The present invention belongs to the technical field of water conservancy
engineering, and relates to a
flash flood prevention and control method based on the combination of dams, pipes and flood beaches. The possibility of extremely large flash floods is predicted according to the influence of underlying surface characteristics on
precipitation. According to target requirements, at least one
flash flood prevention and
control system connected in series with the river is selected on
a site to be constructed on the river. During the
flood season,
flash flood prevention and control is carried out through the flash
flood prevention and
control system. If it is not an extremely large flash flood, the flood is diverted through drainage pipes, and the flood is reduced by a flood-removing dry riverbed or a flood-removing beach, without leaving
surface runoff. If it is an extremely large flash flood, the flood in the flood-blocking reservoir is allowed to overflow over the dam, and the drainage
pipe diversion and extremely large overflow are allowed to enter the flood-removing dry riverbed or the flood-removing beach to dissipate energy and
discharge flood. After the flood, the flash
flood prevention and
control system is repaired. The present invention intercepts and stores
flood water by a dam, diverts and removes
flood water through pipelines and a dry riverbed, and then enters the downstream river channel, so that the risk of flash flood disasters is greatly reduced, so as to meet the basic standards for flash
flood prevention and control.