The River Ganga was man-made

I remember once, some years ago, my pen friend from NJ, wrote asking- Ganges is a sacred river to the Hindu religion, then why does it stand so polluted? I could only chuckle sadly with two thoughts,... one: what is dear to you, you often tend to over-do it....this happens from lack of awareness. second: most people don't know about the effort that went into channelizing the mighty river, ages ago! Read this for more.