Relating Wetland Functions to Stormwater Nitrogen Load Removal in Bioretention Areas. Non-point Pollution Control:. Sharkey 2001. NC STATE UNIVERSITY. The Problem. Increased Runoff. Short Circuit Groundwater. Nutrient Addition From Stormwater. NH3-N .22mg/L NO3-N .25mg/L*
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Non-point Pollution Control:
Short Circuit Groundwater
From J.S. Wu (1996),
Concentrations in Runoff
Research By Hunt (2003)
Particulate Organic Nitrogen ( Removal in Bioretention AreasPON)
Soluble Organic Nitrogen (SON)
Vegetative NAddition to Surface Water
Aerobic zone throughout. Water freely drains from entire soil profile.
Concrete Drop Box with Standard Inlet
Top layer: Mulch
8 – 16 mm
Sandy loam –
Loamy Sand fill soil
1 – 1.2 m
5 – 10 mm
Outlet pipe (RCP or CMP typ) for overflow and drainage.
Washed Gravel Envelope
Corrugated Plastic Underdrain (typically 4” diameter)
Cross Sections of Bioretention Area
From Hunt 2003
Aerobic Zone: Nitrification (NH4 to NO3)
Denitrification (NO3 to N2)
From Hunt 2003
Site Excavation drain pipe.
Elbow used to induce anoxic conditions
Photos: Bill Lord, 2001
Lab Studies of Induced Anaerobic Layer Conclude Higher Reductions
Complications in relating these to Field studies.
Martin, Jay F, Reddy, K R. 1997. Interaction and Spatial Distribution of Wetland Nitrogen Processes. Ecological Modeling. 105: 1-21.
Hunt, WF. 2003. Pollutant Removal Evaluation and Hydraulic Characterization for Bioretention Stormwater Treatment Devices. Unpublished Thesis Document.
Wu, Jy S., Allen, C. J. 1998. Characterization and Pollutant Loading for Highway Runoff. J. of Environmental Engineering. July, 1998: 584-592.
QUESTIONS? drain pipe.