Hydrological modelling of chhokranala watershed using weather generator with SWATmodel

Soil and Water Assessment Tool (SWAT) model was used for simulating runoff and sediment yield of a small agricultural watershed (Chhokranala) using generated rainfall. The maps of watershed/sub-watershed boundaries, drainage networks, slope and soil texture were developed using a GIS. A supervised classification method was used for land use/cover classification from satellite imageries. Model simulated monthly rainfall for the period of five years (2001–05) was compared with the observations. Simulated monthly rainfall, runoff and sediment yield for the monsoon seasons of four years (2002–05) were also compared with their observed values. In general monthly averages rainfall predicted by the model was in close agreement with the observed monthly average values. Besides, simulated monthly average values of surface runoff and sediment yield using generated rainfall compared with observed values during the monsoon season of the years (2002–05). Results of this study revealed that the generated values of Rainfall, runoff & sediment yield using SWAT were in close agreement and this technique could be employed any watershed located in similar conditions.