00713565

Component

http://onlinepubs.trb.org...trr/1995/1483/1483-013.pdf

http://www.wsdot.wa.gov/r...orts/fullreports/358.1.pdf

The Washington State Department of Transportation designs, operates, and maintains stormwater detention basins for flood control. Historically, detention basin design was based primarily on hydraulic characteristics such as storage capacity. Initiatives by the Washington State Department of Ecology have prioritized the consideration of stormwater quality as well as quantity for stormwater treatment. Consequently, current operation and future design should consider water quality in addition to flood control. A scale model of a typical basin was constructed to investigate contaminant removal capabilities of existing detention basins. Particular attention was given to the enhanced removal of smaller sediment size fractions and heavy metal contaminants adsorbed to those fractions. Using typical contaminants and concentrations, a simulated highway stormwater runoff was formulated and applied in scale model detention basin testing over a range of flow rates. Four coagulants were evaluated for their ability to enhance removal of sediment and metals. Each coagulant was initially evaluated in laboratory scale batch experiments with continued model tests on selected coagulants. In the model detention basin, coagulant addition resulted in significant increases in metal removal over the range of stormwater flow rates studied. The greatest improvement was observed at the higher flow rates. Enhanced metals removal resulted from increased removal of small particles and their adsorbed metals. Further improvement in contaminant removal was observed following the addition of an influent baffle. This baffle resulted in an increase in hydraulic detention time by reducing short circuiting with an associated improvement in contaminant removal.

This paper appears in Transportation Research Record No. 1483, 1993 Midwest Floods and Water Quality Best Management Practices. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01399791

English

p. 105-111

1995

Transportation Research Record

Figures (6) ; References (15) ; Tables (2)

Catch basins; Coagulation; Contaminants; Design; Detention basins; Drainage; Flood protection; Flow; Heavy metals; Measures of effectiveness; Runoff; Scale models; Sediments; Water quality

Baffles; Effectiveness; Flow rate; Model tests; Removal

Bridges and other structures; Design; Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw

TRIS, TRB

Nov 16 1995 12:00AM

• CORRELATIONS BETWEEN HEAVY METALS AND SUSPENDED SOLIDS IN HIGHWAY RUNOFF: IMPLICATIONS FOR CONTROL STRATEGIES
• CURRENT WATER QUALITY BEST MANAGEMENT PRACTICES DESIGN GUIDANCE
• EFFECTS OF FEDERAL LEVEES AND RESERVOIRS ON 1993 FLOOD STAGES IN ST. LOUIS
• EFFECTS OF STORM WATER REGULATIONS ON COLORADO DEPARTMENT OF TRANSPORTATION
• HYDRAULICS OF FLARED END SECTIONS FOR PIPE CULVERTS
• IMPACTS OF 1993 UPPER MISSISSIPPI RIVER BASIN FLOODS ON HIGHWAY SYSTEMS
• JULY 1993 FLOOD DAMAGE TO US-71 BRIDGE OVER BRUSHY CREEK, CARROLL COUNTY, IOWA: CASE STUDY
• MAGNITUDE AND FREQUENCY OF 1993 FLOOD VOLUMES IN UPPER MISSISSIPPI RIVER BASIN
• MAGNITUDE AND FREQUENCY OF PEAK DISCHARGES FOR MISSISSIPPI RIVER BASIN FLOOD OF 1993
• MOBILIZATION OF MAJOR AND TRACE CONSTITUENTS OF HIGHWAY RUNOFF IN GROUNDWATER POTENTIALLY CAUSED BY DEICING CHEMICAL MIGRATION
• NATIONAL EVALUATION OF WATER QUALITY ISSUES FOR HIGHWAY PLANNING
• SCOUR MEASUREMENTS AT BRIDGE SITES DURING 1993 UPPER MISSISSIPPI RIVER BASIN FLOOD
• SELECTION OF FLOOD FREQUENCY ANALYSIS PROCEDURE FOR EVALUATING FLOOD-ESTIMATION MODELS
• WATER LEVEL STATISTICS FOR DESIGN OF TRANSPORTATION FACILITIES IN COASTAL LOUISIANA