Auckland Weather 27/01/23 and Cyclone Gabrielle

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#3074615 10-May-2023 17:38

Benoire:
The entire system is built on the concept of a 10% AEP service level, i.e. the surface drainage system can cope with what was considered standard level events but there was always a 10% chance that a storm event could overwhelm the system.

Friend of mine was joking with some other guys that he was helping unblock drains in flooded streets that he must be several hundred years old because he's experienced multiple one-in-a-hundred events...

(And yes, I know how AEP works, and so does he).

neb

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#3074617 10-May-2023 17:40

elpenguino:
Come to Wellington and pay > $4k for an average house in an average suburb.

Of course it never floods here ..... but that's probably because we're at ~100 mtrs elevation.

At the moment anyway. Just wait till the next quake hits :-).

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#3074649 10-May-2023 18:14

neb:
elpenguino:

Come to Wellington and pay > $4k for an average house in an average suburb.

Of course it never floods here ..... but that's probably because we're at ~100 mtrs elevation.

At the moment anyway. Just wait till the next quake hits :-).

prices doubled after the last quake

Benoire

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#3074655 10-May-2023 18:29

neb:

Friend of mine was joking with some other guys that he was helping unblock drains in flooded streets that he must be several hundred years old because he's experienced multiple one-in-a-hundred events... (And yes, I know how AEP works, and so does he).

Yep I get that, but what is more important is that these rare events are happening more frequently with a greater intesity of rainfall than previously tracked... as the air continues to warm, it can hold more water and therefore carries more volume over land before releasing it.

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#3074658 10-May-2023 18:34

Benoire:
as the air continues to warm, it can hold more water and therefore carries more volume over land before releasing it.

Funny thing I noticed earlier on as it got dark, the whole house is surrounded by the sort of high-pitched chirping noises you usually hear in the tropics, not obviously crickets but something else.

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#3074662 10-May-2023 18:40

johno1234:

They're not the best at transporting away the poos and wees but.

The council is good at taking away the poos and wees. It's just the delivery to the right place where they sometimes get it badly wrong.

Most of the posters in this thread are just like chimpanzees on MDMA, full of feelings of bonhomie, joy, and optimism. Fred99 8/4/21

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elpenguino

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#3074664 10-May-2023 18:42

neb:
elpenguino:

Come to Wellington and pay > $4k for an average house in an average suburb.

Of course it never floods here ..... but that's probably because we're at ~100 mtrs elevation.

At the moment anyway. Just wait till the next quake hits :-).

People have been threatening Wellington with the big one every since I moved here. In the meantime I've seen quakes hit Gisborne, Kaikoura and Christchurch with many other places either under water or burnt to a crisp.

Maybe Brian Tamaki is right ? /s

Most of the posters in this thread are just like chimpanzees on MDMA, full of feelings of bonhomie, joy, and optimism. Fred99 8/4/21

Reanalyse

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#3074788 10-May-2023 20:54

And now (8:50 pm Wednesday) we have thunder, lightning and hail in West Auckland.

And I thought it was all over.

Sigh...

neb

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#3074794 10-May-2023 21:20

There was a very nearby strike at exactly 9pm that set off the motion sensors on the Timms traps, and shook the whole house in the process. They had been expecting thunderstorms, and the downpour was relatively brief.

Edited to add: Just noticed that the radio-based sensors all have a gap at 9pm lasting a few minutes, that must have been quite some EMP:

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#3074843 10-May-2023 22:53

neb: Funny thing I noticed earlier on as it got dark, the whole house is surrounded by the sort of high-pitched chirping noises you usually hear in the tropics, not obviously crickets but something else.

cicadas

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#3077118 17-May-2023 13:16

neb: There was a very nearby strike at exactly 9pm that set off the motion sensors on the Timms traps, and shook the whole house in the process. They had been expecting thunderstorms, and the downpour was relatively brief.

Found out where it was, it took out a tree maybe 30m away. I'd seen half the tree lying on the ground but didn't realise it was lightning that brought it down.

Edited to add: And here's the tree, or at least the lower half of it.

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#3082970 31-May-2023 19:18

To add to my earlier post about the insane location of the grid exit point for the lower half of Auckland's North Shore, here's a photo of it:

This is after around two weeks of fairly nice weather. The entire water runoff of the Wairau Valley runs along the open drain at the front of the photo. This is what happens when there's heavy rain:

The location where the first photo was taken is underwater in the second one.

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#3083021 31-May-2023 20:06

neb: To add to my earlier post about the insane location of the grid exit point for the lower half of Auckland's North Shore. The entire water runoff of the Wairau Valley runs along the open drain at the front of the photo. This is what happens when there's heavy rain: The location where the first photo was taken is underwater in the second one.

I was near there for work recently and was discussing that piece of infrastructure. Apparently everything inside is elevated as well. The person I spoke to said it wasn't the water in culvert coming up, which is where I assumed the water came from, but it was pouring off the elevated motorway and there was simply too much of it.

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#3083024 31-May-2023 20:15

neb:
This is after around two weeks of fairly nice weather. The entire water runoff of the Wairau Valley runs along the open drain at the front of the photo.
The location where the first photo was taken is underwater in the second one.

While I agree it’s probably not an ideal site, I do feel this is slightly unfair. Your “after heavy rain” photo is after the heaviest rain we’ve had….ever. By a huge margin. And while it was indeed flooded, it didn’t fail. I live around the corner and didn’t lose power at all. So it seems like it could’ve gone a lot worse.

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#3083025 31-May-2023 20:21

mkissin: While I agree it’s probably not an ideal site, I do feel this is slightly unfair. Your “after heavy rain” photo is after the heaviest rain we’ve had….ever. By a huge margin. And while it was indeed flooded, it didn’t fail.

If you read the Transpower report, it came within a hair's breadth of flooding/failing.

The site actually flooded while they were building the substation. They waited for the flooding to go down, then continued building a piece of critical infrastructure at the location that had just flooded.

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