ABSTRACT
In past decades, stormwater management has become an essential component of climate-change resilient urban development. Replacement of natural pervious areas with impervious surfaces increases stormwater runoff volumes and peak flows. In the absence of sufficient drainage system, cities are subject to urban flooding with potential loss of life and property damage. Underground solutions with network of smart tunnels and pumping stations are of a central role for urban resilience. The present paper studies a stormwater infrastructure in the city of Jeddah in the Kingdom of Saudi Arabia. In the framework of Jeddah Stormwater Drainage Program and Masterplan, a new pump station known as Al-Salam Pump station, is planned to discharge the incoming flow from the storm water tunnel to the Red Sea via an outfall. The design and construction of the deep large-diameter shafts close to the sea as well as their intersection with the connecting tunnels involved several technical challenges. Geotechnical analyses combined with advanced numerical methods were used for an optimized design. As an overall assessment, a Value Engineering study of the proposed solution was carried out highlighting the Value Engineering Concepts, their technical evaluation and engineering development as well as cost, risk and sustainability impact on the project.
