Compacted subsoil and topsoil typically began producing runoff within 5 to 8 minutes after rainfall began, areas treated with any of the. Evaluation of best management practices for highway runoff control examines best management practices for highway runoff control. Highway stormwater runoff quality is highly variable in space and time. Hydraulics highway runoff manual additional guidance wsdot. 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. There is no phasein timeline for using this approach. Uncontrolled flows also cause erosion, flooding, muddy waters. Wsdot s coverage under the 1995 phase i municipal general permit for large and mediumsized areas to include small urban areas throughout the state. 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. As it flows, runoff collects and transports litter, soil, pet waste, road salt and sand, pesticides, fertilizer, oil and grease, soaps and detergents, and a host of. 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.
Originating organization engineering and regional operations division, environmental and engineering programs. Highway runoff manual wsdot pdf free online publishing. These courses have been selected for this category to maintain, improve or expand the technical knowledge of. Trbs national cooperative highway research program nchrp report 565. Site managers should ensure compliance with txdots storm water management program for construction. Bmps for preventing pollution of stormwater runoff and for treating contaminated runoff are presented in volumes iv and v, respectively. Runoff from composttreated areas during a 30minute high intensity rain storm was less than 0. Section 35 of the 2019 hrm includes two pathways for wsdot address adjustments and deviations to the minimum requirements. This includes rest areas and parkandride lots, throughout washington state wsdot, 2006. The department of ecology reissued the permit, on april 5, 2019.
An effort was required to implement these results in the departments procedures. Wsdot experiences using compost on roadside applications. Stormwater runoff from highways article pdf available in water air and soil pollution 254. Wsdots overall mission is to improve safety and capacity of the states transportation infrastructure. Characteristics of highway stormwater runoff request pdf. View eric mendels profile on linkedin, the worlds largest professional community. The manual includes design details for all stormwater facility types recommended for an airport environment, even if those bmps are relatively unchanged from the highway runoff manual or. 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. 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.
Trbs national cooperative highway research program nchrp report 802. Rain and snow melt flows off paved and other surfaces. These practices are designed to provide a means of avoiding or mitigating the negative impacts of various pollutants that can be carried by rainfall into the groundwater and receiving waters. Highway runoff manual washington state department of. Read pollutant load reductions for total maximum daily loads. Stormwater infiltration in the highway environment. Ndot initiated its certified stormwater training program in october of 2011 and since then, has provided stormwater training to over 800 employees and consultant staff. 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. The 2019 highway runoff manual training workshop is for wsdot staff, local agencies, and consultants. Headquarters environmental affairs and hydraulics remarks. An effort was required to implement these results in. Poster presented at 20 international conference on ecology and transportation canyons, crossroads, connections meeting. 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.
He has sent her some detailed concerns that she will be sharing with ecology. The highway runoff manual hrm is the primary source of stormwater planning and design requirements for highway related work in the state of washington. Pollutant load reductions for total maximum daily loads. Introduction to the hydraulic report pdf 742 kb lesson 8. Stormwater management manual for western washington volume i minimum technical requirements and site planning volume ii construction stormwater pollution prevention volume iii hydrologic analysis and flow control designbmps volume iv source control bmps volume v runoff treatment bmps prepared by. The site studied was biodetention pond 10p2 constructed by vdot at the rte. Consequently, stormwater runoff can pick up pollutants while flowing into local streams and rivers. Evaluation of best management practices for highway runoff. The washington department of transportations maintenance. Highway runoff manual transportation research board.
This includes training, public education and outreach as well as public participation and coordination with government agencies. The presentation focused on some interesting aspects of obtaining a result on desirability per the noise policy. Heather trim noted for the group that jan hasselman with earthjustice is concerned about the work the group is doing. The traffic manual is a guide for department personnel in traffic operations and design. The manual focuses on design modifications to decrease the attractiveness of stormwater facilities to wildlife rather than active wildlife removal measures.
Hydraulics manual hm conveyance policy and design, hydrology and hydraulic methods, bridge design, stream design, lwm, fish passage, pipe materials highway runoff manual hrm stormwater policy and minimum requirements to meet the clean water act. Chapter 9 characterization of stormwater runoff from highways. The idaho transportation department is making plans to widen interstate 84 from nampa to caldwell. The highway runoff manual hrm is an integral part of the. However, the wsdot program was included in wsdots stormwater permit and its ecologyapproved. Evaluation of best management practices for highway runoff control. Maintenance manual m 5101 page i january 2006 foreword reliable, wellmaintained highway transportation facilities are essential to the well being of the state, its citizens, and its commerce. Implementation of the current version of the hdm shall be applied to ongoing projects in accordance with hdm index 82. 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. Wsdot revised the hrm to maintain equivalency with the department of ecologys stormwater management manuals. Overview of manual development the original highway runoff manual was published in 1995 for primary application in the puget sound basin. The highway runoff manual shall be consistent with ecologys stormwater management manual and shall be adopted by.
Trbs national cooperative highway research program nchrp synthesis 444, pollutant load reductions for total maximum daily loads for highways presents information on the types of structural and nonstructural best management practices currently being used by state departments of transportation, including performance and cost data. The manual was designed to be consistent with ecologys stormwater. It flows from rooftops, over paved streets, sidewalks and parking lots, across bare soil and lawns and into storm drains and streams. Maintenance is essential to the performance of runoff treatment and flow control bmps. Eric mendel associate project manger water resources. It does not establish absolute standards but establishes uniform guidelines and procedures for the use of traffic control devices. Highway runoff is generally cleaner than runoff from buildings, farms, mines, harbors or other nonpoint sources. For example, wsdot 2014 notes that its highway runoff manual recommends a maximum sideslope of 4h. Highway design manual change transmittals are posted by change date and include a summary of the significant changes. 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. Nov 01, 2018 the traffic manual is a guide for department personnel in traffic operations and design. As an obligation of wsdot s npdes municipal stormwater permit, this training is required for anyone who will perform stormwater facility design on a wsdot project.
The washington department of transportations maintenance and operations personnel are essential to the states. Wsdots roadside manual includes guidance on design enhancements, which wsdot defines as the incorporation of manmade elements in the landscape to accomplish goals such as expression of community character, marking a community entrance, providing corridor continuity on a scenic or recreational highway, and as mitigation for visual. The highway runoff manual hrm is an integral part of the wsdot npdes municipal stormwater permit permit. For the latest covid19 health guidance, statistics and resources, visit coronavirus. Pdh courses for land surveyors online land surveying. Hydraulics highway runoff manual additional guidance. Projects going to ad after march 6, 2020 shall comply with.
Fhwa funded local agency projects that are similar in scope to wsdot projects and meet or exceed the requirements of the highway runoff manual for stormwater treatment may also be able to utilize this approach. Costeffective and sustainable road slope stabilization and erosion control. Wsdots coverage under the 1995 phase i municipal general permit for large and mediumsized areas to include small urban areas throughout the state. How to use the highway runoff manual and hydraulics manual pdf 574 kb lesson 7. Guidance manual explores practices for the reduction of stormwater volumes in urban highway environments. The stormwater management program swmp, launched in 2003, is kdots interagency effort to control pollutants in stormwater discharge. Stormwater management manual for western washington. The report outlines a fivestep process for the identification, evaluation, and design of solutions for runoff volume reduction based on sitespecific conditions.
Picks up oil, trash, other pollutants and releases them into local waters. The highway runoff manual hrm is an integral part of the obligations contained in the washington state department of transportations wsdots national pollutant discharge elimination system npdes municipal stormwater permit permit. Txdot controls runoff by utilizing best management practices such as vegetative swales and sedimentation ponds, but these efforts do not completely eliminate the pollutants introduced into water sources by storm water runoff. The following courses have been selected carefully to have a direct or indirect relevance to the field of the licensees practice. Wsdot maintains over 7,000 miles of highway and 35,000 acres of facilities. Stormwater flow control and runoff treatment bmp design, stormwater retrofit. This study reports monitoring results from 17 storm events at three highway sites for six commonly sampled metals. For steeper slopes, specific attention should be given to effective spreading of flow and maintaining sheet flow. Engineer in training eit, certified erosion and sediment control lead cescl, 2019 wsdot highway runoff manual hrm trained.