Redox Dynamics and Oxygen Reduction Rates of Inﬁltrating Urban Stormwater beneath Low Impact Development (LID)
AbstractLow impact development (LID) best management practices (BMPs) collect, inﬁltrate, and treat stormwater runoff, and increase recharge to aquifers. Understanding the controls on reduction/oxidation (redox) conditions within LID BMPs is important for groundwater management because outﬂow from some LID BMPs can recharge aquifers and affect groundwater quality. Here we evaluate redox conditions of urban stormwater runoff in a LID inﬁltration trench in San Francisco, California, and quantify the relation between water saturation (%) and temperature (◦C) and resulting dissolved oxygen (DO) concentrations, redox dynamics, and O2 reduction rates. The DO ﬂuctuations ha ve an inverse response to the duration of saturation of the trench. Anoxic (<0.5 mg/L) conditions often occurred within hours of stormwater events and persisted from a few hours to two days, which indicate that microbial respiration can be a limiting factor for DO. Temperature of stormwater runoff was not a statistically signiﬁcant control on DO. The estimated O2 reduction rate is 0.003mg·L-1·min-1, which is two to ﬁve orders of magnitude higher than in groundwater from previous studies. Higher rates of O2 reduction are a function of the more toxic and organic-rich stormwater runoff that drives faster microbial O2 reduction. Our ﬁndings have important implications for the design of inﬁltration trenches and other LID BMPs to achieve desired redox conditions for inﬁltrating stormwater toward minimizing groundwater contamination. View Full-Text
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Danfoura, M.N.; Gurdak, J.J. Redox Dynamics and Oxygen Reduction Rates of Inﬁltrating Urban Stormwater beneath Low Impact Development (LID). Water 2016, 8, 435.
Danfoura MN, Gurdak JJ. Redox Dynamics and Oxygen Reduction Rates of Inﬁltrating Urban Stormwater beneath Low Impact Development (LID). Water. 2016; 8(10):435.Chicago/Turabian Style
Danfoura, Mays N.; Gurdak, Jason J. 2016. "Redox Dynamics and Oxygen Reduction Rates of Inﬁltrating Urban Stormwater beneath Low Impact Development (LID)." Water 8, no. 10: 435.
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