Winter Cover Supports
I have a full winter cover for my boat. The high point is at the helmsman seat on the upper deck and from there it slopes down to the rear rail and then down to a cinching strap at the level of the swim grid.
The problem is right at the rear rail. The fabric sags a bit, the water collects a bit, which cause it to sag some more, so it collects more water etc. It very quickly collects a huge amount of water, probably approaching 100 lbs. (Say the equivalent of a 20 liter pail on each side which would be 88 lbs.)
To overcome this problem I made some pads of 1/2″ Starboard, a marine plastic. On the underside of the pads I attached plastic donuts of a thicker material, the supporting rods would go into these donuts. The donut holes were made larger than the supporting rods so the Starboard pads could pivot and take the slope of the cover.
The bases were welded and screwed to pieces of plywood. Under the plywood I put some expanded rubber, the type that is used on boats to keep the plates from sliding off the table. However even this was not enough to keep them from sliding, and thus the upright supports had to be tied in place so the cover would drain properly.
Problem solved. No more ponding water.