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NDOT Research Blog

Product Evaluation Update: Three Stormwater Categories Eliminated

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 Product Evaluation Update: Three Stormwater Categories Eliminated 
At the last Product Evaluation Committee meeting three categories were eliminated from the NDOT Qualified Products List (QPL). This action was taken at the request of our Stormwater Section. The categories eliminated were:

  • 637.02.02  SILT FENCE
Notification letters will be sent out in the coming days to the vendors with products currently listed in those categories.


Nevada to Lead Wildlife Connectivity Pooled Fund Study

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 Wildlife Crossing

Nevada DOT is preparing to lead its first pooled fund research project in recent history. Wildlife Vehicle Collision and Habitat Connectivity Pooled Fund Study is expected to be a five-year project, and will conduct tasks to address partners’ needs.  For more information, see solicitation number 1438 at www.pooledfund.org or contact Nova Simpson, NDOT’s Northern Nevada Biological Supervisor, at nsimpson@dot.state.nv.us or (775) 888-7035.


Library Staff Attend UDOT Research Peer Exchange

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 Utah DOT

Library staff were honored to have the opportunity to participate in the recent research peer exchange hosted by Utah DOT in Salt Lake City. 

Our staff learned from several library programs including Arizona DOT, Minnesota DOT, Oklahoma DOT, Utah DOT and the National Transportation Library.   

In addition, we were able to share some of the things we're proud of that we’ve been doing here and and hope other libraries took away something from us. 

Thanks goes to Utah for doing such a great job organizing the exchange.  We’re looking looking forward to implementing some of the great ideas we learned from our colleagues!

NDOT Authors Published in National Research Publications

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 Journal of Wildlife Management    World Environmental and Water Resources Conference

NDOT is fortunate to have several nationally recognized experts who, in addition to their normal jobs, contribute to the greater transportation knowledge base by publishing their research work in national academic publications.  We are pleased to announce the department's latest authors, Nova Simpson (Environmental Services) and Brian Wilson (Hydraulics).

Nova Simpson, Lead Author
"Overpasses and Underpasses: Effectiveness of Crossing Structures for Migratory Ungulates" in Journal of Wildlife Management (online)
Wildlife crossing structures are an important tool in multiple ecosystems to allow safe passage for wildlife across roadways. We used mule deer (Odocoileus hemionus), a widespread species across diverse bioregions in western North America, to test hypotheses about efficacy of 2 different types of crossing structures for ungulates. We documented behavioral responses and use of overpasses and underpasses by mule deer. Crossing structures were used by mule deer immediately following construction and although all of the crossing structures were used, we observed greater passage rates at overpasses than underpasses. Wildlife crossing structures reduced habitat fragmentation and enhanced connectivity by allowing safe passage across US 93, making the highway safer for wildlife and motorists.

Brian Wilson, Contributing Author
"Design Storm Temporal and Spatial Rainfall Distributions from Radar and Rain Gauge Data Analysis in Nevada" in World Environmental and Water Resources Congress 2016: Hydraulics and Waterways and Hydro-Climate/Climate Change
This study presents analysis methodology and results of characterizing the spatial and temporal distribution of rainfall used for design purposes by the Nevada Department of Transportation (NDOT). An assumption of uniform rainfall over watersheds can lead to unreasonably large peak flow rates, especially in regions where rainfall is highly variable or isolated in areal extent. Analysis of actual storm events in terms of temporal and spatial distributions is expected to be more representative of rainfall experienced in Nevada, thus making design of drainage infrastructure more efficient.

New NDOT Research Report Explores LRFD Load Factors

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LRFD of Axially Loaded Drilled Shafts 

LRFD Resistance Factor Calibration for Axially Loaded Drilled Shafts in the Las Vegas Valley
Resistance factors for LRFD of axially loaded drilled shafts in the Las Vegas Valley are calibrated using data from 41 field load tests. In addition to the traditional implementation of Monte Carlo (MC) simulations for calibration, a more robust technique is investigated in which nested MC simulations are employed to capture the uncertainty associated with the interpretation of material properties from in-situ test data. Measures are also taken to improve design procedures regarding cemented sandy soils colloquially referred to as caliche. While caliche is common in Las Vegas, its potential contribution to resistance is dicult to predict using typical site investigation data and there is currently no consensus among local engineers regarding how it should be considered in design. Thus, an approach for treating caliche is proposed and compared to three other potentially viable methods. Overall it is found that the proposed design approach produces the most accurate nominal axial capacity predictions and the nested MC simulations yield lower resistance factors than traditional calibration procedures.
Read the full report.

QPL Update: Vendor responses due by 11/4/16

(Product Evaluation) Permanent link
All vendors of active products on the NDOT Qualified Products List (QPL) were sent a letter this week requesting an update of their product and contact information.  Vendor responses are due to the Product Evaluation Coordinator by 11/4/16 in order to maintain their listing on the QPL.

Research Library Joins LVIS

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The Research Library recently joined the Libraries Very Interested in Sharing (LVIS) interlibrary loan network.  LVIS is the largest free resource sharing network in the world-yes it is international.  With access to the collections of over 2,700 LVIS members worldwide, NDOT staff now have even more access to free interlibrary loan materials from all over the planet.  And as transportation research becomes more and more global, this only becomes more important.

Interlibrary loan (ILL) expands potential access to information for NDOT staff far beyond the confines of our little library (often it is the only way to obtain very obscure materials).  Since the beginning of 2016 ILL has saved NDOT over $2,000 in materials that we did not have to purchase.  Please contact the Research Library to take advantage of this powerful resource.