri Lug sewer wastewater - currently discharged directly into the Sava River - towards the Veliko Selo Wastewater Treatment Plant from which it would be discharged into the Danube.
There is a special control structure with an overflow threshold at the upstream end and a check weir at the downstream end of the new sewer.
During the dry and rainy periods, this structure would direct all the runoff up to 5 m³/s in volume and coming from the Mokri Lug collector, towards the new collector, whereas during more abundant rainfall, the excess water would overflow over the threshold and flow towards the existing outfall.
Hydraulic conditions are highly complex due to the specific nature of the structure, hence a physical hydraulic model was required for accurate analyses and sizing. The main objectives of the model tests were to determine the height of the overflow threshold and the characteristics of the weir which would result in the most favourable conditions for incoming flow rates. Analyses were conducted using a model scale of 1:10 (Froude similitude).
Following the completion of the model tests, a solution including specific corrections to the layout of the preliminary design was put foreward and was later used in the final design.
The check weir at the downstream end was also tested in order to verify the suggested solution. Based on the established correlations between specific physical parameters, weir control procedures for various inflow scenarios can now be defined.