Cleaning Ganga without cleaning Yamuna makes no sense, Yamuna dumps all the waste it collects in it's way into Ganga at Allahabad. The city that is responsible for polluting both Yamuna & Ganga most, is Delhi and the industrial areas that surround it. It makes sense to start the cleaning from Delhi and industrial areas surrounding Delhi.

the main problems are industrial waste, sewage waste and garbage waste..

Here is a note that you may find useful.

I think one of the biggest challenge is the religious sentiments. If I want to offer my prayer to Ganga, I would buy some flower and just let if flow in water, never thinking on what happens afterwards, what if only one flower dropped in the river. If govt tries to take some measures then it hurts my so called religious sentiments. In all this I forget that I have also contributed in damaging the pride of Ganga. Isn't this an "ill sentiment". Mere understanding solves half of the problem.

rivers are dumping ground of the waste of city and industries..solution is one..a waste treatment plant located just outside the city where all city dump will go and get recycled..similarly industrial waste treatment plants need to be set up..when the city will be clean rivers will be automatically clean

after 100 steps place a garbage box
help all the members of our society
use the method of Gandhi giri throw all the garbage in dustbin start with one after few days there are 10 more to help and same way one day all the people of our society help each other.
try put your efforts no one is asking money for trying

after every 100 steps there should be one garbage point
please help the unaware people of our society (children-aged people) use the method of Gandhi giri
and not only the Ganga but all the water bodies

8. Movies and TV serials that are shooted over Ganga to get a rebate on entertainment tax to generate revenue for the project. Construct an infrastructure for movie making so that even international movie makers can come here.
9. Special tourist trains from major cities to increase tourism.
10. Convert a few airport to International status to attract direct international tourism

1. Provide alternate drainages for Industrial/Domestic waste so that it doesn't mix with Ganga.
2. Channelize the waste into a Reservoirs away from population.
3. Treat the waste.
4. Treated water channelized to industrial/domestic use or into canals for irrigation.
5. All industries contributing to fund the project to get Carbon Credit.
6. Ganga declared a national park and only small fishing boats allowed to preserve flora/fauna.
7. LTC to govt employees to increase tourism revenue.

1. Provide alternate drainages for Industrial/Domestic waste so that it doesn't mix with Ganga.
2. Channelize the waste into a Reservoirs away from population.
3. Treat the waste.
4. Treated water channelized to industrial/domestic use or into canals for irrigation.
5. All industries contributing to fund the project to get Carbon Credit.
6. Ganga declared a national park and only small fishing boats allowed to preserve flora/fauna.
7. LTC to govt employees to increase tourism revenue.