Initial rainwater runoff separation catchment ditch suitable for outdoor hardened pavement

The utility model discloses an initial rainwater runoff separation intercepting ditch suitable for an outdoor hardened pavement, and belongs to the technical field of initial runoff pollution control.The rainwater drainage system comprises an initial rainwater ditch and a rainwater ditch which are arranged in parallel and are close to each other, an initial rainwater groove is formed in the tailend of the initial rainwater ditch and communicated with a sewage drainage pipe, and a rainwater groove is formed in the tail end of the rainwater ditch and communicated with the rainwater drainage pipe. According to the initial rainwater runoff separation intercepting ditch suitable for the outdoor hardened pavement, due to the fact that the opening rates of the initial rainwater ditch grate andthe rainwater ditch grate are different, separation of initial rainwater runoff and middle and later rainwater runoff can be achieved, the pollutant load entering the water environment is reduced fromthe source, and the situati