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    <title>Transport Research International Documentation (TRID)</title>
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    <atom:link href="https://trid.trb.org/Record/RSS?s=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" rel="self" type="application/rss+xml" />
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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>Transport Research International Documentation (TRID)</title>
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      <title>Computational Analysis of Hydraulic Efficiency of Michigan DOT Covers J and K</title>
      <link>https://trid.trb.org/View/2764016</link>
      <description><![CDATA[Drainage structures are used in urban street and highway systems to capture stormwater runoff. These structures typically consist of catch basins fitted with grates, inlets, or combination grate/inlet configurations that collect runoff and convey it through buried drainage systems. They are strategically placed within curb-and-gutter systems to enhance public safety by efficiently removing water from roadways and thereby reducing the risk of hydroplaning. The performance of drainage structures is commonly evaluated in terms of hydraulic efficiency, defined as the percentage of flow captured by the basin relative to the total flow reaching the structure. Understanding the hydraulic performance of these structures allows designers to properly space inlets, resulting in cost-effective designs that also help ensure the safety of the traveling public. MDOT uses a variety of drainage structures for runoff capture, as documented in Michigan Department of Transportation (MDOT) Drainage Manual [1]. Many of these structures incorporate sinusoidal-type grates that are not addressed in HEC-22 [2]. Because physical modeling of these structures has been limited, further analysis is needed to verify their capture efficiency. Under current MDOT practice, the capture efficiency of these grates is estimated by assuming performance similar to that of a comparably sized reticuline grate described in HEC22. The first phase of this effort, titled Computational Analysis of Hydraulic Efficiency of Michigan DOT Cover C, focused on evaluating the hydraulic performance of MDOT’s Cover C grate. Cover C was selected as the initial test candidate because its sinusoidal pattern is representative of other MDOT grates, while it is typically used in high-volume, higher-speed applications. A similar version, Cover CX, is used on interstate highways but does not include transverse bars for bicycle safety. The current second phase of the study expands this work to evaluate MDOT’s Covers J and K. These grates were selected for additional analysis to further assess the hydraulic performance of MDOT drainage structures that are not directly represented by grate configurations in HEC-22. The results of this phase will build on the findings from the Cover C analysis and support improved understanding of the capture efficiency of MDOT’s standard drainage grates. This report is intended to serve as a companion document to the earlier study, Computational Analysis of Hydraulic Efficiency of Michigan DOT Cover C [3]. The present work applies the same overall CFD-based evaluation approach to MDOT Covers J and K and compares the resulting performance trends with those previously identified for Cover C. In particular, both studies assess on-grade interception efficiency, sag-location hydraulic capacity, and the effects of partial obstruction relative to HEC-22-based design estimates.]]></description>
      <pubDate>Tue, 08 Sep 2026 10:49:50 GMT</pubDate>
      <guid>https://trid.trb.org/View/2764016</guid>
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    <item>
      <title>CFD Modeling of an 81" Single Slope Barrier Wall Drainage Window for on Grade and Sag Conditions</title>
      <link>https://trid.trb.org/View/2764018</link>
      <description><![CDATA[The main goal of this study is to design a drainage window in an 81" single slope barrier wall for on-grade and sag conditions that could replace the standard Ohio Department of Transportation (ODOT) I-3 barrier catch basin. The ODOT design guidelines are as follows: (1) Examine configurations of the opening to the flume behind the wall under the wall section to maximize conveyance of flow to a roadside ditch section. (2) Examine window lengths and configurations to maximize hydraulic efficiency on a grade up to an absolute maximum window length of 20 ft. (3) Use a minimum opening height of 4 in. and consider tapering to an increased height at the outlet to the flume to reduce the potential for debris clogging beneath the barrier section. On-grade locations are analyzed for longitudinal slope up to 5% and spread up to 10 ft. Sag locations, represented by pavement at zero longitudinal slope, are analyzed for water depths up to 18 in. The roadway cross section consists of a 10-ft shoulder at a 4.0% cross slope and pavement at a 1.6% cross slope. All surfaces are represented with Manning’s n = 0.015. Computational fluid dynamics (CFD) is used to perform the analysis. The modeling approach follows previous studies by the authors. The new design is similar to a slotted inlet: a rectangular opening cut into the bottom of a barrier (e.g., a temporary barrier or single slope barrier wall), which typically has a uniform cross section. Findings from laboratory tests of flow under Florida DOT barrier walls were used for additional validation of the modeling approach used in this study.]]></description>
      <pubDate>Fri, 28 Aug 2026 14:41:12 GMT</pubDate>
      <guid>https://trid.trb.org/View/2764018</guid>
    </item>
    <item>
      <title>Computational Study of Hydraulic Performance of South Carolina DOT Catch Basins Type CB 1, CB 16, and CB 17</title>
      <link>https://trid.trb.org/View/2764025</link>
      <description><![CDATA[This report is a computational study of the design of surface drainage of roadways with the aim of  is minimizing flooding while maintaining traffic safety. Excess storm water is collected by inlets from the drainage area of roadways which then discharge the water into storm drains. Hydraulic efficiency of inlets is defined as the percentage of intercepted flow directed to the total street flow, and is necessary for optimal drainage design and spacing of inlets so the system transports all or the majority of the road surface flow during rain events off of the road into the catch basins.]]></description>
      <pubDate>Thu, 27 Aug 2026 16:51:55 GMT</pubDate>
      <guid>https://trid.trb.org/View/2764025</guid>
    </item>
    <item>
      <title>Computational Analysis of Hydraulic Capacity of Ohio DOT Catch Basin No. 6 in On-Grade and Sag Locations</title>
      <link>https://trid.trb.org/View/2764019</link>
      <description><![CDATA[In the previous study by Argonne for the Ohio Department of Transportation (ODOT), the authors analyzed two catch basins with a combination inlet in sag and on-grade locations. The authors reviewed  ODOT design procedure and compared it with the equations presented in FHWA Hydraulic Engineering Circular 22 “Urban Drainage Design Manual”. The ODOT design procedure and HEC-22 procedures are found to be sufficient for more extreme events at on-grade locations. In this phase of the study, ODOT catch basin no. 6 was analyzed in both on-grade and sag locations configured with two grates, a curved vane grate, and a parallel bar. The catch basin interception was compared with hydraulic and geometric conditions. This research paper presents a validated methodology for evaluating the efficiency of present-day grates, allowing ODOT to provide safe, efficient designs for drainage systems. The results of this study will be applied to ODOT policy, design procedures and software, and institutional knowledge.]]></description>
      <pubDate>Thu, 27 Aug 2026 16:51:55 GMT</pubDate>
      <guid>https://trid.trb.org/View/2764019</guid>
    </item>
    <item>
      <title>Evaluation of NDOT's Construction Stormwater Detention Measures Using Full-Scale Testing Techniques</title>
      <link>https://trid.trb.org/View/2714464</link>
      <description><![CDATA[Sediment is a leading pollutant in waterbodies, contributing to turbidity, pollutant transport, ecological degradation, and reduced flow capacity. Construction activities are major sources of sediment-laden runoff, necessitating regulatory compliance through Stormwater Pollution Prevention Plans. This study developed a full-scale testing methodology simulating Nebraska hydrologic conditions to evaluate the performance of Nebraska Department of Transportation silt traps and sediment traps at the Auburn University Stormwater Research Facility. Results showed that standard installations can be significantly improved through design modifications. For silt traps, pairing with a modified V-shaped, wire-backed silt fence with a central weir achieved the highest sediment retention (95.9%), substantial total suspended solids (TSS) reduction (89.1%), and turbidity reduction (67.7%). A slash mulch berm also performed well but may be limited by material availability. Structural testing of the low porosity silt fence indicated that reduced post spacing and fence height improved durability. For sediment traps, the use of coir baffles and a surface skimmer enhanced flow control, reduced turbulence, lowered downstream TSS and turbidity, and retained sediment (91.1%). Overall, optimized configurations significantly improved sediment capture and downstream water quality, supporting refined design recommendations for effective sediment control practices.]]></description>
      <pubDate>Wed, 24 Jun 2026 17:03:20 GMT</pubDate>
      <guid>https://trid.trb.org/View/2714464</guid>
    </item>
    <item>
      <title>Optimizing Runoff Control – Cooling Co-Benefits of Green Stormwater Infrastructure: Insights from High-Density Residential Areas</title>
      <link>https://trid.trb.org/View/2681829</link>
      <description><![CDATA[With the challenges of climate change and rapid urbanization worldwide, cities are increasingly exposed to environmental extremes such as urban floods and heat waves. In this context, Green Stormwater Infrastructure (GSI) has been widely adopted in urban planning due to its effectiveness in runoff mitigation. However, the extent to which different GSI types—such as bioretention cells (BC), pervious pavement (PP), and green roofs (GR)—can also deliver urban cooling benefits, and how their combinations optimize co-benefits, remains underexplored. This study evaluated cooling performance of three GSI combinations with varying runoff control capabilities in a high-density, high-rise residential area in Nanjing, China. All tested GSI combinations (GR + BC, PP + BC, GR + PP + BC) significantly reduced ambient thermal conditions during daytime hours. Notably, the PP+BC combination exhibited the highest co-benefits potential, achieving a 90% runoff reduction while lowering surface temperature by up to 2.75°C and physiological equivalent temperature by up to 1.79°C. Further analysis of factors influencing these co-benefits revealed that while a higher proportion of permeable surfaces can enhance the cooling effect, the percentage of impervious surfaces negatively impacted GSI cooling performance. In terms of cost-effectiveness, the PP+BC combination achieved the greatest cooling efficiency, reducing temperature by 2.34°C per million USD invested while maintaining superior runoff control. These findings underscore the integrated hydrological and microclimatic benefits of GSI and offer actionable insights for climate-resilient urban design and the sustainable renewal of high-density neighborhoods.]]></description>
      <pubDate>Wed, 17 Jun 2026 16:13:02 GMT</pubDate>
      <guid>https://trid.trb.org/View/2681829</guid>
    </item>
    <item>
      <title>Use of Small UAVs for Field Measurement of Hydraulic Parameters in Small Drainage Basins</title>
      <link>https://trid.trb.org/View/2680119</link>
      <description><![CDATA[This project evaluated the feasibility, accuracy, and practical use of small unmanned aerial vehicles (UAVs) for measuring hydraulic parameters, water-surface elevation (WSE), surface velocity, bathymetry, and discharge, in small to medium Missouri drainage basins. UAV-based measurements offer non-contact alternative to traditional field methods in hazardous environments or high-flow conditions. A comprehensive literature review of 522 publications (2010–2024) was conducted and found that reported errors showed radar-based WSE and hyperspectral/multispectral bathymetry as the most accurate, while Particle Tracking Velocimetry (PTV) showed the highest accuracy with a mean absolute percentage error (MAPE) of 10.7%, while the surface velocity method (SV) yielded the lowest discharge error (MAPE = 12.4%). For the field studies in the next phase, six field sites were selected from 21 candidate locations, to represent diverse channel and hydrologic conditions. Five sites were surveyed using UAV photogrammetry, Light Detection and Ranging (LiDAR), Particle Image Velocimetry (PIV)/PTV, and sonar-based bathymetry. Discharge was estimated using geometric method (GM) and surface-velocity approaches (SV). GM used LiDAR geometry, bathymetry, roughness, and slope, while SV used PIV/PTV at all sites. UAV-based discharge estimates showed 22.2–25.3% difference relative to USGS rating curves. SV produced more consistent accuracy across sites, while GM was highly sensitive to roughness and geometry. SV is recommended when field time is limited, and GM when detailed channel data are available.]]></description>
      <pubDate>Mon, 23 Mar 2026 08:34:48 GMT</pubDate>
      <guid>https://trid.trb.org/View/2680119</guid>
    </item>
    <item>
      <title>Leveraging High-Resolution LiDAR and Stream Geomorphic Assessment Datasets to Expand Regional Hydraulic Geometry Curves for Vermont</title>
      <link>https://trid.trb.org/View/2669640</link>
      <description><![CDATA[In the two decades since Regional Hydraulic Geometry Curves (RHGCs) were first developed for Vermont streams, new remote-sensing data have been generated including digital elevation models derived from Light Detection and Ranging (lidar) data, and stream geomorphic assessments have been completed for more than 2,300 miles of river. Availability of these new data sets represented a cost-effective opportunity to revisit the analysis to update RHGCs for Vermont rivers without the need to engage in resource-intensive field work. We sought to improve upon the RHGCs, by (1) expanding the number of observations, and (2) reducing the variability in the relationships between drainage area and each of the response variables, bankfull width, mean depth, and cross-sectional area. To do so, we leveraged stream geomorphic data collected from 2005 through present; as well as high-resolution lidar data for estimation of basin characteristics. With the addition of 10 new sites, RHGCs have been expanded to cover drainage areas up to 396 (from 194) square miles. Additionally, stratification of the curves by channel slope at a threshold of 0.1% has improved prediction of bankfull width as a function of drainage area. Use of updated curves to design more geomorphically-compatible bridges and culverts will lead to greater resilience and durability of these transportation structures during extreme flood events. Greater longevity of structures translates to improved benefit-cost ratios when the full life cycle of these structures is analyzed and compared to that of undersized structures. Geomorphically-compatible structures also have co-benefits of supporting aquatic and terrestrial organism passage objectives.]]></description>
      <pubDate>Mon, 02 Mar 2026 13:24:07 GMT</pubDate>
      <guid>https://trid.trb.org/View/2669640</guid>
    </item>
    <item>
      <title>Diagnosis of the Problem Situation Related to the Retention of Stormwater From Road Surfaces in Poland</title>
      <link>https://trid.trb.org/View/2643349</link>
      <description><![CDATA[This study examines the challenges and potential solutions associated with the retention of stormwater from road surfaces – a critical component of urban infrastructure in the face of climate change. The research highlights that intensified urbanisation and the increasing prevalence of extreme weather events have exacerbated issues related to rapid rainwater runoff, leading to urban flooding and infrastructural degradation. Employing quantitative empirical methods, a survey was conducted among 362 road infrastructure managers in Poland, assessing the technical condition of roads, drainage system performance, and the barriers to adopting modern retention and infiltration solutions. Findings reveal a mixed perception of current drainage performance, with many respondents reporting inadequate solutions that compromise both safety and sustainability. Key barriers include high implementation costs, technical and infrastructural challenges, resistance to change, and limited public awareness. The results underscore the necessity for modern, integrated stormwater management practices that not only protect infrastructure but also enhance urban water balance and sustainability.]]></description>
      <pubDate>Tue, 24 Feb 2026 09:01:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/2643349</guid>
    </item>
    <item>
      <title>Optimization of Sediment-Basin Configurations Using Intermediate-Scale Testing</title>
      <link>https://trid.trb.org/View/2630579</link>
      <description><![CDATA[To better understand the performance of sediment basins, intermediate-scale experiments were conducted to examine performance impacts based on a sediment basin’s volumetric and geometric properties. Additionally, various treatment methods were evaluated to assess their effects on sediment capture, including baffles, silt-fence serpentine baffles, a level spreader, and chemical flocculants. Three intermediate-scale trapezoidal basins, Basin A (length twice the width, 2L:1W) with a volume of 0.43?m3 (15.3?ft3), Basin B (10L:1W) with a volume of 0.38?m3 (13.5?ft3), and Basin C (2L:1W) with a volume of 0.20?m3 (7.0?ft3), were designed and evaluated in a controlled environment. Basins A and B, reflecting typical volumetric sediment-basin designs with coir-baffle treatment and a skimmer, captured 88% of the introduced sediment. The inclusion of coir baffles enhances sediment capture by up to 10%. Basin C achieved 91% sediment retention using a single coir baffle and chemical flocculants. One-hundred-percent-natural coconut coir-fiber baffles were used within this study to spread the inflow across the width of the basin, which dissipates the energy of the inflow. These coir baffles are typically used within sediment basins for this purpose and to provide a conventional best management practice to be used in conjunction with chemical flocculant introduction. This study indicated that using a reduced basin volume along with chemical flocculants may provide equivalent or greater sediment capture than do typical basin designs with larger volumes, providing substantial cost savings.]]></description>
      <pubDate>Wed, 26 Nov 2025 09:23:39 GMT</pubDate>
      <guid>https://trid.trb.org/View/2630579</guid>
    </item>
    <item>
      <title>Road salt reduces plant cover in bioretention systems within road rights-of-way</title>
      <link>https://trid.trb.org/View/2578430</link>
      <description><![CDATA[Bioretention systems for managing urban runoff rely on healthy plants to reduce runoff and nutrient pollution via evapotranspiration and uptake. However, loss of plant cover is common and, in cold climates, potentially caused by the application of road salt. To investigate the impact of road salt on bioretention systems, the authors measured salt concentrations in the media and plant tissues and assessed plant cover at 19 sites in Toronto, Canada, in the field. Winter road salt was identified as the primary driver of plant cover loss: low-tolerance species accumulated excessive sodium and chloride, resulting in chlorotic and necrotic damage even under moderate salinity (median electrical conductivity (EC), 0.31–0.35 mS/cm, as measured in soil–water suspensions). Continuous EC monitoring showed no net salt buildup in any season, although salinity peaked in winter and was lower in summer. Low-tolerance species exhibited high salt ion uptake and substantial damage from legacy salt retained in the media. Although species-specific ion accumulation patterns were observed, they did not always align with species salt tolerance as described in the literature. Among the 14 species studied, Hemerocallis ‘Happy Returns’ (low tolerance) and Panicum virgatum (medium tolerance) significantly accumulated sodium, up to 2126 and 586 mg/kg, respectively, whereas Salvia officinalis (medium tolerance) significantly accumulated chloride (up to 20 mg/g); yet only Panicum virgatum displayed minimal damage (<5 %), while Hemerocallis ‘Happy Returns’ and Salvia officinalis displayed >50 % damage. These findings underscore the importance of selecting salt-tolerant species to ensure long-term bioretention performance.]]></description>
      <pubDate>Fri, 26 Sep 2025 13:39:55 GMT</pubDate>
      <guid>https://trid.trb.org/View/2578430</guid>
    </item>
    <item>
      <title>Effects of Regulation on L-Moments of Annual Peak Streamflow in Texas</title>
      <link>https://trid.trb.org/View/2570753</link>
      <description><![CDATA[Several techniques exist to estimate annual peak-streamflow frequency for streamflows that have recurrence intervals ranging from 2 to 500 years for natural (unregulated) drainage basins in Texas. Unfortunately, such techniques have limited applicability in regulated basins. There are numerous regulated basins throughout Texas, which has more than 7,000 dams that are identified by Texas Natural Resource Conservation Commission permits. The effects on annual peak streamflow from reservoirs created by these dams range from negligible to the complete suppression of the flood hydrograph; also, reservoirs can artificially create flood-like hydrographs. The large number of reservoirs and their widespread distribution in Texas necessitate an assessment of flood characteristics in regulated basins. Therefore, the U.S. Geological Survey, in cooperation with the Texas Department of Transportation, conducted a study of the effects of regulation on L-moments of annual peak streamflow in Texas. For this report, the State was divided into three regions. Four regression equations to estimate the L-moments of natural annual peak-streamflow data for ungaged sites were derived for each region from data for 367 streamflow-gaging stations in natural basins. The explanatory variables in the equations are contributing drainage area, basin shape factor, and stream slope. The effects of regulation on the L-moments of annual peak-streamflow data were determined by analysis of maximum and normal storage-capacity data from reservoirs for 96 streamflow-gaging stations in variously regulated basins. The results indicate that as potential flood storage (defined by the difference between total maximum and normal capacity) in a basin increases, the mean annual peak streamflow decreases nonlinearly. Evidence strongly indicates (despite contrary expectation) that the higher L-moments (coefficient of L-variation, L-skew, and L-kurtosis) are unaffected by regulation.]]></description>
      <pubDate>Sat, 30 Aug 2025 16:09:36 GMT</pubDate>
      <guid>https://trid.trb.org/View/2570753</guid>
    </item>
    <item>
      <title>Development of Biochar Specification Criteria as Soil Amendment for Slopes, Conveyances and Stormwater Treatment Systems (Phase 1)</title>
      <link>https://trid.trb.org/View/2582138</link>
      <description><![CDATA[The objective of this project is to develop knowledge, tools, and protocols to inform best practice standards for effective implementation of biochar in bioretention systems (BRSs) for treating roadway runoff. This project will be performed in two phases, with the first phase (this report) focusing on biochar production, characterization, and contaminant sorption performance. Results from the first phase will inform decisions for the second phase which will look at vegetation growth studies and soil hydrology evaluations. The authors anticipate the primary project output (following completion of Phase 2) to be a tool or protocol (e.g., a decision-making matrix) to provide standardized guidance for best practices regarding the practical implementation of biochar in BRSs treating roadway runoff. The work plan for Phase 1 is presented herein, which will result in following outputs: 1. Recommendations for locally available, suitable biomass feedstocks and feedstock-specific pyrolysis conditions which can be reproduced at scale. 2. Biochar physical property specification criteria associated with contaminant-removal targets which can be assessed at reasonable costs. 3. Protocols for screening-level contaminant-removal performance tests based on broadly accessible materials and methods. 4. Plans for further evaluations to verify treatment performance and evaluate hydraulic and soil health effects, to be proposed as a part of Phase 2 investigations.]]></description>
      <pubDate>Thu, 31 Jul 2025 09:19:24 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582138</guid>
    </item>
    <item>
      <title>Identifying Opportunities to Improve Temporary Sediment Basin</title>
      <link>https://trid.trb.org/View/2582218</link>
      <description><![CDATA[Temporary sediment basins are used to control the release of sediment laden stormwater runoff from active construction sites. If temporary sediment basins are constructed according to specifications, it is expected that 60% of sediment will be trapped by the sediment basin. Nonetheless, sediment basins can perform poorly in several instances such as in successive storm events, at sites with fine-grained soils, or due to maintenance issues. Releases of sediment laden stormwater runoff from construction sites can negatively impact the environment and require costly and sometimes time-consuming corrective actions. This project will identify common issues with sediment basins in Virginia and determine potential alternative designs to evaluate for future use in Virginia. First, interviews of Virginia’s National Pollutant Discharge Elimination System and Environmental Compliance Inspectors as well as personnel from other state departments of transportation (DOTs) will be conducted. Interviews will provide insights into potential common issues with sediment basins as well as opportunities for knowledge transfer. Then, select active sediment basins will be observed to better understand design limitations and contractor installation and maintenance practices. This research benefits the Virginia Department of Transportation (VDOT) by identifying potential sediment basin design shortcomings in Virginia, possible design modifications, and potential opportunities for knowledge transfer.  This research also establishes a basis for future research on potential temporary sediment basin design modifications to improve their performance. ]]></description>
      <pubDate>Sun, 27 Jul 2025 10:41:28 GMT</pubDate>
      <guid>https://trid.trb.org/View/2582218</guid>
    </item>
    <item>
      <title>Temporal Evolution of Stormwater Basin Soil Properties and Infiltration Rates</title>
      <link>https://trid.trb.org/View/2566016</link>
      <description><![CDATA[Maintaining the soil infiltration capacity of stormwater infiltration practices is essential to long-term performance and resilience to changing land use and climate conditions. To date, however, the ability to predict how infiltration capacities change over time has been limited by a lack of understanding of how soil properties evolve with the age of the practice and the associated impacts on infiltration rates. To address this limitation, this study measured soil properties and infiltration rates in 28 stormwater infiltration basins ranging in age from 2 to 20 years. Soil organic matter, clay content, and silt content increased with age, while bulk density decreased with age, indicating both vegetation and soil biota activity and fine sediment accumulation contribute to soil profile evolution. Infiltration rates decreased with age, with a precipitous decline at approximately 12 years. Silt content was the best predictor of infiltration rate. However, age alone provided some predictive power, allowing infiltration practices to be prioritized for inspection and maintenance based on age. Visual indicators of basin failure included the presence of hydric soils, ponding, sediment accumulation, impaired vegetation, and presence of wetland vegetation. Therefore, a combination of age, visual inspection, and measurement of soil properties and infiltration rates is recommended to identify practices for rehabilitation. Inspection at 5-year intervals is recommended and is consistent with the requirements of the Minnesota Department of Transportation (MnDOT) MS4 permit.]]></description>
      <pubDate>Wed, 16 Jul 2025 09:51:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/2566016</guid>
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