Recent comments in /f/UpliftingNews

Dynasuarez-Wrecks t1_j48x0ym wrote

I was going to go to Sequoia National Park on Monday, but the flooding and storm warnings changed my mind. Not to mention, I live in a direction that I access the park by the south entrance through a town called Three Rivers, and a landslide has demolished at least one road there.

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ghoulthebraineater t1_j48uuik wrote

Yep. Water likes to stick to water. If the ground has some moisture already the water is more than happy to go into the ground with all of its other water molecule buddies. If the ground is completely dry it takes more time so it will either pool up or just keep flowing.

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ghoulthebraineater t1_j48u80s wrote

That just isn't practical. One of the big problems with dry ground is water likes to stick to other water molecules. They will work their way into the dry soil but it takes more time. A good example is comparing how much more and how much more quickly a slightly damp sponge will absorb water versus a completely dry one. If you were to pour water on both you'll see that most of the water will just run off the dry sponge.

If were to drill out a few holes in the dry sponge it's not going to really change much. The hole itself might become a small reservoir but it won't change the rate of absorption.

This would scale really poorly in the real world. You'd need so many holes drilled all over the place. It would be incredibly expensive and logistically impossible not to mention insanely dangerous. Having tens of thousands of open wells isn't a great idea.

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medoy t1_j48s92i wrote

Most of California's water consumption is from agriculture. A couple personal catchment systems would make little difference.

Its hard to understand until you've lived here how its like the Atacama desert for much of the year and then only modestly rainy for a couple months most years.

Many months are not "very little rainfall" but basically zero rainfall.

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bermudaphil t1_j48r7m8 wrote

Well, if the water is pulled from reservoirs that are unlikely to get filled during those 5 months when people would be primarily being using water they collected from rainfall, then it seems like it would have some positive impact.

This is from the point of view of someone who lives in a country where every. single. house. is constructed with roofs that catch, purify and store water for usage. Not a third-world country, a quite wealthy one.

During the summer people do have to purchase water during the few months with very little rainfall, but it isn't as if those months where we get to have full tanks due to rainfall, and get to have that water not be bogged down by chemicals, are having no positive impact. Quite the opposite, in fact.

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bermudaphil t1_j48qd60 wrote

Anyone who lives somewhere hot where it can go lengthy periods without rain, even if it is just a seasonal thing, should understand why this rainfall isn't going to solve the draught, even if the sheer amount of water that fell theoretically could have in a basic model that doesn't account for what happens during a lengthy period without rain.

Even just a few months here without rain and the ground is so hard, it becomes more like hardened clay than soil or dirt, and the rain doesn't seep into it quickly, meaning any winds, slopes, etc. make it just roll/flow away before it saturates the soil.

It takes times for the soil to become pliable and accept rain, and I don't know the actual science about it but I sure know that when it gets dry in the summer here, the first heavy rains don't feel like they've done much for how much rain there was, and it seems like all they've done is fill up pools.

By the time it has rained a few times and the ground gets more receptive to absorbing water, the rains definitely have a notably different impact.

That is after 1-4months of fairly dry weather, and I live somewhere with exceptionally high humidity. California has had many, many years of draughts far more extreme and very little humidity, so it is going to take far more than just a few torrential rains before they get anywhere close to being out of a draught. You can't expect the reversal of many years of something extreme to occur within just a short period of the opposite, at least not in most situations.

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