· When you see withered plants or blackened soil around road run-off outlet it is due to harmful substances in road run-off
·As the domestic roads are constructed of impermeable materials such as asphalt or concrete, they can cause strong first flush even at a small scale of rainwater and pollutant concentration is also high.
· Road runoff includes not only miniscule particles but also debris such as fallen leaves, pieces of vinyl, wood splinters, plastics, cigarette butts, waste paper, thereby causing clogging of road drainage
·Currently installed storm-water inlets only serve to remove rainwater, but it should have a function to primarily remove particles and foreign matters in line with the increasing trend of mandatory reduction of road run-offs pollutant.
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