A survey of trace organics in highway runoff in seattle, washington, ward 39. Introduction chapter 1 page 12 highway runoff manual m 3116. Evaluation of best management practices for highway runoff. Highway runoff manual hrm was developed to direct the planning and design of stormwater management facilities for existing and new washington state highways, rest areas.
For example, at a given location the concentration of total suspended solids tss in highway stormwater runoff can vary from 40 to 1200 mgl within one runoff event, and from an event mean concentration of 8 mgll to an event mean concentrations of 810 mgil between events. Alaskan way viaduct demolition is complete curbed seattle. The highway runoff manual hrm is an integral part of the wsdot npdes municipal stormwater permit permit. The wsdot highway runoff manual includes detailed design criteria for three configurations side slope with underdrain, median configuration with under drain, and side slope application without underdrain, and, at the time of this writing, wsdot was in the process of developing guidance for additional configurations that was due to be pub. Minnesota road expansion leads to better storm water control. Highway first flushes resulted in the mortality of all tested individuals within 24 to 48 h. Suggested revisions to wsdot manuals for implementing washington state highway runoff water quality research results. Guidance manual explores practices for the reduction of stormwater volumes in urban highway environments. Highway runoff is generally cleaner than runoff from buildings, farms, mines, harbors or other nonpoint sources. Bmp options sheet for highway and road runoff management. Trbs national cooperative highway research program nchrp report 802. Heather trim noted for the group that jan hasselman with earthjustice is concerned about the work the group is doing.
Highway runoff monitoring studies have evidenced already the types of pollutants present and proved how much pollutant loads and concentrations depend on road characteristics and rainfall pattern harrison et al. Foreword this lid design manual for national cooperative highway research program nchrp project 252001 is one of three reports of the project evaluation of best management practices and low impact development for highway runoff control that present results of this project, which ran between august 2002 and may 2006. Characteristics of highway stormwater runoff request pdf. A first flush collected from highway 4 traffic volume. Detail summaries of sites and events are shown in table 1, which includes site area, date, average daily traffic adt, antecedent dry days, rainfall, storm duration, and total volume of runoff. The washington state department of transportation highway runoff manual, as determined by the washington state department of ecology to be equivalent to the 2014 department of ecology stormwater management manual for western washington, may be used to meet the requirements of chapters 30. Wsdot revised the hrm to maintain equivalency with the department of ecologys stormwater management manuals. Highway runoff and potential for removal of heavy metals. Projects going to ad after march 6, 2020 shall comply with.
Controlling nonpoint source runoff pollution from roads. Wsdot has worked for more than two decades to improve fish passage and reconnect streams to help keep our waterways. Department of transportation federal highway administration and the massachusetts department of transportation, conducted a field study from september 2005 through september 2007 to characterize the quality of highway runoff for a wide range of constituents. Changes to the hrm and npdes permit major changes to the hrm by chapter require low impact development techniques make the manual more of a design manual. To help us meet that goal, please consider the environment before you print or request a copy.
If wsdot proposes to adopt a manual other than ecologys stormwater management manual as its highway runoff manual, wsdot shall formally consult with the tribes and local governments about the contents of the highway runoff manual. For the latest covid19 health guidance, statistics and resources, visit coronavirus. Views of risk and highway transportation of hazardous materials a case study in gasoline, ward 39. An effort was required to implement these results in the departments procedures.
Highway runoff is an important nonpoint source of pollutants, especially metals. This study reports monitoring results from 17 storm events at three highway sites for six commonly sampled metals. Controlling nonpoint source runoff pollution from roads, highways and bridges. This act contains provision for the planning and developing of highway systems and a host of transportation enhancements activities including the mitigation of water pollution due to highway runoff. Highway stormwater runoff quality is highly variable in space and time. Highway runoff manual washington state department of. The washington state department of transportation wsdotuniversity of washington highway runoff water quality research project, conducted from 1977 to 1982, produced a number of results of potential use to wsdot. The concentrations were variable throughout the storm events and some of the components responded similarly and others differently depending on the source and form of the. Wright county highway department in minnesota decided to improve approximately 1 mile of county state aid highway 18 to improve the structural strength of the roadway.
Runoff samples for the part a sites were analyzed for. The roadside manual supplements the roadside policy manual rpm by explaining how to implement the policies found in the rpm. The report outlines a fivestep process for the identification, evaluation, and design of solutions for runoff volume reduction based on site. The highway runoff manual hrm provides guidance to direct the planning and design of stormwater management facilities for existing and new washington state highways, rest areas, parkandride lots, ferry terminals, and highway maintenance facilities throughout the state. Pollution in stormwater runoff in a highway toll gate area.
The department of ecology reissued the permit, on april 5, 2019. Wsdot maintenance staff responsible for developing roadside management plans and roadway maintenance practices. Trbs national cooperative highway research program nchrp report 565. State highways cross streams and rivers in thousands of places in washington state, which can impede fish migration. Chapter 9 characterization of stormwater runoff from. However, the wsdot program was included in wsdots stormwater permit and its ecologyapproved. Washington state highway runoff water quality research. Hrm program manager wsdot po box 47329 olympia, wa 985047329 what happens when compliance with the hrm is not economically feasible, physically possible, or environmentally responsible. Wsdot facilities from bst to acp or pccp without expanding the area of coverage.
The site studied was biodetention pond 10p2 constructed by vdot at the rte. Through istea, states are able to use a portion of their federal funding allotment for runoff pollution control devices and other bmps to prevent. Quality of stormwater runoff discharged from massachusetts. It is ironic, though, that despite the vast number of measures taken and resources invested to minimize its impact on receiving waters, highway stormwater runoff is still one of the most misunderstood and misrepresented contributors. S forest service mount bakersnoqualmie, olympic, giffordpinchot. Hydraulics highway runoff manual additional guidance. Year 3 runoff water quality, august 1979 august 1980, ward 39. Outfalls were chosen to characterize runoff that drains directly from highway pavement.
Purpose, need, and scope the highway runoff manual hrm was developed to direct the planning and design of stormwater management facilities for new and redeveloped washington state highways, rest. Year 4, runoff water quality, august 1980august 1981. Chapters include laws and policies, visual functions, wetlands, wildlife, safety rest areas, soil amendments, contour grading, soil bioengineering. However, this may not be the case if the runoff causes damage by carrying road salt, sand, silt or sediment onto the property. He has sent her some detailed concerns that she will be sharing with ecology. Army corps of engineers, or occur on lands administered by the national park service mount rainier, olympic, north cascades, and u. Chapter 9 characterization of stormwater runoff from highways. The mission of the department of ecology is to protect, preserve, and enhance washington s environment. The alaskan way viaduct is officially gone forever after a monthslong demolition process. Removing the elevated highway has been in the works for a long timebut it can still seem like it came. Subscribe to highway runoff nominate the storm water solutions staff invites industry professionals to nominate the water and wastewater projects they deem most remarkable and innovative for recognition in the annual reference guide issue. This lid design manual for national cooperative highway research program nchrp project 252001 is one of three reports of the project evaluation of best management practices and low impact development for highway runoff control that present results of this project, which ran between august 2002 and may 2006. Highway runoff water may be responsible for serious environmental impacts, especially in the long term. This guidelines manual is intended to provide the highway engineer andor agency responsible for preparation of environmental assessments with the necessary procedures to evaluate potential impacts from.
The research is a part of the federal hjghway admin. The roadside manual links partners working on wsdot roadsides. Section 35 of the 2019 hrm includes two pathways for wsdot address adjustments and deviations to the minimum requirements. Highway runoff manual wsdot pdf free online publishing. Route runoff through a screen or filter material to remove litter and treat particulate, and the associated nutrients, toxics and hydrocarbons gross solids removal device gsrd see image, compost tube inside of rock weep. Characterization of highway runoff in washington state, ward 39.
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