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Showing 1 to 20 of 48 for “"Culverts"”.
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Effects of Culverts on Brook Trout Genetic Diversity
… and stocking of non-native salmonids. Road culverts have been recognized as an additional impediment to population persistence as movement between diverse habitat types has been identified as an alternative life-history strategy to maximize spawning and growth. Brook trout were genetically …
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Fish Passage at UDOT Culverts: Prioritization and Assessment
… currently responsible for approximately 47,000 culverts, but AOP is currently addressed only on an as-needed basis. Currently UDOT has no prioritization or assessment strategy procedure for AOP at UDOT road-stream crossings. Historical fish passage strategies have focused on federally listed …
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Investigation of the Failure Mechanisms of Intact and Deteriorated Culverts
… different failure mechanisms on corrugated steel culverts. An accelerated corrosion technique was first developed to degrade multiple pipe specimens to different degrees of deterioration. A total of six deteriorated pipe specimens were created. Two dimensional maps of the remaining wall thickness …
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A Model Study of the Hydraulics Related to Fish Passage Through Embedded Culverts
… understanding of the hydraulics of embedded culverts. The results of this research may provide support to improving the methods of culvert installation with respect to fish passage requirements. The overall objective of the research program was to quantify the hydraulic conditions, which …
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Local effects of culverts on habitat features and fish assemblages in Blue Ridge streams
… at 10 stream sites: five sites contained culverts with artificial bottom substrates and five sites contained culverts with natural bottom substrates. On each stream, paired sampling reaches (reach length ~35 times mean reach width, drainage area <11 km 2) were established 50 m upstream and …
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Assessment of HEC-18 scour equations for bottomless culverts based on Kansas field data
… unstable and possibly collapse. Bottomless culverts have become an attractive bridge option and until recently studies to determine scour at their abutments are scarce. New studies have been conducted and need field review. The purpose of this report is to verify the validity of bottomless …
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Fish Ladders Designed for Drop Culverts and Central Stoneroller Ecology Across a Latitudinal Gradient
<p>Stream connectivity is essential for the persistence of fish populations and maintenance of fish assemblage structure. Stream-road crossings can become barriers resulting in a loss of connectivity. Creating innovative tools for fisheries managers to allow fish passage through barrier stream-road …
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3D GROUND-PENETRATING RADAR (GPR) INVESTIGATIONS: BURIED CULVERTS, HISTORICAL GRAVES, A SANDSTONE RESERVOIR ANALOG, AND AN IMPACT CRATER
… a variety of subsurface targets such as buried culverts, historical graves, reservoir analogs, and impact craters. In the first case of “buried culverts” I evaluated the GPR performance across five antenna frequencies to determine which would best image buried culverts. Laboratory measurements …
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The durability of precast concrete elements
… use of precast concrete elements. Precast box culverts are structurally significant units, subject to an important combination of bridge loadings. Culverts occasionally in contact with water pose a high durability risk. Despite this, the current specifications allow a reduction in cover to …
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Land Cover and Culvert Effects on Stream Physical Water Quality in West Central Georgia
… that are channelized, and added structures like culverts. In developed environments, culverts are widely used to transport rivers below human infrastructure. Although there is strong evidence that culverts cause downstream erosion and fragment populations of aquatic organisms such as fish, …
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Review of codes of practice for the design of box culverts for recommendation for South African Bureau of Standards (SABS)
… earth pressure in the design methodology of culverts as outlined in TMH7 – Code of Practice for the design of highways bridges and culverts in South Africa Part 2, AASHTO LRFD Bridge Design specification and the DMRB volume 2 section 2 part 12 - BD31/01. It involves the theoretical design and …
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Metal culvert renewal prioritization framework development: A study for Saskatchewan Highways
… province. Along these roads, over 26,500 culverts have been installed for passaging water flow. Some of which have been installed over a century ago with no recorded installation dates. The failure of culverts, caused by a wide range of factors such as environmental, structural, or …
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Wildlife Road Mortality on the 1000 Islands Parkway in South Eastern Ontario: Peak Times, Hot Spots, and Mitigation Using Drainage Culverts
… spots. In addition, the potential for drainage culverts to reduce wildlife road mortality was tested with two experimental treatments in 2010: (1) blocked culverts to prevent wildlife use, and (2) drift fence installation adjacent to culverts to encourage wildlife use. Wildlife road mortalities …
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Assessment of Culverts and Bridges as Roosting Habitat for Perimyotis subflavus (tri-colored bat) and Disease Transmission Corridors for Pseudogymnoascus destructans
… non-traditional habitat, such as interstate culverts, for roosting. To investigate their use of anthropogenic structures in coastal Georgia, an area where <em>P. destructans</em> has yet-to-be detected, comprehensive bridge and culvert surveys were conducted during the hibernation season. …
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An investigation of the relationships between inventory and inspection data of RC bridges and RC culverts in the Western Cape Province
Bridges and Culverts form critical links within transportation networks. They are costly long term infrastructure investments and are essential to a country’s economic functioning and society’s everyday lives. They are prone to deterioration due to unfavourable chemical, mechanical and physical …
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Waterfowl Production On Three Types of Artificial Nesting Structures in South Dakota Wetlands
… cone baskets, round hay bales, and concrete culverts – and evaluated their used, success, and production in South Dakota. Structure type and site characteristics were correlated to occupancy rates and nesting success. Sixty-eight baskets and 205 bales were monitored during 1986, and 154 …
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Waterfowl Use and Production of Artificial Nesting Structures and Hay Bales in South Dakota
… 6% for ducks, 36. 8% for geese), followed by culverts (21. 1% for ducks, 33. 3% for geese) and baskets (12. 8% for ducks, 11. 2% for geese). Nesting success averaged highest on culverts (91. 7% for ducks, 100. 0% for geese), followed by baskets (79. 4% for ducks, 96. 6% for geese) and bales …
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Assessing Efforts To Reduce Sediment Impacts In Cottonwood Creek, Blackfoot Basin, Montana
… surface erosion. The annual sediment yield from culverts predicted to fail within 20 years and from estimated road surface erosion modeled over ten years was much lower compared with the literature, even for undisturbed forests. Two hypothetical scenarios were compared—in one, culverts that were …
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