Yair Halberstadt

Wiki Contributions


Ok, got it now. Still, is there any way of knowing how much that is? 10% of all the water evaporating from all the seas near the Sahara is still a huge amount of water. And if we do add more water, is there any way of knowing where it will rain down, as opposed to being spread over the entirety of the Sahara and ending up basically useless?

Or is this the sort of thing where you would have to invest huge amounts into infrastructure to do this, before you can tell what affect it will have?

Ok, so that's the important detail I missed. A small amount of extra moisture would cause all the existing moisture to rain down.

Do we have any way of knowing how much extra, or where?

But there's already tons of water evaporating from the sea alone the coast of Gaza. What would this make a difference?

So let's leave the dead sea alone and move on to the Persian gulf.

The Persian gulf is huge - some 250,000 square km, and extremely hot. It probably evaporates about a billion tons of water a day.

And yet it's completely surrounded by desert in every direction. Even Dubai, sandwich with sea to the west, north and east is as parched as it can get.

Despite all the water evaporating from the sea, there's still very little rain in the Arabian peninsula or in Iran. I don't know why that is precisely, but it seems to me that it breaks down the seemingly simple calculation: evaporate lots of water here, get rain further downwind.

It seems to me that simply evaporating lots of water would be very unlikely to achieve the changes you would actually want to.

So how much water would you need to evaporate per day, and from where to make the Arabian desert bloom?

About 2 million cubic meters of water evaporates from the dead sea every day, but the sea is surrounded by desert in every direction. The primary wind is to the east, yet to the east lies 500 km of Arabian desert. You would presumably need a lot more water than that to evaporate to change things.

Meanwhile the same amount of desalinated water would supply the domestic needs for 10 million people, or irrigate 400 square km of farmland.

Meanwhile to supply enough water to turn the Arabian desert to (still very parched) semi desert you would need to evaporate around a billion cubic metres every single day. You can't do that much better than this by focusing on a smaller region, since you can't decide where the rain will fall.

Sure if you move large enough quantities of water (for huge values of large) you might be able to make the desert bloom for cheaper than desalinating water. But that would still be many times more expensive than just supplying desalinated water to everyone who wants it.

I just don't really think this would work in practice.

I'm missing numbers here. How much water could you evaporate, compared to the amount of sea water that evaporates every day?

My guess is this would be (pun not intended) a drop in the ocean.

If one were superserious about time from call to ambulanced arrival you could have ambulances scattered separately across the town so that the mean distance from takeoff to accident scene is low no matter where it happens.

Hatzalah and Magen David Adam in Israel actually works this way. They have volunteer first responders throughout the populace, and whenever a call goes out they'll radio the nearest ones to get to the scene as soon as possible. First responders usually arrive within a matter of minutes - I personally know of at least 3 within a 5 minute walk of me.

Getting an ambulance to the scene for actually transporting the patient takes longer, as these are more centralised.

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