Help us Design a Blue School Concept Curriculum

We are planning to organize courses about the environment and water sustainability for school children at the Regional Environmental Center, where I work. The idea is to educate the children to protect the environment from young age. We wanted to implement the “blue school concept” and we are currently making a program for the course. Blue school concept is an education model which combines elements of other approaches and unique elements of its own and has water as central theme. Has anyone had experience with such water programs at community level? Which approach and methods do you propose? Is there a concept based on PRA or something similar?  Please share your experience of conducting and designing similar courses for children and the technical approach you took.