“A lot depends on percolation and soil mechanics. It could well cause buildings to collapse.”
IDK but isn’t most of that area composed of sandstone, the softest of stone? I know from past reading that at some point water soaked sandstone just starts to crumble.
Flooding the tunnels could make Gaza uninhabitable.
What's the downside?
I am pretty damn near certain of one thing: The IDF has consulted expert civil engineers who understand the geology and soil mechanics of the region far better than almost anyone, like yours truly, speculating on the internet.
But speculation is fun.
It looks like the primary rock type isn’t sandstone, it’s the harder conglomerate that they have lining the older tunnels with the masonry you see in images that have later cast concrete reinforcing, with the uniform arches that you see so much in the images. But they say they have destroyed 500 tunnels as of yesterday, and when they show them destroying tunnels on the news it is done by blowing them up.