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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Video Evaluation of Highway Drainage Systems</title>
      <link>https://trid.trb.org/View/1370375</link>
      <description><![CDATA[Since 1978, the concept of longitudinal edge drains along Iowa primary and interstate highways has been accepted as a cost effective way of prolonging pavement life. Edge drain installations increased over the years since 1978 reaching a total of nearly 3,000 miles by 1989. With so many miles of edge drain installed, the development of a system for inspection and evaluation of the drains became essential. Equipment was purchased to evaluate 4 inch diameter and geocomposite edge drains. Initial evaluations at various sites supported the need for a post construction inspection program to ensure that edge drain installations were in accord with plans and specifications. Information disclosed by video inspections in edge drains and in culverts was compiled on videotape to be used as an informative tool for personnel in the design, construction and maintenance departments. Video evaluations have influenced changes in maintenance, design and construction inspection for highway drainage systems in Iowa.]]></description>
      <pubDate>Mon, 28 Sep 2015 16:48:44 GMT</pubDate>
      <guid>https://trid.trb.org/View/1370375</guid>
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      <title>Pavement drainage and pavement-shoulder joint evaluation and rehabilitation</title>
      <link>https://trid.trb.org/View/1170201</link>
      <description><![CDATA[The objectives of this research were to i) evaluate the performance of pavement subdrainage systems, ii) study the behavior of moisture conditions below pavements, and iii) provide recommendations for improved drainage criteria based on analysis of field data. Existing and retrofitted subdrainage collector systems were inspected through external visual inspection in combination with a probe for internal inspection.  Distresses and deficiencies in construction observed were listed and compiled on video.  A methodology for inspection is presented that can be used by highway agencies in monitoring the condition, need for maintenance, and performance of collector systems. Pavements with various types of subdrainage systems were instrumented to monitor the effects of different parameters influencing flow.  The instrumentation package included pressure transducers, moisture blocks, thermistor probe, rain gauge, tipping bucket flow meter, and a data recording and storage system.  Laboratory investigations were conducted on subgrade and subbase samples collected from instrumented sites to assess their material and hydraulic properties.  Parameters obtained by fitting Brooks & Corey's model and Van Genuchten's model to experimental data have shown good correlations with measured values.  Data collected from instrumented sites show varying response rate and time of outflow with respect to precipitation for different types of pavements and collector systems.  Statistical analysis has shown significant influence of base permeability in addition to pavement and drain types on pavement outflow.  High correlations exist between precipitation and pore pressure underneath pavements.  Data from instrumentation and laboratory tests will help in calibrating and validating an analytical seepage program developed separately as part of this research project.]]></description>
      <pubDate>Thu, 23 Aug 2012 21:02:20 GMT</pubDate>
      <guid>https://trid.trb.org/View/1170201</guid>
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      <title>SUBSURFACE DRAINAGE SYSTEMS IN ROADWAY CONSTRUCTION</title>
      <link>https://trid.trb.org/View/474468</link>
      <description><![CDATA[The installation of subsurface drainage systems has been a common practice in roadway construction for many years.  Until recently, however, the ability to inspect and report on the condition of these systems once they are in place has been limited.  The use of a high-tech, closed-circuit video monitoring system for the inspection of subsurface drainage systems has been developed and utilized with a high degree of success.  The use of this system is beneficial for maintenance and rehabilitation of existing systems and as a quality control measure for new highway systems.  In an ongoing project for FHWA, video monitoring has identified crushed mainline drainage pipes in new systems that have yet to be open to traffic.  All of the components of this monitoring system can be easily operated by one person in the field.  Substantial cost savings can be realized by accurately identifying the specific areas that need repair rather than assuming that an entire system needs to be replaced in highway rehabilitation projects. Results from use of this new technology to date are presented here.]]></description>
      <pubDate>Mon, 08 Dec 1997 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/474468</guid>
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      <title>PAVEMENT DRAINAGE AND PAVEMENT-SHOULDER JOINT EVALUATION AND REHABILITATION. FINAL REPORT</title>
      <link>https://trid.trb.org/View/386585</link>
      <description><![CDATA[The objectives of this research were to i) evaluate the performance of pavement subdrainage systems, ii) study the behavior of moisture conditions below pavements, and iii) provide recommendations for improved drainage criteria based on analysis of field data.  Existing and retrofitted subdrainage collector systems were inspected through external visual inspection in combination with a probe for internal inspection. Distresses and deficiencies in construction observed were listed and compiled on video.  A methodology for inspection is presented that can be used by highway agencies in monitoring the condition, need for maintenance, and performance of collector systems.  Pavements with various types of subdrainage systems were instrumented to monitor the effects of different parameters influencing flow.  The instrumentation package included pressure transducers, moisture blocks, thermistor probe, rain gauge, tipping bucket flow meter, and a data recording and storage system.  Laboratory investigations were conducted on subgrade and subbase samples collected from instrumented sites to assess their material and hydraulic properties.  Parameters obtained by fitting Brooks & Corey's model and Van Genuchten's model to experimental data have shown good correlations with measured values.  Data collected from instrumented sites show varying response rate and time of outflow with respect to precipitation for different types of pavements and collector systems. Statistical analysis has shown significant influence of base permeability in addition to pavement and drain types on pavement outflow.  High correlations exist between precipitation and pore pressure underneath pavements.  Data from instrumentation and laboratory tests will help in calibrating and validating an analytical seepage program developed separately as part of this research project.]]></description>
      <pubDate>Fri, 08 Apr 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/386585</guid>
    </item>
    <item>
      <title>VIDEO EVALUATION OF HIGHWAY DRAINAGE SYSTEMS</title>
      <link>https://trid.trb.org/View/365935</link>
      <description><![CDATA[Since 1978 the concept of longitudinal edge drains along Iowa primary and Interstate highways has been accepted as a cost-effective way of prolonging pavement life.  Edge-drain installations have increased over the years, reaching a total of nearly 3,000 mi by 1989.  With so many miles of edge drain installed, the development of a system for inspection and evaluation of the drains became essential. Equipment was purchased to evaluate 4-in.-diameter and geocomposite edge drains.  Initial evaluations at various sites supported the need for a postconstruction inspection program to ensure that edge-drain installations were in accord with plans and specifications.  Information disclosed by video inspections in edge drains and in culverts was compiled on videotape to be used as an informative tool for personnel in the design, construction, and maintenance departments.  Video evaluations have influenced changes in maintenance, design, and construction inspection for highway drainage systems in Iowa.]]></description>
      <pubDate>Sun, 31 May 1992 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/365935</guid>
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