> Where does the water come from?
Out of the sky.
> What do they do each year to maintain those?
Rice growing is a religious affair for Vietnamese. The people in farming
communities, villages and outlying regions
do all the work partly by hand, draft animals and motor-driven tillage
machines. Sometimes harvest is done, on
large flat areas, with small ride-on rice harvesters.
> As permaculture folks, I suspect that we would want to say "not enough
trees", but ....
> where might one plant trees so that the tree roots don't compromise a berm
and let all
> the water out?
Forest gardens.
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