Field Evaluation of Hydrologic and Water Quality Benefits of Grass Swales for Managing Highway Runoff

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dc.contributor.advisorDavis, Allen Pen_US
dc.contributor.authorStagge, James Howarden_US
dc.contributor.departmentCivil Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2006-11-01T06:31:14Z
dc.date.available2006-11-01T06:31:14Z
dc.date.issued2006-09-22en_US
dc.description.abstractDue to growing awareness of non-point source pollution treatment, the performance of grass swales as a highway runoff treatment and the effect of including a grass filter strip pretreatment area adjacent to the swale were evaluated using a field-scale input/output study on a Maryland highway. Results of this comparison for 22 rainfall events over 1.5 years show significant peak reduction (50-53%), delay of the peak flow (33-34 min) and reduction of total volume (46-54%). The grass swales exhibited statistically significant removals by mean concentration of total suspended solids (41-52%), nitrite (56-66%) and zinc (30-40%), lead (3-11%), copper (6-28%) and cadmium. Other monitored nutrients (nitrate, TKN, and total phosphorus) exhibited variable removal capabilities (-1-60%), while the swales exported chloride (216-499 mg/l) at a significant level. Results suggest the pretreatment grass filter strip imparts no significant water quantity or quality improvement and that the swale itself is the most important treatment mechanism.en_US
dc.format.extent1536114 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/3969
dc.language.isoen_US
dc.subject.pqcontrolledEngineering, Environmentalen_US
dc.subject.pqcontrolledEngineering, Civilen_US
dc.subject.pqcontrolledEngineering, Environmentalen_US
dc.subject.pquncontrolledgrass swaleen_US
dc.subject.pquncontrolledBest management practiceen_US
dc.subject.pquncontrolledhighway runoffen_US
dc.subject.pquncontrolledpretreatmenten_US
dc.subject.pquncontrollednutrienten_US
dc.subject.pquncontrolledtotal suspended solidsen_US
dc.titleField Evaluation of Hydrologic and Water Quality Benefits of Grass Swales for Managing Highway Runoffen_US
dc.typeThesisen_US

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