How does a Passive House handle floods?

That’s more of a durability issue thanwall performance. Some Passive Houses may do fine, others may be severely damaged. You could get a homePassive House certified(PH) with abasementthat has poor drainage and nosump pumpand find your basement ruined by a minor flood, but if you built a slab on grade house a foot above the surrounding ground you could canoe away from your front door in a flood with no damage whatsoever.

If you are in the design phase and concerned about durability, I would look into building a slab instead of a basement as it virtually eliminates your risk of flooding, but if you’re building a basement I would install a sump pump with a battery backup, a drain around the exterior, eaves troughs that take water far from the house and slope the land away from thefoundation. And be sure to raise any wood flooring above the surface of the concrete.

As for appliance leaks, there are a couple of easy steps you can take to prevent damage – place washing machines and water heaters on a tray with a drain and have easy shut off valves installed, or include a
floor drain in your laundry or mechanical room (See photos below).

透气性在洪水中根本不是问题，在一场大的地下室洪水之后，你可能需要相当长的干燥期，你需要大量的通风和除湿，这远远超过一个漏风的房子所能处理的。
LEED评级系统更多的是关于耐久性的衡量，而不是PH值，所以如果你想要建造一个房子，并想要一个性能认证，这可能是更好的选择。如果您愿意，该设计和施工仍然可以满足PH效率水平，但它也要确保由独立的第三方对其耐久性措施进行检查。
Hope that helps, here are a few reference pages that you may want to check out:

• Stormwater management
• Slab on grade
• LEED durability
• Sewage backup prevention

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