It is inappropriate to immerse Shri Ganapati Idols in provisional tanks because after immersion of Idols in man-made tanks, associated workers remove the Idols even before they dissolve in water.
Uttarpooja should be performed before immersing the Shri Ganapati Idol in flowing water. After performing this puja, the Idol is slightly shifted from its place. After the uttarpuja, the Idol is immersed in flowing water.
If the idol of Shri Ganesh is sculpted as per the science behind the idol then the pure spiritual particles of Shri Ganesh get attracted towards the idol to a greater extent and those worshipping it are benefited.
By immersing the idol in flowing water the Ganesh Principle in the idol also flows and spreads far and wide. With the evaporation of the water charged with the Ganesh Principle, the entire environment also becomes sattvik.
