The actual reason for immersing the idol is because long ago in time, when there was no environment on earth, except water all around, lord Brahma Vishnu and Mahesha, the creators of the world, chanted the holy word OM and they spotted a banyan leaf in the ocean on which a little child was floating.

Then they did aradhana to the small kid to create this world, later the child came to be known as Shree Ganesh.

So for the reason that he has been spotted in the ocean, we immerse the Ganpati idol in water, thinking he is returned back to his origin

," AVAHAN " aur "VISARJAN" yeh hinduaon ki pooja vidhi ka hissa hai. yeh Hindon kay jivan darshan ka hissa haii ki jo bhi yehan prithvi per aata hai usay ik din jana hi hoga,chahey vah insan ho ya Bhagwan

Phele ganpati sirf 1 1/2 day ke liye rakha jata tha nd mithi ka banaya jata tha mitti jab sukh jati h toh cracks pad jate hain so iske phele ki crarks pade use bahaya jata tha ye trend 5 days nd 11days ka toh baad mai bna ..........m sori agar galat ho bhagawn mai astha hai but jada ghyan nahi :((