Stormwater management manual for western washington february 2005 publication numbers 0510029 through 0510033 replaces publication numbers. Nonpoint sources, on the other hand, include agricultural runoff, mine drainage, urban and highway runoff, and runoff from lawns and natural areas. Stormwater management manual for western washington. Outfalls were chosen to characterize runoff that drains directly from highway pavement. Assessing impacts of state highway stormwater runoff on.
Wsdot is studying how compostamended vegetated filter strips can reduce and improve stormwater runoff. Your lawn will look better with less water and fertilizer. Trbs national cooperative highway research program nchrp report 802. The committee approved legislation authorizing approximately wright county highway department in minnesota decided to improve approximately 1 mile of county state aid highway 18 to improve the structural. Bmp options sheet for highway and road runoff management. An implementing agreement with the washington state department of ecology ecology commits wsdot to. Seldm data current conditions past 7 days 420425122361700 highway runoff site near i5 and old hwy 99. Denser roots will absorb more water, reducing lawn runoff and preventing erosion. Nominally, seldm is a highway runoff model, but it is well suited for analysis of runoff from other land uses as well. Stormwater retrofits for treating highway runoff carly greyell king county water and land resources division. However, the wsdot program was included in wsdots stormwater permit and its ecologyapproved. For example, stormwater runoff from lawns and driveways travels down. May 01, 2012 5 ways to stop runoff from ruining your lawn if youre frustrating with runoff damaging your garden and destroying your lawn, follow these possible solutions to get it under control.
Highway stormwater runoff quality is highly variable in space and time. The site studied was biodetention pond 10p2 constructed by vdot at the rte. Stormwater 101 guide stormwater overview stormwater background stormwater is now the primary cause of water pollution in the united states, resulting in numerous federal, state and local regulations. This method was introduced in 1889 and is still being used in most engineering offices in the united states. Modeling of highway stormwater runoff sciencedirect. The precipitation stations represent rainfall at elevations below 1500 feet. Section 35 of the 2019 hrm includes two pathways for wsdot address adjustments and deviations to the minimum requirements. Chapter 9 characterization of stormwater runoff from highways. Wsdot revised the hrm to maintain equivalency with the department of ecologys stormwater management manuals. The research is a part of the federal hjghway admin. Maintenance is essential to the performance of runoff treatment and flow control bmps.
Managing pollution from highway storm water runoff bruno maestri, michaele. Bmps for preventing pollution of stormwater runoff and for treating contaminated runoff are presented in volumes iv and v, respectively. The highway runoff manual hrm provides guidance to direct the planning and design of stormwater management facilities for existing and. Clark county stormwater manual 20152021 book 2 bmp. Quite simply, stormwater is runoff that flows into. In general, runoff from development sites within a drainage basin should be discharged at the existing natural drainage outlet or outlets. Public storm water program texas department of transportation. Public roads and highways stormwater work group for puget sound. Wsdot maintenance staff responsible for developing roadside management plans and roadway maintenance practices. The taller grass slows the rate of runoff and will produce a deeper and denser root system.
Two common swale design alternatives, pretreatment grass filter strips and vegetated check dams, were compared during 52 storm events over 4. 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. A watershed is an area of land that drains to a receiving body of water. Highway runoff may be a potential threat to receiving waters in your area, but if. Prevent illicit discharge because there is generally no treatment of storm water before it enters into a receiving stream, any illegal connection, dumping or tiein to a storm sewer is considered an illicit discharge. Replace part of your lawn with native, droughtresistant plants. American association of state highway and transportation officials. Design manual update information latest design manual revision package. The highway runoff manual hrm is an integral part of the wsdot npdes municipal stormwater permit permit.
While many stormwater bmps are superior to lawns in terms of a positive impact on water quality, a healthy lawn can be a great place for recreation and be part of an environmentallyfriendly landscape. Size facility to infiltrate sufficient volumes so that the overflow matches the duration standard, and check the 100year peak flow to estimate the potential for. 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. Shorter and smaller conveyances can be designed to carry runoff to nearby holding areas.
If you are on a septic system, maintain the system. The time series is from october 1949 to september 2008. The subgroup will be consulted as wsdot begins to form ideas for its next round of highway runoff treatment bmps. Highway runoff manual washington state department of. Introduction chapter 1 page 12 highway runoff manual m 3116. Hydraulics highway runoff manual additional guidance. Lawns and landscaped areas specified are pervious but also generate.
Add compost to planting soil and dress it with mulch to improve plant growth and reduce stormwater runoff. Evaluation of best management practices for highway runoff. A stormwater friendly lawn is one that can absorb rainwater and does not harm local streams due to the overapplication of chemicals. Wsdot s coverage under the 1995 phase i municipal general permit for large and mediumsized areas to include small urban areas throughout the state. For the latest covid19 health guidance, statistics and resources, visit coronavirus. Projects going to ad after march 6, 2020 shall comply with. When backpacking, bury human waste in a hole eight inches deep and at least 55 yards from a water source. Then, participate in the dont mess with texas and adoptahighway programs. When playing at the beach, change a babys diaper before swimming and use swim diapers for infants. This bmp is derived from the wsdots highway runoff manual and. An effort was required to implement these results in.
The manual focuses on design modifications to decrease the attractiveness of stormwater facilities to wildlife rather than active wildlife removal measures. Highway runoff manual wsdot pdf free online publishing. Deeper roots have access to more water stored in the ground and can reduce irrigation need during droughts. 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. Stormwater practices research project final report vtrans. He has sent her some detailed concerns that she will be sharing with ecology. Lawns require a lot of watering, mowing and caring. Design tool for controlling runoff and sediment from.
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. Nonpoint source pollution accounts for 80 percent of the degradation of waters in the united states. 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. 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. Wash your car on your lawn so excess water, chemicals and dirt are filtered through grass and vegetation. Washington state department of transportation wsdot. 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. 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. Number of highway runoff emcs per epa rainfall zones from nsqd and.
Hydraulic performance of grass swales for managing highway. Stormwater runoff from highways article pdf available in water air and soil pollution 254. Guidance manual explores practices for the reduction of stormwater volumes in urban highway environments. Assessing impacts of state highway stormwater runoff on stream invertebrate communities contents acknowledgements ii abbreviations and acronyms ii foreword iii historical perspective on transport stormwater run off iii executive summary 1 1 introduction 4 1. 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. Quite simply, stormwater is runoff that flows into pipes, ditches, streams, and other receiving water bodies. Septic systems require regular inspections, mainte. The hydraulic performance of grass swales as a highway stormwater control measure was evaluated in a fieldscale study adjacent to a maryland highway. Chapter 1010 youtube video chapter 1120 youtube video chapter 1610 youtube video request copies of the presentation powerpoint files by emailing dustin saunders at dustin. Design tool for controlling runoff and sediment from highway. Trbs national cooperative highway research program nchrp report 565. Evaluation of best management practices for highway runoff control examines best management practices for highway runoff control. Wsdot media filter drain from june 2008 edition of the wsdot highway.
How well a retrofit improved water quality in a typical urban basin. An effort was required to implement these results in the departments procedures. First, consult chapter 2 of volume i to determine core requirements for stormwater treatment and flow. Heather trim noted for the group that jan hasselman with earthjustice is concerned about the work the group is doing. Hydraulic performance of grass swales for managing highway runoff. Wsdots coverage under the 1995 phase i municipal general permit for large and mediumsized areas to include small urban areas throughout the state. The department of ecology reissued the permit, on april 5, 2019.
The report outlines a fivestep process for the identification, evaluation, and design of solutions for runoff volume reduction based on sitespecific conditions. 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. Beyond the highway new hampshire road project makes the environment a priority in october 2015, the new hampshire department of transportation nhdot widened and reconstructed a 1. 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. Highway runoff manual transportation research board. The highway runoff manual hrm was developed to direct the planning and design of. 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. 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.