Hydrodinamic modeling for a dry-weather sewer in the 3rd and 4th districts of Maricá

Abstract

Since the late 19th century, Brazil has adopted the separate sewer system as the national sanitation model. However, there has been significant difficulty in its successful implementation and operation, with occurrences of domestic sewage in stormwater drainage systems. To deal with these vulnerabilities, alternative approaches such as the Dry-Weather Flow Interceptor (DWFI) have emerged, functioning as a complementary solution to the existing network, especially in underserved areas or those with operational failures. Thus, the main objective of this study is to evaluate the hydraulic performance of a DWFI under a real rainfall series, assessing the BOD load discharged into a receiving water body before and after its implementation. The proposed DWFI for the 3rd and 4th districts of the municipality of Maricá, in the state of Rio de Janeiro, was adopted as a case study. The proposal aims to enhance the efficiency and resilience of the local sanitation infrastructure, with a focus on improving environmental quality. The methodology was based on the design and hydrodynamic modeling of this network using the MODCEL software. The results demonstrated that the DWFI shows significant potential in reducing the organic load discharged into receiving water bodies, reinforcing its feasibility as a complementary technical solution for urban areas.