Without adequate drainage, stormwater can accumulate on road surfaces creating safety hazards including vehicle hydroplaning, road spray, and obscured roadway markings. Therefore, it is essential for designers to have tools that accurately represent water accumulation, movement, and capture within the roadway environment so that criteria for allowable spread and depths on pavements for the applicable storm conditions can be met with confidence. This Technical Note (TechNote) addresses a subset of pavement drainage design on the performance of curb-opening inlets on grade. The full text of this document is available on the US FHWA web site at https://www.fhwa.dot.gov/publications/research/infrastructure/22061/22061.pdf
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