The tradition has a double meaning, offering water to the deity and the purification of the worshiper. The water is taken from a basin with a ladle, a wish is made and the water is thrown on the statue, hoping for the wish to be fulfilled...
EXIF info:
Nikon Df
Lens: 24-70mm F/2.8G
Focal Length: 26mm
Aperture: F/5.6
Shutter Speed: 1/60s
ISO Sensitivity: ISO 1600