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Technology and Engineering
- ISSN: 2333-2581
- Modern Environmental Science and Engineering
SuDS Sizing Approaches for Non-Point Source Contaminant Control in Humid Sub-Tropical Rainfalls
Carme Machí Castañer, and Paulo Renato de Mesquita Pellegrino
Universidade de São Paulo, Brazil
Abstract: São Paulo Metropolitan Region (SPMR) urban growth turned hundreds of streams into covered channels in the upper Tietê River basin. Engineering practices of channeling and covering water bodies are still common in the RMSP. This research is integrated to the Jaguaré’s Watershed Restoration Pilot Program initiative in São Paulo. This work investigates the efficiency of Green Infrastructure Technologies (GIT), vegetated systems that recover natural functions in impaired watersheds, for reducing stormwater diffuse contamination. Sustainable Urban Drainage systems (SUDs) were projected as a source control of runoff during the rainstorms. The main question assessed in this paper was whether US unified approach criteria, generally used as BMPs planning guideline in temperate regions, were able to meet SPMR water quality targets given its different rainfall distribution, rainfall-intensity patterns and storm antecedent dry periods (ADPs), which affected to runoff Event Mean Concentrations (EMCs). This question was assessed through estimating bio-retention removal efficiencies in rainstorms in SPMR after substantially different precedent dry periods (ADP). Water Quality Volume (WQV) was established according to 90% sediment reduction, and the ability of the system to retain the First-flush volume was simulated using the EPA-XPSWMM software.
Key words: São Paulo, watershed restoration, green infrastructure, diffuse contamination, sustainable urban drainage, water quality volume