Kelani Ganga basin is the 7th largest watershed in Sri Lanka, spanning over 2,292 km2, with a length of 145 km, and annually discharging 4,225 MCM flow to the sea. The annual average rainfall varies from 2000 mm to 5700 ...

Most common method of accounting spatial variability of rainfall in hydrologic modelling is with the use of Thiessen Weights whereas some authors consider it illogical as it can result in biased distribution of rainfall. ...

Since the magnitude and temporal distribution of rain events directly influence the streamflow in watersheds, due focus should be given when selecting the most appropriate storm patterns for the design of hydraulic structures. ...