Patent ID: 8517633

Claim:
A method for preventing and controlling debris flow, comprising: determining a peak discharge Q Total of debris flow in compliance with a design standard, according to the floodmark investigation of historical debris-flow hazards or hydrological calculation of small watershed; determining a peak discharge Q Drainage of debris flow which can be drained to a main river via one or more drainage channels of debris flow according to the transport capacity of the main river; when Q Total ≦Q Drainage , adopting the drainage works for the prevention and control of debris flow ; when Q Total >Q Drainage , adopting both the drainage works and the blocking works for the prevention and control of debris flow, and determining a peak discharge Q Block of debris flow which is reduced through stability and blocking according to the blocking works at the upper and lower reaches of the watershed; when Q Total ≦Q Drainage +Q Block , adopting both the drainage works and the blocking works for the prevention and control of debris flow; when Q Total >Q Drainage +Q Block , adopting the drainage works, blocking works and deposit stopping works for the prevention and control of debris flow, and determining a peak discharge Q Deposit in deposit stopping works with the calculation formula of Q Deposit =Q Total −Q Drainage −Q Block.