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However, the functionality of these systems often needs to improve due to irregular interconnections, resulting in a mixed and malfunctioning system. Sewage collection is crucial for residential sanitation, but untreated collection significantly contributes to environmental degradation. Analyzing the simultaneous operation of both systems becomes vital for effective management. Using mathematical tools for precise and unified diagnosis and prognosis becomes imperative. However, municipal professionals and companies need more tools specifically designed to evaluate these systems in a unified way, mapping all the hydraulic connections observed in practice. This study proposes a unified simulation method for stormwater and sanitary sewer urban systems, addressing real-world scenarios and potential interferences. The primary goal is to develop a simulation method for both systems, considering system interconnections and urban layouts, involving hydrodynamic and water quality simulations. The practical application of this method, the Multilayer Hydrodynamic Simulation Method (MODCEL-MHUS), successfully identifies issues in urban water networks and suggests solutions, making it a valuable tool for urban water management and environmental engineering professionals.<\/jats:p>","DOI":"10.2166\/wst.2024.221","type":"journal-article","created":{"date-parts":[[2024,7,3]],"date-time":"2024-07-03T07:03:20Z","timestamp":1719990200000},"page":"190-212","update-policy":"https:\/\/doi.org\/10.2166\/iwapcrossmarkpolicypage","source":"Crossref","is-referenced-by-count":3,"title":["MODCEL-MHUS: a comprehensive multilayer hydrodynamic unified simulation for stormwater, sanitary sewer systems, and urban surface"],"prefix":"10.2166","volume":"90","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7334-1928","authenticated-orcid":false,"given":"Antonio Krishnamurti Bele\u00f1o","family":"de Oliveira","sequence":"first","affiliation":[{"name":"a Departamento de Engenharia Civil e Ambiental, Pontif\u00edcia Universidade Cat\u00f3lica do Rio de Janeiro, R. Marqu\u00eas de S\u00e3o Vicente, 225, G\u00e1vea, Rio de Janeiro ZIP Code: 22453-900 RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paulo Canedo de","family":"Magalh\u00e3es","sequence":"additional","affiliation":[{"name":"b Escola Polit\u00e9cnica, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos, 149, Cidade Universit\u00e1ria, Rio de Janeiro, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Osvaldo Moura","family":"Rezende","sequence":"additional","affiliation":[{"name":"b Escola Polit\u00e9cnica, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos, 149, Cidade Universit\u00e1ria, Rio de Janeiro, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matheus Martins de","family":"Sousa","sequence":"additional","affiliation":[{"name":"b Escola Polit\u00e9cnica, Universidade Federal do Rio de Janeiro, Av. 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