Urban Runoff Modeling Using HEC-HMS for Sustainable Water Management: A Case Study of District 10, Mashhad, Iran
DOI:
https://doi.org/10.63053/ijset.163Keywords:
Urban runoff, HEC-HMS, rainfall-runoff modeling, sustainable water management, green space irrigation, Mashhad.Abstract
Water scarcity in arid and semi-arid regions necessitates innovative approaches for urban water management. This study employs the Hydrologic Engineering Center - Hydrologic Modeling System (HEC-HMS) to simulate rainfall-runoff processes in District 10 of Mashhad, Iran, with the objective of quantifying runoff potential for non-potable urban uses such as green space irrigation. The study area, characterized by mixed land use including residential, commercial, and industrial zones, was delineated into seven sub-basins based on drainage networks and topographic gradients. Rainfall data from the nearest synoptic station with a 25-year return period were used to generate hyetographs and runoff hydrographs. The initial loss and constant rate method were applied for infiltration estimation, while the Muskingum method was used for flow routing. Results indicate a peak outflow of 4.4 m³/s and a total runoff volume of 8.59 mm (equivalent to approximately 79.8 liters per square meter) from a 16.06 mm rainfall event. Sub-basin analysis revealed variable runoff responses, with D10-S5 exhibiting the highest peak discharge (3.1 m³/s) and D10-S3 showing the highest runoff conversion efficiency (64.2%). The findings demonstrate the feasibility of harvesting urban runoff for green space irrigation, potentially reducing potable water demand. This research provides a replicable methodological framework for urban water managers in water-scarce cities.
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