<![CDATA[This study aims to examine the relationship between urban drainage capacity and flood inundation potential on the deterioration of residential environmental quality in Southeast Aceh Regency. This associative quantitative research combines channel hydraulic discharge availability analysis, inundation vulnerability mapping, and the Residential Environmental Quality Index (REQI) evaluation. Primary data were gathered through physical surveys of drainage channel geometry, field observations of inundation depth and duration, and structured questionnaires distributed to 150 household heads across three flood-prone residential areas in Kutacane, Southeast Aceh Regency. Data were analyzed using multiple linear regression techniques and spatial evaluation. Results reveal that the existing drainage capacity can only accommodate 58.4% of peak rainfall runoff, directly triggering inundation potentials ranging from 20 to 60 cm with durations up to 5 hours. Statistical testing proves that drainage capacity and inundation potential, both partially and simultaneously, significantly affect residential environmental quality (R^{2}=0.612,p\lt 0.001). Inundation impacts linearly accelerate local road infrastructure degradation, lower environmental sanitation, and increase environmental-based disease risks. Research recommendations highlight the necessity of eco-hydrological integrated drainage system improvements to enhance the environmental carrying capacity of residential areas in Southeast Aceh Regency.]]>
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