At this time of year not much, it's been a dryish summer, and there's not a lot of water coming down. Say half a knot - and that's probably an over-estimate. If you say that a freely-floating body - and the weights would help a bit there because they'd keep it under water and out of any wind - moves down on the ebb at an average of a bit under two knots you'd not be far wrong.
Select from options. Does this next sentence follow, given the preceding text?
a freely-floating body moves down on the ebb at an average of a bit under two knots

Choose from:
 A). Yes
 B). No
 C). It's impossible to say
A).