Mangangka, Isri R.
(2016)
Simplified Hydraulic Conceptual Model for Stormwater Treatment
Bioretention Basin.
In: Sriwijaya International Conference on Engineering, Science & Technology (SICEST 2016), 8-10 November 2016, Bangka Island.
Abstract
A bioretention basin performs as a pollutant removal device using filtration as the main mechanism, supported by
evapotranspiration, absorption and biotransformation. This is in addition to attenuation of runoff peak flow and reduction of runoff
volume through detention and retention [1]. Past studies have reported that pollutant concentration reduction in bioretention basins is
poor for a range of pollutant species particularly for nutrient species ll l[2][3][ ]. However, a substantial reduction in outllow volume can
lead to significant reduction in pollutant loads [5].
A range of studies have been conducted for assessing bioretention basjn performance and hydraulic and pollutant removal processes
t6ll7ll8llglt1 0ll1 1l[12]. However, most of the past field studies have been conducted to evaluate the long term treatment performance
while most of the studies which focused on developing an in-depth understanding of processes have been conducted using laboraloryscale
models [13][14][15]. This has resulted in knowledge gaps relating to field performance and associated pollutant removal
p'ocesses in relalion to bioretention basins.
As a part ol this study, a selected operating bioretention basin was evaluated lor its hydraulic processes. This paper focuses on the
development of bioretention basin hydraulic conceptual model. The model utilises a range of conceptual approaches and empirical
equations. The model replicates the infiltration processes through the filter media and water movement within the system from the inlet
to the outlet. The model was successfully calibrated using on-site recorded inflow and outflow data.
Keywords: Bioretention Basin, bioretention model, hydraulic conceptual model.
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