No water in borewell


I had installed 600 ft borewell at my residence in 2010. Now there is no water coming from the past one week. What is the issue, i do not know ? 3 years back there was no house in BDA layout. Recently 4 houses have come  next my house and every body has installed borewell.

Please can any body help me as what is the issue and how to resolve it.

Regards Sheshadri