Dubai Municipality engaged CDM Smith to upgrade and rehabilitate the stormwater systems in east Deira, a central and diverse area of Dubai covering approximately 6,500 hectares. The project aimed to address frequent flooding caused by increased runoff and limited capacity in the existing stormwater network. Our work included assessing the current infrastructure, conducting site surveys and geotechnical investigations, and using advanced modeling software (SewerGEMS and InfoWorks ICM) to analyze the network’s carrying capacity. We proposed technical solutions such as optimizing pump operations, introducing alternative Sustainable Drainage Systems (SuDS), and adding overflow pipes to control flooding. Notably, upgrading the existing network was considered a last resort due to cost and construction challenges. The consultancy also prepared tender documents, managed pre-tender clarifications and evaluated tenders, ensuring the project’s objectives—reducing flooding and improving access for residents and commuters—were met efficiently and economically.