Funny, I just read this from my Botswana safari book: is there any alegator? No, only crocodile. That is when the safari jeep stuck in the river. Your photo makes me wonder.
It looks like it would not get done any other way with manual labour. We have similar "contraptions" here but much larger that pull up mill foil weeds in lakes. Great capture of the work involved.
It's an interesting contraption. What happens to the reeds that are pulled out by the "fork"? Does this machine also scoop them up or is another machine needed for that job?