Academia
Diploma thesis 2026Civil Engineeringdimenzioniranje · fekalna kanalizacija · hidravlični izračun

Design and Dimensioning of a Separate Sewerage System for the Šiška Residential Area in the Municipality of Preddvor

The area under consideration is intended for the construction of single-family residential buildings.

Blaž ŽlindraGradbeništvo · module Gradbeništvo · supervisor Bojan Dapčević · defence avgust 2026
In brief

The project in five facts.

AuthorBlaž Žlindra
SupervisorBojan Dapčević
ModuleCivil EngineeringCivil Engineering
Employer / clientAcademia
Year2026avgust 2026
About the project

Challenge, approach and results.

The diploma thesis addresses the planning of a separate sewerage system for a new residential area in the settlement of Šiška in the municipality of Preddvor. The stormwater drainage system is treated with an oil separator before discharge into the Suha watercourse, which contributes to greater environmental protection. Special attention was also given to stormwater drainage.

Solution and Method

The diploma thesis addresses the planning of a separate sewerage system for a new residential area in the settlement of Šiška in the municipality of Preddvor. The area under consideration is intended for the construction of single-family residential buildings. The purpose of the diploma thesis is to design appropriate solutions for separate discharge of foul and stormwater, verify technical feasibility and propose an appropriate environmental solution.

In planning the municipal infrastructure, a separate water drainage system was envisaged, in which the foul and stormwater systems are separate. Such solutions reduce the burden on municipal wastewater treatment plants and the environment. The favourable terrain configuration of the area under consideration enables the construction of a gravity sewerage system without the need for pumping, therefore a reliable gravity discharge with lower operating and maintenance costs is envisaged.

Hydraulic calculations were carried out for dimensioning both sewerage systems. The design flow rate was determined using the rational method; Manning's equation was used for dimensioning pipe diameters, and the diameters were also verified using Sewer+ software.

Results

The stormwater drainage system is treated with an oil separator before discharge into the Suha watercourse, which contributes to greater environmental protection. Special attention was also given to stormwater drainage. Before discharge into the Suha watercourse, installation of an oil separator is envisaged, which enables the removal of oils and other pollutants from rainwater and reduces their impact on the aquatic environment.

Such a solution contributes to the protection of surface waters and is consistent with the principles of sustainable water management and current environmental legislation. Based on the analyses carried out and hydraulic calculations, it was established that the proposed solution enables efficient gravity discharge of foul and stormwater with a separate sewerage system. The dimensioned pipelines ensure appropriate hydraulic conditions for the anticipated loads, whilst the selected design reduces the burden on the treatment plant, improves protection of the aquatic environment and represents an appropriate professional basis for further design and implementation of municipal infrastructure in the area under consideration.

Polaganje kanalizacijskih cevi v gradbeni jarek
Diploma thesis

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