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> they dig a hole in the river

Maybe a silly question, but why did they dig a hole in the river? Wasn't there water there already, at that time?

Or maybe the river is dried up in the summer, and they dig a hole (dig? drilled?) to access water in the ground below?

> though apparently fish supersede their water rights

I'm curious about what your grandparents think about the water restrictions (if you happen to know, and if I may ask)

I assumed they meant that they dug a hole in the river to create a tunnel/pipe that conveys the water out of the river and into their irrigation system.

They could also have dug a hole adjacent the river to take advantge of the filtering properties of the soil (gravel, sand, clay or whatever it is along this river), reducing algae, contaminants and eliminating fish from the water for free.

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