[PDF] Evaluation Of Effectiveness Of Three Types Of Highway Alignment Best Management Practices For Sediment And Nutrient Control eBook

Author : National Cooperative Highway Research Program
Publisher : Transportation Research Board National Research
Page : 148 pages
File Size : 25,22 MB
Release : 2006
Category : Science
ISBN :

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At head of title: National Cooperative Highway Research Program.

Author : Gordon Keller
Publisher :
Page : 0 pages
File Size : 10,22 MB
Release : 2023-11-30
Category :
ISBN : 9781998295333

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This Low-Volume Roads Engineering Best Management Practices Field Guide is intended to provide an overview of the key planning, location, design, construction, and maintenance aspects of roads that can cause adverse environmental impacts and to list key ways to prevent those impacts. Best Management Practices are general techniques or design practices that, when applied and adapted to fit site-specific conditions, will prevent or reduce pollution and maintain water quality. BMPs for roads have been developed by many agencies since roads often have a major adverse impact on water quality, and most of those impacts are preventable with good engineering and management practices. Roads that are not well planned or located, not properly designed or constructed, not well maintained, or not made with durable materials often have negative effects on water quality and the environment.

Author :
Publisher :
Page : 70 pages
File Size : 29,1 MB
Release : 2005
Category :
ISBN :

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The National Guide to Erosion and Sediment Control on Roadway Projects identifies the necessary tools and steps to design and implement effective erosion and sediment control plans (ESCPs) for road system planning, construction and maintenance in both urban and rural settings. The guide is intended to assist roadway authorities, consultants, contractors and regulators. This report will guide users in assessing ESCPs in terms of defining risk and level of effort, selecting appropriate methodologies for analysis and design, selecting appropriate mitigation measures in the form of best management practices (BMPs), and meeting legislative and regulatory requirements. Where possible, the Guide highlights regional differences in soil, vegetation and climate conditions and environmental receptors that must be considered when developing an ESCP. The Guide is divided into two parts: Theory and Application. Sections included under Theory are: physical processes, legislation, and risk assessment. Sections included under Application are: ESCP development, site assessment, BMP selection and design, and implementation.

Author : Erica D. Kemp
Publisher :
Page : 93 pages
File Size : 16,30 MB
Release : 2015
Category : Forest roads
ISBN :

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Unpaved roads are a critical form of infrastructure in forested landscapes but also a potential source of fine sediment that can degrade sensitive ecosystems nearby. Improved management of aggregate road surfacing can reduce sediment generation, lengthen its useful life span, reduce maintenance costs, and more importantly, mitigate the impacts of road sediment on hydrologically connected ecosystems. This study investigated three road construction treatments and evaluated their performance based on runoff water quality, aggregate load distribution, and practicality of widespread application. Treatments included an aggregate-only control (no treatment), a biomass waddle-type filtration bale, and a geotextile-wrapped filter sand berm with a geogrid underlay. Two different aggregate varieties were used totaling six road treatment sections. The biomass filtration bale provided no discernable filtration benefit from road aggregate sourced runoff. The geotextile-wrapped sand filtration berm produced variable results in the field, but follow-up laboratory testing indicated a substantial reduction in effluent turbidity. The geogrid reinforcement effectively reduced subgrade stress and increased aggregate bearing capacity. Testing took place on a reconstructed unpaved forest road test track in Dunn Research Forest, Oregon, USA. A worst-case sediment scenario was produced with simulated rainfall and heavy truck traffic to mimic wet-weather timber hauling. Ditch runoff was collected to determine filtration effect of each road treatment and surface aggregates were testing for degradation through time to determine rate of sediment generation. Field testing was performed during June and July, 2015. Data analysis is ongoing and preliminary findings are presented herein. Hydrologic relationships and aggregate degradation rates are consistent with contemporary research. These agreements provide a metric for validating the highly-controlled experimental design. Investigators are currently developing recommendations for new best management practices employing the use of geotextile materials in unpaved forest road construction as a means of improving water quality of runoff, and aggregate performance.