Evaporative cooling is less effective in the tropics due to the high humidity, so spraying water may have limited effectiveness. It may be fine in the south of France though.
Common language problems again. In UK, the term Houseboat tends to refer to a craft on a permanent mooring (many of them could never move away) so we're talking about a different creature.See #8 and #13.
In the USA West, most houseboats are under way or at anchor when occupied. Not at a dock or a mooring. You have many choices where to anchor. But 7 meters down is a sink of cool water.
I don't think that photo was a serious 'mooring suggestion' aamof. It looks more like a place for white water rafting than somewhere to spend the night.(Also, since that appears to be a flowing river, anchor swing be reduced to a few degrees of "hunting".)
Scrubbing the deck can be a pain at the best of times. I think you'd need more of a jet wash than a sprinkler if you wanted to have a non-slippery deck. Algae would get into any ropes out there and into joins between timbers and fittings - they have all day to work on that, just like weeds in the garden.The problem I see with water spraying is, that you should expect a lot of algae. Especially if the water 'cleanness' is limited.
Yep. Too many undisclosed variables and an unfamiliar topic. It's even worse than trying to discuss house wiring. It does give a nice insight into the various experiences different members have had, though and gives us practice with new vocabulary.We should stop this thread because of the many mental models of the circumstances of the posters.