We use about 410-billion gallons of water a day in the U.S.
(Photo courtesy of the US EPA)
Even as the population grows, the
US is using less water. Lester
Graham has the numbers from a new
report on water use from the US
Geological Survey:
Transcript
Even as the population grows, the
US is using less water. Lester
Graham has the numbers from a new
report on water use from the US
Geological Survey:
We use about 410-billion gallons of water a day in the U.S. But, water use per person is down. And, total water use for the nation is down about 5% from 1980 to 2005, the latest year covered by the report.
Susan Hutson is one of the authors of the Geological Survey report. She says there are a lot of factors affecting water use.
“Water conservation education, a public policy that supports that water conservation, and inovative technology, primarily in irrigation and the generation of thermo-electric power, the use of water for the cooling.”
There are still some problems. Some agricultural areas are using water faster than aquifers can be replenished. And, as we build more power plants -the biggest users of water – it will mean more demand in the future.
This is a private beach Charles Shabica developed for a homeowner on Chicago's North Shore. The grasses in the background are native to the area and help stabilize the beach and bluff. They also help trap and filter runoff. (Photo by Shawn Allee)
Another shot of the private beach. The designer describes it as a "miniature" bay. The curve protects the sand without sending a structure very far out into the water (compare to the steel structure that juts out farther). (Photo by Shawn Allee)
A common development pattern along Chicago's North Shore. These "groins" are there to hold the beaches in place. If there are too many, or they're not configured correctly, they block the natural flow of sand along the shoreline. (Photo by Shawn Allee)
One of the Ten Threats to the Great Lakes is changing how the shoreline interacts with
the lakes. Humans like to improve on nature. For example, we like to build things to
protect our property. Protecting a home from forces like wind, water and soil erosion can
be a tough job and expensive sometimes. But if your property is along the shore of a
Great Lake, it can be especially difficult. Reporter Shawn Allee looks at one engineer’s
effort to protect lakefront property and nature:
Transcript
We’ve been bringing you reports from the series ‘Ten Threats to the Great Lakes.’ Our
guide in the series is Lester Graham. He says the next report looks at protecting property
and protecting nature:
One of the Ten Threats to the Great Lakes is changing how the shoreline interacts with
the lakes. Humans like to improve on nature. For example, we like to build things to
protect our property. Protecting a home from forces like wind, water and soil erosion can
be a tough job and expensive sometimes. But if your property is along the shore of a
Great Lake, it can be especially difficult. Reporter Shawn Allee looks at one engineer’s
effort to protect lakefront property and nature:
Great Lakes shorelines naturally change over time. Beaches erode. Dunes shift.
Sometimes, even the rockiest bluffs collapse.
That’s OK for nature, but maybe not for a house sitting on top of it. So it’s no wonder
that landowners try to stabilize their shorelines. To do that, they sometimes build walls
of steel or concrete to block incoming waves. It’s a tricky process. If the walls are too
short, they won’t stop erosion. But if they’re too long, they trap sand that moves
naturally along the lakeshore.
When nearby beaches can’t get sand, they degrade into muddy or rocky messes.
Charles Shabica is a coastal engineer. He’s been working at the problem for decades
now.
“My dream is to see the shores of the Great Lakes ultimately stabilized, but in a good
way and not a bad way where you’re causing problems.”
Shabica takes me to a small private beach north of Chicago. He engineered it to keep the
shoreline intact. The keys to that are two piles of rock that jut out into the lake.
The piles are just the right size – big enough to protect the shore, but small enough to let
some sand pass by. There’re other elements to the design as well.
Tall, blue-green grasses line the beach’s perimeter.
“Not only do waves tend to move sand around, but wind is also really an important agent,
too. So the beach grass and dune grass tends to stabilize the sand. And what will happen
is, you can see these things are seeding now, wind will blow the seeds and pretty soon
you get that stuff growing all over the place.”
A lot of homeowners and city planners applaud Shabica’s work. But not everyone does.
Some environmental groups say, once a landowner builds a wall or rock formation,
others have to follow suit, just to preserve their own sandy shoreline.
The environmental groups’ alternative? Keep development farther away from shorelines
and allow more natural erosion.
But that hands-off approach is not likely to happen. The majority of Great Lakes
shoreline is privately owned. And in many states, landowners often prevail in court when
they try to protect their investments.
Keith Schneider of the Michigan Land Use Institute says the question isn’t whether to
build near the shore, but how to do it.
He says, in the past, landowners tried to get off cheap. They didn’t pay for quality
construction or get expert advice on local geological systems.
“If you don’t pay a lot of attention to these systems, it’s gonna cost you a lot of money.
And if you build inappropriate structures or inappropriate recreational facilities, you’re
going to either be paying a lot of money to sustain them or you’re gonna lose them.”
A lot of coastal geologists agree that, for much of the Great Lakes coast, private
shoreline protection efforts – even the bad ones – are here to stay.
In urban or suburban areas, housing developments near the shore often include a buffer or
wall.
Michael Chrzastowski is with Illinois’ Geological Survey. He says, in these cases, the
shore can look natural…
“But it’s going to be a managed, engineered facility, because wherever you are on the
shore, you’re influenced by some other construction or historical development along the
shore that’s altered the processes where you are.”
That’s definitely the case along highly-developed, urban coastlines, such as Illinois’.
Other parts of the region are catching up, though.
“What’s going to happen is, other places along the great lakes as they become more
developed and they become more urbanized, they’re going to use Illinois as a model.”
That could bring more projects like Charles Shabica’s little beach. Shabica says that’s
not necessarily a bad thing.
It’s just a way to come to terms with our presence along the lakes.
“Human beings are here to stay. It’s our responsibility I think to make our environment
better for us, but not at the expense of the biological community, and your neighbors.”
That sounds reasonable enough. But it will ultimately mean the vast, natural coastlines of
the Great Lakes will be engineered, one beach at a time.
Salt is an essential resource for all people, especially those who live in areas where the roads get icy. (Photo by Lucian Binder)
Ever wonder where road departments get the mountains of salt they use each winter? Here in the Midwest, the answer can be found deep under Lake Erie. The Great Lakes Radio Consortium’s Ann Murray has the
story:
Transcript
Ever wonder where road departments get the mountains of salt
they use each winter? Here in the Midwest, the
answer can be found deep under Lake Erie. The Great Lakes Radio
Consortium’s Ann Murray has the story:
Orvosh: “Step right in there.”
Murray: “Ok, thanks.”
For Don Orvosh, an elevator ride nearly 2000 feet underground is just part of the daily grind.
(sound of clanking)
“It’s about a four and a half minute ride to the bottom. 1800… about 1800 feet.”
Orvosh supervises the Cleveland salt mine owned by Cargill Corporation. It’s one of only eleven active salt mines in the country. The mine lies beneath the northern edge of Cleveland and extends about four miles under Lake Erie.
Orvosh: “Most people in the city don’t even realize there’s a mine right here.”
Murray: “Are you all the way down?”
Orvosh: “We’re at the bottom right now. This is it.”
(sound of opening air-lock door)
A few feet from the elevator, Orvosh walks through a series of air-locked metal doors. They rotate to reveal a subterranean repair shop. Massive dump trucks and cranes are fixed here. The cavernous room is also the starting point for hundreds of miles of tunnels. These tunnels connect a honeycomb of old and active areas in the mine. Everyday, 150 workers travel this salt encrusted labyrinth by truck or tram.
“We’re going to get in this little buggy here now and in a couple minutes we’ll be under the lake.”
Lake Erie is a geological newcomer compared to the salt buried below it. This bed – extending from upper New York to Michigan – was formed 410 million years ago. That’s when an ancient sea retreated and left behind its brine. Oil drillers accidentally discovered the deposit in the 1860’s. As Orvosh drives north through the dark passageways, he says salt wasn’t extracted here until many years later.
“This shaft was sunk in the late fifties and the actual mining of salt occurred, started in the early sixties so it’s been here 40 plus years.”
In the last four decades, the mining process has stayed pretty much the same. Orvosh compares it to the room and pillar method used in underground coal extraction. He points up ahead to a brightly lit chamber. Machine generated light bounces off the room’s briny, white walls. Its 20 foot high ceiling is bolstered by pillars of salt the size of double-wide trailers.
Orvosh: “This is an active production section. This is where we are mining salt.”
Murray: “What’s happening here?”
Orvosh: “He’s drilling the face here.”
A miner sits atop a machine with a large needle nosed drill. It bores six holes into the seam. Later in the day, workers will load explosives in the holes and blow out big chunks of salt. Farther into the mine, the loose salt from last night’s blasting is being scooped up by front-end loaders and dumped into a crusher. All of the big chunks are broken into small pieces. Then the salt is loaded on conveyor belts and sent to the mine’s three-story-high underground mill. Salt is crushed, sized, screened and sent to the surface by elevator.
All told, the crews at the Cleveland mine produce two million tons of salt a year. A sizable chunk of the 15 million tons of salt used on icy US roads each winter. Demand for road salt has skyrocketed since it was introduced as a de-icer in the early 1950s. But Robert Springer, a 27- year veteran at this operation, says each mine fights for a market share.
Springer: “It is a competitive market. There’s another salt mine just in the Cleveland area, out there in Morton, Morton Salt.”
Murray: “We needed you today. The roads were really icy. Do you look forward to icy days to keep production up?”
Springer: “I guess you could say we look forward to bad weather. We enjoy the bad weather because we know there’s going to be salt used.”
(sound of radio and weather report)
Back on the surface, Bob Springer has gotten his wish… Cleveland has just been hit with a winter storm. At least a dozen trucks swing through the mine’s loading dock to pick up tons of salt. Later in the day, salt will be dumped onto barges and transported across the Great Lakes to places like Chicago and Toronto. This is high season for road salt. The crews here know that come March, they’ll start rousing salt from its ancient bed for the winter of 2006.
For the Great Lakes Radio Consortium, this is Ann Murray.
We use about 410-billion gallons of water a day in the U.S. (Photo courtesy of the US EPA)
