Nah! Happily grow in 30f temps so no problem in Brissy.Quote:
Originally Posted by RANDLOVER
Bloody things are everywhere down here too.
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Nah! Happily grow in 30f temps so no problem in Brissy.Quote:
Originally Posted by RANDLOVER
Bloody things are everywhere down here too.
Hope some things are wrong. Evidence suggests otherwise saddly
In China, 1 million people are at risk from glacier-melt flooding, a disaster threat set to grow with global warming
- Glacial lake outburst floods – or GLOFs – threaten 15 million people around the world, including vulnerable populations in western China
- New Zealand academic says governments could encourage residents to move from the danger zone, while reserving high-risk areas for agriculture only
In China, 1 million people are at risk from glacier-melt flooding, a disaster threat set to grow with global warming | South China Morning Post
Ice Melts is a known know
"The global study by researchers in Britain and New Zealand found that across the world, 15 million people who live within 50km (31 miles) of a glacial lake could be under threat from floods, a risk that will grow amid changes to the climate."
Not a issue in OZ of course. No Australian Glaciers, NZ has a few of course. Very beautiful in my recollection.
glad to hear some are less in trouble with drought. "LOS ANGELES (AP) — Tremendous rains and snowfall since late last year have freed half of California from drought, but low groundwater levels remain a persistent problem, U.S. Drought Monitor data showed Thursday.
The latest survey found that moderate or severe drought covers about 49% of the state, nearly 17% of the state is free of drought or a condition described as abnormally dry. The remainder is still abnormally dry." Half Of California Freed From Drought Thanks To Rain, Snow | HuffPost Latest News
February has been kind[thumbsupbig]
"In 1963, humans stopped time, when the brand new Glen Canyon Dam on the Utah-Arizona border cut off the reddish sediment that naturally eroded the Grand Canyon. Today the river runs vodka clear from the base of the dam.
But the silt never ceased arriving in Lake Powell, the reservoir above the dam. Each day on average for the past 60 years, the equivalent of 61 supersize Mississippi River barge-loads of sand and mud have been deposited there. The total accumulation would bury the length of Manhattan to a depth of 126 feet — close to the height of a 12-story building.
"
Thats a lot of mud. Interesting as during a Drought in Vic 1982-1983 our dam went dry- Besides a LOT of fish yabbies and a huge red gold fish that had become FishZilla[bigrolf] . The Old Cocky whose family had dug the dam looked as was shocked it was less than 1/2 the depth it was when he saw it before any water was in it. He had a picture.
A little digging later 40 odd tonnes of silt and stuff was removed - case of beer for the road work grader driver I think[bigwhistle][bigwhistle][bigwhistle]
Back the the MUD
" Colorado have drawn the reservoir down to record lows, the silt is exposed — forming “mud glaciers.” And because of a gradient created when the lake level falls, the giant mud blobs are moving at a rate of 100 feet or more per day toward the dam."
I had not thought of that myself-
"These advancing mud blobs pose existential threats to the water supply of the Southwest: One day they could form a constipating plug that blocks Glen Canyon, preventing the water from flowing downriver. They could also someday endanger the structural integrity of the dam."
Electricity now!
"Lake Mead would start filling up with sediment, eventually becoming useless, with mud eventually replacing all the water behind Hoover Dam."
Very interesting to alarming for some I assume!
Dale Maharidge: The Colorado River is running dry, but nobody wants to talk about the mud
Sediment buildup is a well known problem with ant dam. An interesting book I have on the history of dams has a picture of an ancient Roman dam in spain - the dam is filled to the top of the wall, and the stream has cut a new channel through this flat land and down through the dam wall almost to the base of the dam. The surrounding flat is used as a successful orchard!
Many dams are set up with a floodgate near the bottom which can be opened periodically to flush the mud downstream.
Kinda like these...
See What Happens A Huge Dam Is Opened After Years - YouTube
and from a different angle
Look What Happens When a Huge Dam Is Opened ! #3 | Dam Water Release | Pressure - YouTube
another one...
Look What Happens When a Huge Dam Is Opened ! | Dam Water Release | Pressure |Dam Waterfall - YouTube
Hi,
I think beaver dams eventually silt up to form beaver meadows. Similar may happen with modern concrete dams with out planning. The potential energy stored in the mud could be scary!
Cheers
Lots of rain and snow- 20 bad and 1 good = still crook
https://www.youtube.com/watch?v=XKupKoci1_Y
Tooroorong Reservoir, just north of Whittlesea, is actually the silt trap for Yan Yean.Quote:
Originally Posted by NavyDiver
In the closed catchment there are miles and miles of cut stone channels from all the off takes.
The whole system is quite remarkable, dating back to the 1880's.
Also of note is the off take on Wallaby Ck which directs water south into this system.
Wallaby Ck naturally flows around a spur after this off take, into King Parrot Ck which ends up in the Goulburn, which ends up in the Murray.
So Melbourne has been 'stealing' water from north of the divide long before the N/S pipeline.
DL
"CORCORAN, Calif. — It is no secret to locals that the heart of California’s Central Valley was once the largest body of fresh water west of the Mississippi River, dammed and drained into an empire of farms by the mid-20th century.
Still, even longtime residents have been staggered this year by the brute swiftness with which Tulare Lake has resurfaced: In less than three weeks, a parched expanse of 30 square miles has been transformed by furious storms into a vast and rising sea.
The lake’s rebirth has become a slow-motion disaster for farmers and residents in Kings County, home to 152,000 residents and a $2 billion agricultural industry that sends cotton, tomatoes, safflower, pistachios, milk and more around the planet. The wider and deeper Tulare Lake gets, the greater the risk that entire harvests will be lost, homes will be submerged and businesses will go under.
..Across the region, the surprise barrage of atmospheric rivers that swept through California over the past three months already has saturated the ground, overflowed canals and burst through levees. The fear now is that record walls of snow in the southern Sierra Nevada will liquefy in the intensifying spring heat into a downhill torrent that will inundate the Central Valley.
"
A Farmer tying to patch a whole in a levy used his PICK UP Truck filled with dirt!
Novel!!!! A front end loader might have be better? The rains was well below the Dams and Colorado River
Got a bit windy in some parts of the Mid USA! sadly a lot of people died