Water is now flowing into our tank! The crew was successful at cleaning out the gunk and debris which was clogging the water intake from the river. They came home, only to find that water was still not flowing into our tank. So they went back out again, and discovered that the increased water pressure had blown a connection in the water lines. (We share this water system with a neighbor, who apparently doesn't see the wisdom of gluing the connections. This is about the fourth or fifth time we've had to repair his part of the system because of lack of glue.) Once this was repaired our tank started filling.
Currently our water is dark and scummy, because the yuckiness which settles to the bottom of the tank was being sucked into the house, but soon we should be back to "normal" around here!