Mr. Amir Reza Ahmadi Motlagh is a distinguished professional, actively engaged in project management and the design of infrastructure for sanitary and storm sewer systems at Mahab Ghodss Consulting Engineers Company. His area of interest is in the field of underground infrastructure systems, including hydraulic modeling, design, and optimization of sewer systems. He was in charge of project management for the design of sanitary and storm sewer systems in major Iranian cities, including Tehran, Isfahan, Bandar Abbas, and Hamedan. He is actively involved with the Iranian Ministry of Energy in developing several manuals, practices, and specifications. He is the principal author of "Design Criteria for Sanitary and Storm Sewer Systems", prepared for the Ministry of Energy in Iran. These criteria are regarded as the main design standard for sewer systems in Iran. He has published more than 20 papers and manuals on various aspects of the design and maintenance of sewer systems. He has been an active lecturer in the Civil Engineering Department of Iran University of Science and Technology (IUST) for more than 12 years, holding courses related to the design and maintenance of water and wastewater systems, and has made presentations at major conferences. He currently serves as the International Marketing Manager and adviser to the Managing Director at Mahab Ghodss Consulting Engineers Company. He is a member of the International Water Association (IWA) and the German Association for Water, Wastewater, and Waste (DWA), and a key committee member of the Sewage Division at the Iran Ministry of Energy.