Evaluating the performance of on-site stormwater detention based on the technical guidelines for developing stormwater projects in Belo Horizonte (MG, Brazil)

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Abstract
Standardized design criteria and performance assessment of parcel-level on-site stormwater detention (OSD) remain limited. This study evaluates the hydrological impact of OSD — designed per Belo Horizonte’s (Minas Gerais, Brazil) municipal guidelines — at both parcel and catchment scales using hydrological modeling in a highly impervious, flood-prone subcatchment. Results indicate that while existing guidelines are generally effective, volume sizing could be optimized. OSD implemented across 31.8% of the catchment significantly reduced peak flows, though effectiveness varied by spatial scale. At the parcel level, outflows decreased by 72.3% for 2-year and 50.7% for 100-year return period rainfalls, with delay in peak times of 41.7%. At the catchment level, peak flow reductions reached 24.6% (2-year) and 26.4% (100-year). Flow routing at the catchment outlet revealed reductions in channel overflow volumes and maximum water heights by 75.5%, 54%, and 49% for 2-, 10-, and 50-year events, respectively.
Funding Information
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (18/2021)
  • Fundação de Amparo à Pesquisa do Estado de Minas Gerais (18/2021)
  • UFMG (18/2021)
  • CAPES (18/2021)

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