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05-10-2019, 03:29 AM - 6 Likes   #1636
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Ottawa River flooding

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05-10-2019, 07:07 PM - 6 Likes   #1637
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More raging river
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05-10-2019, 10:44 PM - 1 Like   #1638
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QuoteOriginally posted by CharLac Quote
More raging river
The river looks terrifying, considering that every cubic metre of water has a mass of one tonne.

Philip
05-13-2019, 04:45 PM - 3 Likes   #1639
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Snow's melting, which means even small waterfalls look interesting. Hand held, nice to have SR for a bit of water blur (although the second image isn't perfectly sharp). k3ii and da 16-85 with polarizer




05-13-2019, 04:54 PM - 5 Likes   #1640
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Russell Falls at Mount Field National Park, Tasmania

Shot with the HD D FA*50/1.4 AW. Cross-posted from the 50mm Lens Club thread.


Last edited by RobA_Oz; 05-13-2019 at 07:31 PM.
05-13-2019, 06:17 PM - 1 Like   #1641
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QuoteOriginally posted by CharLac Quote
Ottawa River flooding
For people who build on flood plains, kind of poetic justice.

You can bribe city council to let you build, but you can't bribe the river.
05-14-2019, 02:44 AM - 1 Like   #1642
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QuoteOriginally posted by normhead Quote
For people who build on flood plains, kind of poetic justice.

You can bribe city council to let you build, but you can't bribe the river.

To be tiresome (getting better at it as I get older), what I used to point out to students in geology when discussing streams. There is a reason it is called a "flood plain." In fact, the flood plain is part of the channel of a stream, but the stream only uses when the discharge is uncommonly high. If there were a prolonged drought and a local stream went dry, would you sanction construction of houses in the dry stream bed? When you allow construction in a floodplain, that is precisely what you are doing.

05-14-2019, 04:52 AM   #1643
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QuoteOriginally posted by WPRESTO Quote
To be tiresome (getting better at it as I get older), what I used to point out to students in geology when discussing streams. There is a reason it is called a "flood plain." In fact, the flood plain is part of the channel of a stream, but the stream only uses when the discharge is uncommonly high. If there were a prolonged drought and a local stream went dry, would you sanction construction of houses in the dry stream bed? When you allow construction in a floodplain, that is precisely what you are doing.
A friend of mine explained this to me. I don't remember his argument exactly, but my take away message was that geologists define flood plane one way, but architects (?) and engineers (?) basically look at the recorded history and go from there. So if the place hasn't flooded in the last 50 years you are good to build there.

What's even more troubling is this. I remember listening to a woman who was was refused compensation for flooding in Alberta a couple of years ago because her house wasn't IN THE FLOOD PLANE. Only people in the flood plane got compensated for their stupidity.
05-14-2019, 07:55 AM - 3 Likes   #1644
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There was a long era during which the idea of American Progress, included the idea that we could control rivers. This included the building of most of the major dams, the channelizing of parts Missouri River, extensive levee building, and draining of flood plain wetlands for farming. The ideas that dammed reservoirs are destined to be filled by sediment (and in the process lose their flood protection capabilities), that upstream levees actually make downstream flooding worse, and that flood plain wetlands serve a variety of positive environmental purposes, have been learned painfully slowly.
05-14-2019, 08:10 AM - 9 Likes   #1645
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Some Yosemite waterfalls in springtime:


Illilouette Falls


Horsetail Fall


Bridalveil Fall


Yosemite Falls
05-14-2019, 08:43 AM - 4 Likes   #1646
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Some of the high water in Whitney, the Madawaska flows into the Ottawa River as feathered by Charlie Lac above... just in case you were wondering "where does all that water come from." A long way from all of it but some of it comes this way.




Last edited by normhead; 05-14-2019 at 06:22 PM.
05-14-2019, 03:41 PM   #1647
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QuoteOriginally posted by normhead Quote
A long way from all of it but some of it comes this way.
I was wondering how much of the flooding was related to development (specifically, the proliferation of impervious surfaces.) There's a strong correlation down here in megalopolis but it looks like the Ottowa River flooding was mostly just due to a whole lot of rain. Also snowmelt?
05-14-2019, 06:28 PM - 1 Like   #1648
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QuoteOriginally posted by dadipentak Quote
I was wondering how much of the flooding was related to development (specifically, the proliferation of impervious surfaces.) There's a strong correlation down here in megalopolis but it looks like the Ottowa River flooding was mostly just due to a whole lot of rain. Also snowmelt?
Where I live the soil is usually only a few inches deep, 6-8 at the most. It doesn't have a lot of retention capacity. This happens when we have heavy rain and heavy snow melt at the same time. We had no January of February thaws this year so everything that fell after November was still in the bush. 2013 was the same. But this kind of weather is expected to be more the norm in coming years. The guys Ministry of Transportation here have been doubling the capacity of every culvert in the province. Global Warming is already costing us a bundle.

Canada is already 14% of the way to a "hothouse" climate.
05-15-2019, 02:27 PM   #1649
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QuoteOriginally posted by normhead Quote
Where I live the soil is usually only a few inches deep, 6-8 at the most.
Ah, so the impervious surface is (just) underneath the topsoil.
05-15-2019, 02:28 PM   #1650
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QuoteOriginally posted by baro-nite Quote
Yosemite waterfalls in springtime:
Wonderful!
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