Long story short youu have 0 scans to prove Kumo has rivers and lakes you know up in the clouds. Outside the perimeter there are plenty in fact bee fight Sasuke near a lake but not in the village.Yeah the village's founders were dumb to not create a village near a source of water especially when that village happens to be above normal ground. Yup would make perfect sense only to retards.
Anyway, as you yourself have been claiming please correct me if I am wrong, that they'd only erect a barrier around Hinata and not around the whole village, its pointless to argue about Jiraiya needing any river or lake to infiltrate the village as his technique already could penetrate a detection type barrier.
As for Jiraiya going invisible and the barrier fanfic, Jiraiya does posses an invisibility jutsu but I am not sure whether it conceals his chakra as well or not so I didn't bring that up. Now for the defensive barriers, how many defensive barriers have you seen in the manga that would fit inside a building? And how many from Kumo nin?
As for Jiraiya getting caught then you've simply failed to provide a satisfactory explanation about how he gets caught. So I am not resorting to personal attacks but simply stating my observation based on this long and fruitful conversation we had....:lol
Jiraiya gets caught by sensors it's that easy and those people guarding Hinata have eyes. Jiraiya doesn't miraculously make his way up to the top of the mountain in a toad which would definitely be out of place in the clouds especially in the most secure part. If you can't fathom that then I have no answer talk satisfy you. I too enjoyed our fruitful conversation and I hope I haven't attacked you on a personal level.