Rural Sanitation Initiatives for Ganga Rejuvenation - are there any set guidelines?

Rural Sanitation Initiatives for Ganga Rejuvenation is a great initiative by "Namami Gange", but are there any set guidelines for Rural Sanitation? What should be the minimum distance for open defecation from the river bank (since open defecation is a popular practice)? Can open defecation be made safe for the environment in any way?  What is the best sanitation system Indian Villages can use without having to invest in Maintenance?