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The build-up of urban road deposited sediments is the key to study the quality of stormwater and receiving waterbody in urban catchments.In the past,many road sediment build-up studies were conducted in the field between 7 to 20 days with the assumption that the cumulative amount of pollutants would reach equilibrium and could be presented as a mono-growth curve.However,the dry period between two rain events in many areas might be much longer than 20 days.