The invention discloses a rainfall flood regulating
system which comprises a draining
aisle, a rainwater inlet is formed in the left end of the draining
aisle, an outlet for rainwater to be processed is formed in the right end of the draining
aisle, a draining opening is formed in the front side of the draining aisle, a draining control weir gate is arranged at the draining opening, and a first
level sensor is arranged in the draining aisle. A first regulation and
storage tank and a second regulation and
storage tank are arranged on the rear side of the draining aisle, a first overflow structure is arranged between the draining aisle and the first regulation and
storage tank, a second overflow structure is arranged between the first regulation and storage tank and the second regulation and storage tank, a front water passing channel is connected between the first regulation and storage tank and the second regulation and storage tank, a one-way
check valve is arranged on the front water passing channel, a submersible
sewage pump is arranged in the first regulation and storage tank, and the water outlet end of the submersible
sewage pump is connected with the draining aisle. Rainwater and the flood peak in the middle period are regulated in time while initial rainwater is separated,
pollution of the initial rainwater and city and town waterlogging are effectively prevented, and regulation and storage are safe and reliable.