Final Hydraulic Study of the Rainwater Drainage Network in the "Nea Elvetia" Area, Thessaloniki

The Hydraulic Studies Department of Consortis was assigned the task of preparing the final hydraulic study for the rainwater drainage network concerning the at-grade roundabouts on M. Psellou Street, the grade-separated interchange of the Thessaloniki–Moudania National Highway, the roundabout at the intersection of Al. Papandreou and M. Psellou Streets, and the road segment of M. Psellou between the aforementioned roundabouts. The study area is located near the terminal station of Thessaloniki Metro’s main line, "Nea Elvetia," and is under the supervision of OSETH S.A.

The Problem

The "Nea Elvetia" area in Thessaloniki faces significant challenges with stormwater drainage, increasing the risk of flooding and causing difficulties in the operation of critical transportation infrastructure. A comprehensive approach is needed to ensure proper water management and sustainable functionality of the road network.

The Solution

Consortis’ Ηydraulic Σtudies department, leveraging its expertise, developed a comprehensive hydraulic study that included:

• Updated Road Design Study: Special attention was given to the alignment of each traffic lane, road inclinations, sidewalk widths, and curbing details
• Runoff Calculations: Data from drainage basins were used, considering corresponding return periods
• Existing Networks: The existing stormwater and sewage drainage works and associated underground networks were evaluated using data from authorities such as YPEKA, HNMS, and NOA
• Stream Delimitation Study: The study for the Kifissias Stream in the Nea Elvetia area was considered for future needs
• Special Provisions for M. Psellou Street: Due to the limited roadway width and anticipated heavy bus traffic, custom inlet grates with front faces were designed and installed to protect against damage caused by heavy vehicles

The Benefits

The implementation of this study provides solutions that contribute to:

• Flood Protection: Reducing the risk of flooding and ensuring the smooth flow of stormwater
• Functional Infrastructure Improvement: Enhancing the safety and resilience of the road network
• Long-Term Sustainability: Protecting infrastructure from damage caused by extreme weather events
• Transportation Support: Ensuring uninterrupted operation of transportation infrastructure, especially near the Thessaloniki Metro terminal station