Tag: hydrology

Mapping Underground Rivers

  • DNR hydrologist Jeff Green consults a high-resolution topographic map to figure out which sinkhole is ahead of him. The trees and grass that grow up around the sinkhole form a buffer, allowing water to soak into the soil and filtering any pollutants before it reaches the aquifer.(Photo courtesy of Stephanie Hemphill)

Spring in the north is a time of melting snow and running water. It’s the best time of year for people who study underground water flows. Those underground rivers are important, especially where surface water easily drains into bedrock. It can quickly carry pollution long distances. Hydrologists try to map these underground rivers to help protect fragile ecosystems. As Stephanie Hemphill reports, the first step in making these maps is a process called dye tracing.

Transcript

Spring in the north is a time of melting snow and running water. It’s the best time of year for people who study underground water flows. Those underground rivers are important, especially where surface water easily drains into bedrock. It can quickly carry pollution long distances. Hydrologists try to map these underground rivers to help protect fragile ecosystems. As Stephanie Hemphill reports, the first step in making these maps is a process called dye tracing.

When the snow is melting in the woods and fields, Jeff Green wants to know where it’s going.

“We’re going to hike back to two springs.”

Green is a hydrologist with the Minnesota Department of Natural Resources, and an expert in the limestone geology of Southeast Minnesota.

Green climbs a fence and splashes through a stream that’s flooding a pasture. The stream is bordered by a natural wall of limestone.

Melting snow seeps into the limestone. It runs down vertical cracks to bigger horizontal openings that look like miniature caves. Jeff Green calls these “conduits,” and some are three inches wide.

“You can imagine a pipe that big — water would move very fast, like we’re seeing. So these conduits are what we’re dye tracing.”

Green has traipsed out to this pasture to put what he calls a “bug” in a spring. The ‘bug’ is a small mesh bag about the size of a cellphone, packed with charcoal. The charcoal will capture a dye that he’ll pour into melting snow in a sinkhole a few miles away. He’ll do this in several different spots.

By tracing the paths of different colors of dye, he’ll learn the sources of the water that feeds each spring. That will help him make what he calls a springshed map.

We slog across a corn field that’s dotted with small groves of trees. They’re growing around miniature canyons, about 20 feet deep. Here, you can see how this honeycombed water highway works, and this is where Jeff Green will pour the first dye.

“This is a place where there was a conduit, an opening in the limestone.”

Green climbs down carefully into the crevasse.

“Listen! … All right!”

He’s found some running water.

“Water’s running right here. I don’t know where it’s going but it’s going someplace. So I’m going to try pouring dye here.”

He pours a cup or so of a bright red fluorescent dye into the snow.

Green marks the spot with a GPS unit. This is a place where surface water and groundwater meet.

“That snow-melt is surface water, it’s going into this sinkhole and it’s becoming groundwater as you’re listening to it.”

That means what happens here on the land directly affects the quality of the groundwater.

“In this case, it’s pretty good, you’ve got conservation tillage, lots of corn stalks left to keep the soil from eroding, and then you’ve got grass, permanent cover, around the sinkholes. So this is actually really good.”

There are wonderful trout streams around here. The map Green is making will help protect those streams by pinpointing the source of the water that feeds them.

In a day or two, Green will check the “bugs” he put in the springs, and find out exactly where the dye from this sinkhole went.

He usually finds water traveling one-to-three miles underground before it surfaces.

When the springshed map is finished, he’ll share it with local governments, farmers, and people who want to protect the water in this landscape.

For The Environment Report, I’m Stephanie Hemphill.

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Mining vs. Old-Growth Forest

  • Dysart Woods in southeast Ohio is an old-growth forest. Many of the trees are more than 300 years old. (Photo courtesy of dysartwoods.org)

The need for cheap energy is coming into conflict
with efforts to preserve a forest. Coal mining companies are using a technique that causes the land to subside and sometimes changes natural underground water systems. Environmentalists say mining underneath a forest preserve could destroy the ecosystem. The Great Lakes Radio Consortium’s Lisa Ann Pinkerton reports on environmental activists who are defending the
forest:

Transcript

The need for cheap energy is coming into conflict with efforts to preserve a forest.
Coal mining companies are using a technique that causes the land to subside and sometimes
change natural underground water systems. Environmentalists say mining underneath a forest
preserve could destroy the ecosystem. The Great Lakes Radio Consortium’s Lisa Ann Pinkerton
reports on environmental activists who are defending the forest:


For decades, the coal mining industry has been using a technique of extraction called
long wall mining. Industry officials say it’s the most effective way to get the bituminous
coal out of the ground. In traditional room and pillar mining, the land above is not disturbed.
But the long wall machine leaves no support for the 1000-foot tunnel created in its wake. After
the coal is extracted, the ground caves in, causing the land to sink.


Dysart Woods, in southeastern Ohio, is slated for such a fate. The conservation group,
Buckeye Forest Council, wants to block the woods from mining. Its members believe long
wall mining will destroy the old-growth forest. The four hundred and fifty acres, fifty-five
acres of the trees are more than 300 years old. Fred Gittis is an attorney who has volunteered
his services to protect the woods.


“And these woods are precious, and they are among the last old-growth forest areas remaining,
not only in Ohio, but in this part of the country. Recently a documentary was filmed in Dysart Woods, because it has some of the conditions that would have existed at the time of George
Washington’s life.”


Gittis argues state should repeal the mining permit granted for Dysart Woods. Ohio Valley
Coal was granted the permit in 2001. As steward of the woods, Ohio University disputed the
permit for three years. But last November, it agreed to drop its appeal, in exchange for $10,000 from the state to study the forest’s water, as it is undermined. Ohio Valley
Coal Company would drill the wells needed. But the Buckeye Forest Council says a study doesn’t
solve the problem.


“First of all it is just a water monitoring project. It offers no protection to the woods.
Second of all, they don’t have the base line data right now to compare to what it normal.”


That’s Susan Heikler, Executive Director of the Buckeye Forest Council. When Ohio University
accepted the mining permit, her organization took up the fight. The group worked with lawyer
Fred Gittis and nationally known experts to review the science of the Coal Company’s mining
plan. Gittis says the Council’s experts were not impressed.


And, both hydrogeologists and mining experts have indicated that the basic science related
to this mining permit is, not to be insulting but, junk.”


The plan calls for long wall mining within 300 feet of the old-growth forest. However,
experts from the Buckeye Forest Council say a 1500 foot buffer around the woods
is the only way to insure the protection of the hydrology – the natural water system that
sustains the forest.


In a major concession two years ago, the Coal Company agreed not to long wall mine directly
under Dysart Woods. Instead, room and pillar mining is planned. The Company says that will
delay subsidence for centuries to come. Attorney Fred Gittis says without core samples from
directly under the woods, the company doesn’t have the data to back up this claim.


“If you don’t know what that rock is, if it’s soft like claystone or shale, it can collapse.
And so its pretty basic stuff.”


Attorneys for the company declined to be interviewed for this story. In statements, the
Company defends its lack of data by pointing to exemptions they were granted by the Department
of Mineral Resources. The Company stands by its assertion that, quote, “trees and other surface
vegetation will absolutely not be affected by mining.” But in September, the story changed. In
court, a mining consultant for the company, Hanjie Chen, testified that the forest floor would
sink 5 inches. Attorneys for Ohio Valley Coal abruptly stopped his testimony after this
statement. But Gittis says the damage to the coal company’s case is already done.


Although Buckeye Forest Council rested its case in July, the defendant, Ohio Valley Coal is
still adding witnesses and dragging out the case. Fred Gittis says the Company is trying to
exhaust the Buckeye Forest Council’s legal funding. He adds that this is why he volunteers his
expertise.


For the time being, mining under the old growth forest has been pushed back until the hearings
conclude in November.


For the Great Lakes Radio Consortium, this is Lisa Ann Pinkerton.

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Diverting Great Lakes Water to Cities

  • Fast-growing cities beyond the Great Lakes basin want to withdraw water from the lakes. The Council of the Great Lakes Governors is considering allowing more to do so. (Photo: Sleeping Bear Dunes, Lake Michigan, by Lester Graham)

More cities and businesses outside the Great Lakes basin want to take water from the Lakes. Great Lakes governors and provincial leaders are working on proposed new rules to control water diversions. Their proposal is expected to be released this month. Some say there’s a chance that more communities just outside the basin will get some water from the Great Lakes. The Great Lakes Radio Consortium’s Chuck Quirmbach has the story:

Transcript

More cities and businesses outside the Great Lakes basin want to take water from the Lakes. Great Lakes governors and provincial leaders are working on proposed new rules to control water diversions. Their proposal is expected to be released this month. Some say there’s a chance that more communities just outside the basin will get some lake water. The Great Lakes Radio Consortium’s Chuck Quirmbach has the story.


Only a few communities outside the Great Lakes Basin currently get water from the Lakes, but some inland cities are growing and running short on groundwater supplies. One such city is Waukesha, Wisconsin. Waukesha is 25 miles away from Lake Michigan. The city is on the far side of the sub-continental divide that separates the Great Lakes basin from the basin where surface waters drain to the Mississippi river.


(pump house noise for a few seconds, then fade under)


At the sunset pumping station in Waukesha, blue-painted pumps push groundwater from a large storage tank towards the homes of some of the city’s 65-thousand residents. Waukesha’s population has grown about 30 percent over the last two decades, so water utility general manager Dan Duchniak says the city is pumping more water than it used to…especially during dry periods when people water their lawns.


“When we did not have all the rain we had, we had our peak days around 10-11 million gallons a day – now around 12-13 million gallons a day. It goes up couple hundred thousand gallons per year.”


(gradually fade pump noise out)


No one in Waukesha is doing without tap water, but the groundwater table has dropped 300 feet over the last 50 years. And there’s another problem. Waukesha’s water supply is tainted by radium, a naturally occurring contaminant that could cause cancer. One of Waukesha’s long-term ideas for improving its water is to abandon the city wells and pump in up to twenty million gallons a day from Lake Michigan. In a complicated argument, hydrologists say Waukesha’s groundwater aquifer and the lake are connected anyway, so Dan Duchniak says a pipeline to the lake would not be a new withdrawal of water, and would actually help restore the original natural system.


“All we’re saying to make it real simple right now we have a vertical straw that is pulling water from the aquifer that has its tributary to the Great Lakes, we just want to take that water and make it horizontal for the better of the environment all around us.”


Duchniak has the ear of Wisconsin governor Jim Doyle. Governor Doyle is the new Chair of the Council of Great Lakes Governors. Among other things the council decides on water withdrawals from the Great Lakes. The governors of the eight Great Lakes states and leaders of Quebec and Ontario are expected to soon release a proposal called annex 2001. If passed, it will update rules on diverting great lakes water. Governor Doyle says he opposes sending water out of the Midwest, but he says short-distance diversions might be okay, if there’s a drop for drop return of clean water. Doyle acknowledges he needs unanimous agreement.


“There’s no reason for a governor of another state to approve even a small diversion unless they have some real confidence that the Great Lakes will be protected. That’s the way we protect it. Every single governor needs to approve.”


Governor Doyle says any change in diversion policy is years away. Still, environmental groups are closely watching for the annex 2001 proposal. Reg Gilbert is with Great Lakes United. He says before any more diversions are allowed, the plan should include more guidelines for water conservation. he says the lakes are too important to put them at risk by withdrawing too much water.


“Both our quality of life and a significant part of our economics come from a good functioning Great Lakes and if the rules for protecting it require it being difficult to divert water even those communities that want to divert that water might want to think twice and see it’s in the best interest of the whole region to have pretty strong rules… even if it makes it a little bit harder for some communities to get the water they need.”


Gilbert says he’s also looking for a plan that will pass muster with international trade courts that have questioned the legality of great lakes officials controlling the local waters. Gilbert’s hoping a lot of people will weigh in with their ideas during an upcoming comment period.


For the Great Lakes Radio Consortium, I’m Chuck Quirmbach

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Faster Test for Beach Closings

An Indiana University scientist has developed a computer model that can predict E. coli levels near public beaches. The system could help public health officials who’ve been relying on test results that come too late to be of much help. The Great Lakes Radio Consortium’s Tracy Samilton reports:

Transcript

An Indiana University scientist has developed a computer model that can predict E. coli levels near public beaches. The system could help public health officials who’ve been relying on test results that come too late to be of much help. The Great Lakes Radio Consortium’s Tracy Samilton reports:


E. coli is a bacteria that can reach dangerous levels in the water, usually when big rainstorms flush untreated water into nearby lakes and streams. But traditional tests for E. coli take 24 to 48 hours. Indiana University hydrologist Greg Oliphant says the delay is a serious problem for keeping people safe when they go to the beach.


“Regulators were saying go ahead and go in the water, and E. coli was above safe level, and stay out when water turned out to be perfectly safe for full body contact.”


Olyphant has developed a computer model that uses wind, rain, and temperature readings to predict when E. coli levels will be high. The system has been tested in Chicago and Milwaukee and they found it to be about 80% effective. For the Great Lakes Radio Consortium, I’m Tracy Samilton.

New Push for Shoreline Regulation

Great Lakes regulators are worried people will start building closer to
the lakes because the water levels are lower. The Great Lakes Radio
Consortium’s Lester Graham reports…. they want local governments to
restrict building homes where the owners might regret it later:

Low Lake Levels Impact Work and Play

The water levels of the Great Lakes are down this year…way down.
Lakes Erie, Michigan and Huron are two feet lower than last year at this
time, Lake Superior is down a foot, while Lake Ontario is down three
feet. The Great Lakes Radio Consortium’s Mike Simonson reports that
lower lake levels will have a big effect on people who work and play on
the Lakes: