This project was developed to provide a stormwater drainage solution for two development plots in the Malinova Dolina East area of Sofia.

Rather than simply following the previously approved conceptual design, a detailed engineering review was carried out to assess its technical feasibility. The analysis identified that part of the proposed storm sewer alignment could not be constructed because the planned street regulation had not been implemented and the required land acquisition procedures had not been completed.

An alternative engineering solution was therefore developed based on the existing infrastructure and the current site conditions. The revised design redirected the drainage system to a newly proposed sewer branch connected to an under-construction public sewer, while incorporating stormwater detention tanks to regulate runoff before discharge into the municipal network.

To verify the proposed solution, the entire drainage system was hydraulically reassessed using updated catchment areas, current development plans, and the attenuation effect of the detention tanks. The analysis confirmed that the revised design would not overload the existing sewer network while ensuring reliable collection and discharge of both stormwater and wastewater.

The project demonstrates how engineering analysis and hydraulic modelling can transform an impractical concept into a technically feasible and cost-effective infrastructure solution.