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poVoq@slrpnk.net

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Southern Germany hit by catastrophic flooding (www.dw.com)

submitted 5 months ago by poVoq@slrpnk.net to c/europe@feddit.de

19 comments fedilink hide all child comments

cross-posted from: https://lemmy.zip/post/16572873

The southern states of Bavaria and Baden-Württemberg have been inundated, causing dam bursts and prompting dramatic rescues. States of emergency have been declared in several areas with more heavy rain expected.

Archived version: https://archive.ph/bF7J7

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[–] Badeendje@lemmy.world 28 points 5 months ago (1 children)

Extreme drought makes the issue worse, when the surface is too dry it does not absorb water quickly, meaning you get more runoff. If feels counter intuitive, but it's true.

You might have noticed this when watering a completely dried out plant. The water stays on the surface of the soil longer.

[–] mranachi@aussie.zone 5 points 5 months ago

Not quite correct, if I remember correctly dry soil adsorbs more water and quicker (by default) than waterlogged soil. But when is been dry for a long time a hydrophobic film forms, causing a temporary delay in water adsorption. I think it can impact flash flooding, but it washes off fairly quickly and then adsorption returns to expected.