I do not see a problem with it, they have gotten the permits and done everything according to process. If local protesters are so worried they should have purchased the land prior to Walther Farms.

Having said that, where do you think the irrigated water will go that is not absorbed by the potatoes? A fair bit will go to evaporation but all the runoff and what disperse into the ground will naturally make its way back into the river.

Careful not to curse a farmer with a full stomach!