Environmental Engineering Reference
In-Depth Information
Before construction
Iron-Osorb fill media
Year 1
Iron-Osorb®
Sandy fill media
During construction
After construction
Influent
Vegetation
Underdrain
Ponding area
Mulch layer
Euent
Soil medium
Storm sewer
Gravel filter
Drain
Control
Osorb mix
FIGURE 33.8
Site, plan, and cross-section views of ield-scale bioretention systems (rain gardens) installed at the campus of
the College of Wooster, Ohio. One standard model and one version enhanced with Fe-Osorb.
the standard bioretention system (Figure 33.9); (ii) a signiicantly lower concentration of
leaching nutrients was also observed in the Fe-Osorb-enhanced bioretention system com-
pared with the standard system (Figure 33.9); (iii) both bioretention systems signiicantly
reduced runoff volume (~95%) and peak low (~97%) during natural runoff events; and
(iv) Fe-Osorb amendment did not alter the hydrodynamics of runoff in the ill media
while maintaining a high iniltration rate. Further ield tests will be continued to evaluate
both hydraulic and treatment performance of the standard and Fe-Osorb-enhanced biore-
tention systems with a wide range of other runoff pollutants.
