I'm not an expert or anything and the essay outline looks commendable but I would just like to add a few points.
1-You've mentioned water wastage several times but you haven't elaborated how.
2- A little insight into the history of the water dispute with India as well as the ongoing debate over water sharing between provinces.
3- Besides the wastage of water there are several other reasons for water scarcity including explosive population growth and climate change.
4- I think a seperate heading for agricultural water wastage and as well as one for how to overcome it, wouldn't be a bad idea.