So much has the volume of water been lessened in the rivers of Nebraska, through the influence of geological causes, that there are few places where now, even in flood time, they overflow their banks.
(they; overflow; their banks; L:few places; T:now; T:even in flood time) (So much; has; the volume of water) Context(So much has,List([0, 11))):(the volume of water; been lessened; L:in the rivers of Nebraska)
So much has,List([0, 11))
they So much the volume of water
overflow has been lessened
their banks L:few places T:now T:even in flood time
the volume of water
L:in the rivers of Nebraska