Background DOTs routinely receive requests to add new products and materials to their lists of approved products, including culvert repair products and materials used for road and bridge repair. Many…
FY2022 NCHRP PROBLEM STATEMENT OUTLINE 1. Problem Title Concrete Curing pH Level Impacts for Minimization of Harm to Aquatic Species 2. Background Construction and maintenance actions regularly require state Department…
Recent research findings identified 6PPD-quinone as the major agent responsible for exceptionally high levels of rapid mortality of adult Coho salmon in some urban streams. Lethal effects occurred in Coho…
The ultimate fate of some treated transportation stormwater runoff from BMPs is groundwater. Groundwater is a precious resource. If groundwater quality has become degraded from transportation BMP stormwater runoff, the…
Those conducting the proposed research will 1. Identify opportunities for a change in regulatory system approach at the national, state, and local levels. 2. Develop a set of model regulations/ordinances,…
TERI Administrator Note (2007): Funded as NCHRP Project 25-31 Hydraulic Modifications to Existing Drainage Infrastructure in Ultra-Urban Areas to Achieve Watershed Total Maximum Daily Loads The transportation community is faced…
Major and visible effects-such as shoreline alteration, reduced connection to adjacent upland, sediment filling-in, eutrophication, reduced oxygen levels, and altered fish populations-are attributable to roads altering coastal, lake, reservoir, pond,…
Algal blooms and excessive plant growth commonly plague lacustrine systems due to the buildup of phosphorus. While phosphorus is not a principal component in highway runoff, there may be areas…
Because hydrologic conditions around corridors are the result of transportation-system design processes, the major patterns of road hydrology are well documented. It is generally clear, for example, how highway hydrology…
Issue: Tests have shown that aquatic organisms have different tolerance thresholds to snow and ice control materials that are applied to roads, highways, and bridges. A major factor in terms of selecting…