Rainwater collection

[cj! 19]

In the electric propulsion thread it was suggested that collecting rainwater could be a worthwhile option to running a watermaker thus saving power. So I've done a little searching for ideas and this is what I've come across but I'd be keen to see what else others suggest. 

 

 

[wheels 543]

If we are expecting heavy rain for awhile, I have a little dam thing I place just behind the deck filler. I first of all, allow the rain to wash the deck, then place the dam and unscrew the filler cap. All the water from the foredeck runs down the side and into the filler.