PURPOSE: A lattice-based large basin rainfall-runoff model is provided to resolve a problem caused by trial and error by applying an automatic correction method for setting an initial soil moisture condition. CONSTITUTION: A lattice-based large basin rainfall-runoff model includes a parallel processing method for quickly calculating the amount of large basin rainfall-runoff, a method for automatically correcting an initial soil moisture ratio, and an evapotranspiration rate calculating method. The lattice-based large basin rainfall-runoff model uses space sluice data as a parameter and tracks the amount of basin based on momentum theory. [Reference numerals] (AA) Building of input data; (BB) Initial setting; (C1) Rainfall data; (C2) Radar rainfall; (C3) Point-observation rainfall; (D1) Geographic information data; (D2) Thiessen map; (D3) Flow direction diagram; (D4) Land usage diagram; (D5) Soil diagram; (D6) Precise digital elevation; (E1) Parameter setting; (E2) Illuminance coefficient; (E3) Permeability coefficient; (E4) Infiltration rate; (E5) Soil depth; (E6) Porosity; (F1) Initial variable setting; (F2) Initialization of a variable; (F3) Input of data; (F4) Determination of a calculation order; (F5) Setting of an initial variable; (G1) Soil moisture estimation; (G2,H3) Calculation for an A layer; (G3,H4) Calculation for a B layer; (G4,H5) Calculation for a C layer; (G5,H6) Calculation for river; (G6) Determination of convergence; (H1) Rainfall-runoff analysis; (H2) Rainfall distribution; (II) MPI parallel calculation; (J1) Calculation result output; (J2) Surface runoff amount; (J3) River runoff amount; (J4) Soil moisture; (J5) Rainfall distribution diagram; (J6) Input parameter value; (J7) Flow accumulation diagram; (J8) River resistance value;
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