Longmont water rates keep going up

From The Longmont Times-Call (Karen Antonacci):

The Longmont City Council opted for the middle-of-the road option for funding Longmont’s portion of the Windy Gap Firming Project, despite survey responses of residents that indicated most favored an all-cash option.

The decision, along with the March decision to participate in the water storage project at 10,000 acre-feet, will likely mean water rate increases of 8 percent in both 2017 and 2018, above the 9 percent increases in both years that have already been approved.

The council had three funding options to choose from, while many residents in a survey commissioned for the city expressed doubt that Longmont needs the 10,000 acre-feet of water storage instead of the 6,000 that was originally proposed.

The money for the 6,000 acre-feet is already in the bank and the rate increases and debt come into play to pay for the additional 4,000 acre-feet of storage, Longmont general manager of public works and natural resources Dale Rademacher said Tuesday.

Rademacher said the city needed an extra $16 million to pay for the extra water storage. The council chose to raise $10 million of that cost in “cash” that will come from the rate increases. The remaining $6 million will be debt, which will need to be approved by the council but won’t need to go on a ballot like a larger amount of debt would require.

Some council members expressed surprise that of the 848 households who returned a random city survey on the issue, most favored an all-cash option. Survey data was weighted to more closely match Longmont demographic data. The survey has a 3 percent margin of error.

The all-cash option to raise the money would have raised rates 13 percent in 2017 and 12 percent in 2018 above the already-approved 9 percent increases in both years.

Most people who completed the scientific mail survey favored this all-cash option, with 46 percent of respondents saying they either “strongly support” or “somewhat support” it.

The city also released a web comment form where any resident — not just the ones who received the mailed survey — could tell the council about their preferences. While not scientific, most people online said they didn’t want any of the three options, but of the three, most supported a high-debt, low-rate increase option.

The third option would have required a vote of the people to issue $16.7 million in debt and mean water increases of 5 percent in both 2018 and 2019 above the already 9 percent increase.

Former Mayor Roger Lange spoke during the public-comment portion of the meeting, urging the council to keep water rates as low as they can by reducing the participation in the project back to the 6,000 acre-foot level and use debt.

“It’s surprising that option 1 — the all-cash option — appeared to be favored by the people who got the survey,” Lange said. “In the web response survey, option 1 got the least favorable comments and many said they want none of the options. So it seems these surveys are diametrically opposed.”

Former City Manager Gordon Pedrow also spoke and reiterated that he thought the city should have stayed with the 6,000 acre-feet participation level rather than the increased 10,000 acre-feet level.

“With that rash decision, you have forced upon your residents options along with these horrible rate increases,” Pedrow said. “When residents receive their bills and realize what you’ve done, it will result in a complete loss of trust in you elected officials.”

The Times-Call published a letter to the editor from Pedrow in September that touched on many of the same points, plus urged residents to recall any “draconian” water rate ordinance so it can be put to a general vote. Nine of the respondents in the web survey referenced the letter and said they don’t see the need for the extra 4,000 acre-feet of water storage.

The amount of participation in the Windy Gap decision was strange in that the Longmont water board recommended 10,000 acre-feet while city staff recommended 6,000 acre-feet. The higher participation level passed the council 5-2 with Councilwomen Polly Christensen and Joan Peck dissenting.

Water board Chair Todd Williams spoke during the public-comment portion of the meeting on Tuesday, defending the board’s March recommendation.

Windy Gap is a relatively low-cost option to add water to the collector system, plus is the project that is farthest along in the lengthy approval process, Williams said.

“By the time Windy Gap stores one drop of water, it will have been 20 years since the project started because of all the studies and permits associated with starting it. All other projects have much more uncertainty in terms of implementation, cost and timing,” Williams said.

Williams added that the variables determining how much water Longmont will need in the future are not set in stone. If other entities that Longmont trades water with walked away from the agreement, for example, Longmont would lose some sources of water, Williams said.

Mayor Dennis Coombs said if new information becomes available on whether Longmont needs 6,000 or 10,000 acre-feet of participation, he would like it presented to council. Christensen said she didn’t vote for the 10,000 acre-feet and she would be happy to return to the lower level, but none of the other council members seemed to support the idea.

Coombs said he noticed that people older than 55 years old wanted debt while younger people seemed to lean toward cash.

“My job is to do what I think most people in the city want and not favor one age group over another,” Coombs said. “Option 2 seems to thread the needle and satisfies the most people.”

Metro/South Platte Roundtable meeting recap

Basin roundtable boundaries
Basin roundtable boundaries

From The Sterling Journal-Advocate (Jeff Rice):

A joint meeting of the South Platte Basin and Metro water roundtables Thursday served to generate much-needed optimism that projected water needs can be met by mid-century…

Most of the meeting time was taken up with updates on the six water projects that are under way in Colorado already, and an update on the South Platte Basin study that is supposed to identify even more water storage and conservation measures.

Joe Frank, manager of the Lower South Platte Water Conservancy District headquartered in Sterling, co-chaired the meeting. He opened with the information that a contractor for the South Platte Basin Study will be named on Friday. That study was mandated by the state legislature during its 2016 session and is scheduled to begin next month. It should take about a year to complete.

After the updates came comment from those attending, most of which were requests for clarification or details on the project updates. But there were also words of encouragement and recognition that attitudes have changed from the days of bitter water fights.

Marc Wagge, manager of water resources planning for Denver Water, told the group he’s encouraged by the fact that the metro and agricultural interests are not just talking to each other, but planning and developing projects to their mutual benefit.

“I want to stress again that the best thing that came out of the (statewide) water plan is this right here, the (South Platte) basin study and these two roundtables working together,” Wagge said. He referred to population growth projections for Colorado between now and 2050 and said, “We all recognize that 78 percent of that growth is going to happen right here (on the northern Front Range) and here we are, working together toward a common goal for that.”

Joe Frank echoed those words later, saying that success with the projects already identified and being actively worked on, called Identified Projects and Processes, or IPPs, gives hope that the water shortfall projected by 2050 can be eliminated.

“You saw tonight, that we already have IPP success rates of 88 percent for the metro projects and 65 percent for the lower South Platte,” Frank said. “If we can see that high a success rate with those IPPs, we can see some real progress.”

According to the Colorado Water Plan, by 2050 water demand in the South Platte River watershed, which includes everything north of the Palmer Divide and east of the Continental Divide, to the Nebraska state line, will outstrip supply by 300,000 acre feet per year, or almost 97 billion gallons a year. The existing IPPs could yield up to 98,000 acre feet, leaving more than 200,000 acre feet that has to be found somewhere in the basin.

Jim Yahn, manager of the North Sterling and Prewitt reservoirs, and a member of the Lower South Platte roundtable, said he, too, is encouraged by the cooperative attitudes expressed during the meeting.

“In the end, we’re a lot like-minded in the South Platte basin, as a group,” Yahn said.

But Yahn did sound a word of caution about water studies that seem to be “fast-tracked” on the Western Slope, possibly with the intent of showing that there’s no more water available.

“We have as big or bigger stake in those studies as anyone has,” Yahn said. “I want us to work together to find solutions that will benefit both sides.”

Denver Water and irrigators in the Thompson River and South Platte River valleys all depend heavily on water diverted from the snow-laden Western Slope to the arid Eastern Plains. The Colorado-Big Thompson system diverts up to 310,000 acre feet of water a year to cities and towns northeast of Denver while the Moffat/South Platte system diverts another 284,000 acre feet of water from the Western Slope to the Denver Metro area.

Don Ament, former Colorado Agriculture Commissioner and state senator, was in Loveland for other water-related meetings and sat in on the joint meeting for a time. He said later that Yahn’s concern is a valid one and that, for all of the optimism voiced at Thursday’s meeting, he’s still worried about future water supplies.

“If this (Colorado Water Plan) doesn’t come to fruition, ag water is still vulberable, and I’m worried about that,” Ament said. “When a project takes 13 years and we still don’t have a resolution, that worries me. I just think there’s a lot of risk out there.”

Still, he said there’s hope as long as disparate water users are talking amicably among each other.

“As a group, the lower South Platte and the metro area are working to find solutions together,” he said. “Now we’re talking to each other. And that’s a good thing.”

stopcollaborateandlistenbusinessblog

More coverage from Jeff Rice writing for the Sterling Journal-Advocate:

Most of the meeting time during the joint roundtable meeting in Loveland Thursday night was taken up with updates on the six water projects that are under way in Colorado already. Here is a rundown of those six projects, or IPPs:

• The NISP/Glade project — The Northern Integrated Supply Project is a proposed water storage and distribution project that will supply 15 Northern Front Range water partners with 40,000 acre-feet of new, reliable water supplies.

• Chimney Hollow Reservoir — A 360-foot high dam that will hold 90,000 acre feet to help supply the thirsty Thompson Valley urban area. The water will come from the Windy Gap Project, a diversion dam and pumping station completed in 1985 to provide extra irrigation and municipal water out of the Colorado River. The water originally was stored in Grand Lake, but when that is full, the water cannot be stored. Chimney Hollow, also known as the Windy Gap Firming Project, solves that problem.

• Halligan reservoir enlargements — Halligan Reservoir near Fort Collins is about 100 years old. Its capacity is about 6,400 acre feet of water and the City of Fort Collins wants to add 8,125 acre feet to the reservoir by raising its dam about 25 feet.

• Milton Seaman Reservoir enlargement — Greeley originally had wanted to expand Seaman Reservoir in conjunction with Halligan, but because of diverging goals Greeley withdrew from the joint project. The expansion of Seamon now is targeted for design in 2028 and construction by 2030.

• Gross Reservoir enlargement — Gross Reservoir is one of 11 reservoirs supplying water to the City of Denver and surrounding urban areas. It is on the city’s Moffat System, which diverts water from the Western Slope to the metro area. Denver Water has proposed raising the dam height by 131 feet, which will allow the capacity of the reservoir to increase by 77,000 acre feet.

• Chatfield Reallocation Plan — The U.S. Army Corps of Engineers has determined that Chatfield Reservoir, built primarily for flood control after the 1965 South Platte River flood, can accommodate an additional 20,600 acre feet of water storage for water supply without compromising its flood control function. This additional storage space will be used by municipal and agricultural water providers to help meet the diverse needs of the state. No actual construction is required, but the legal, environmental, and engineering concerns of allowing the reservoir to hold more water all have to be satisfied.

#ColoradoRiver: Doing more with less water — Allen Best #COriver

From Aspen Journalism (Allen Best) via The Aspen Daily News:

Denver Water implements ‘Learning By Doing’ program in the high country

A decade ago, Kirk Klancke had hard, cold feelings about Denver Water. A stonemason for 35 years who moved to the Fraser Valley in 1971, he was passionate about the outdoors, particularly fly-fishing, and was outraged by depleted flows of the Fraser River and tributary creeks below a network of transmountain diversions.

Listening to Denver Water’s plans to step up diversions from these Colorado River tributaries, Klancke would seethe.

Today, Klancke almost gushes with compliments.

“Denver has been a treat to work with,” Klancke said one day in August at his home near Tabernash, located eight miles from the Winter Park ski area.

Denver Water still intends to divert more spring runoff. But what has won Klancke’s support is the utility’s commitment to an adaptive management program called Learning By Doing.

Part of the program includes about 30 people conferring weekly to address water issues in the upper Colorado River basin upstream from Kremmling, where up to 80 percent of the water may soon be diverted to the arid side of Colorado along the Front Range.

The conference call is modeled on a similar weekly call used to coordinate water deliveries, including from Ruedi Reservoir, to protect endangered fish in the Colorado River in the Grand Junction area.

During those calls, information is exchanged by water managers, and sufficient deliveries are usually ascertained. And decisions are made by consensus.

So far in the Learning By Doing effort, Denver Water has shown a willingness to juggle its diversions in response to conditions on the once-pristine streams in Grand County.

For example, in late July, Klancke noted warm water and dying fish in Ranch Creek, a tributary of the Fraser River. He told Denver Water about the low flows, but he didn’t really expect a response. To his surprise, utility officials offered to rejigger its diversions to make the flows in Ranch Creek last longer.

“It really helped Ranch Creek a lot,” says Klancke, the president of the Colorado River headwaters chapter of Trout Unlimited.

Learning By Doing is partly about manipulating diversions in the most environmentally friendly way possible, Klancke says. In the past, that wasn’t a concern “because they have just been operated like plumbing.”

The program is now gaining some notice in other headwater valleys, including the Roaring Fork, which is also substantially dewatered by transmountain diversions built in the 1930s and 1960s.

Pitkin County Commissioner Rachel Richards, who has focused for years on water issues, says Learning By Doing “clearly is a sound concept, modifying approaches based on science and data feedback. But we’re not sure we’ve seen enough actual implementation to judge whether it’s a valid tool.”

As you go

Learning By Doing is like a river trip without a precise itinerary. It acknowledges broad impacts to water-dependent ecosystems from Denver Water’s existing transmountain diversions and those of others. However, it doesn’t presume to know exactly how to lessen the impacts of existing diversions, let alone impacts of new ones.

The Moffat Firming project, which sparked the Learning by Doing effort, is being proposed by Denver Water. The nearby Windy Gap Firming project, on the main stem of the Colorado River below Granby, is a proposal from Northern Water. Both projects are part of Learning By Doing, although Northern is not a signatory to the underlying agreement for the program, the Colorado River Cooperative Agreement.

Both firming, or expansion, projects were conceived many years ago, but they were pushed forward after the 2002 drought. The drought crystalized Denver Water’s worries that it couldn’t supply enough water to its northern service area.

As such, Denver Water has proposed to divert more water from tributaries of the Colorado River and send it through its existing Moffat Tunnel system to an expanded Gross Reservoir, which is in the mountains southwest of Boulder.

The two big transmountain diversion systems in Grand County managed by Denver Water and Northern Water, plus several smaller ones, have annually removed an average of 67 percent of the water in the Colorado River below Windy Gap, according to the final environmental impact statement on the Windy Gap firming project.

The two proposed expanded diversions would bump that up to a combined 80 percent. By comparison, about 40 percent of water in the upper Roaring Fork and Fryingpan headwaters goes east, not west. That’s significant, but the upper Colorado River has been hit even harder.

The U.S. Army Corps of Engineers, the final decision-maker on both the expanded Moffat and Windy Gap diversions, now expects to issue decisions on the proposals in 2017.

The political landscape

The agreement that yielded Learning By Doing is grounded in political realities.
Denver Water needed Western Slope support to get more water. But to get it, the utility had to acknowledge a moral responsibility to address the impacts of existing diversions. That responsibility is now reflected in a legal agreement.

Denver Water initially submitted models about the effects of its proposed increased diversions. Trout Unlimited and other environmental groups were skeptical.

“A lot of water has been taken out of these rivers,” says Mely Whiting, an attorney for Trout Unlimited. “We were not convinced any model was going to be able to predict what would happen [with increased diversions] or what will happen with climate change.”

The message to Denver Water, she says, was “if you want more water, you have to fix problems we already have, and you have to make sure we don’t have more problems. That’s what we believe Learning By Doing is all about.”

Will the Colorado River actually end up being better off after the diversions?

“I think so,” Whiting says. “That’s the goal. That’s what we’re shooting for.”

But the upper Colorado River basin may never be as pristine as it once was.

“The goal is not to make it natural,” says Whiting. Instead, Learning By Doing aims to “make it better.”

Other environmental advocates reject this reasoning.

“Grand County got bad legal advice,” says Gary Wockner, executive director of Fort Collins-based Save the Colorado. “The river is already drained and depleted, and climate change is just going to make it worse. When you’re heading for a cliff in your car, the first thing to do is take your foot off the accelerator.”

Water conservation, Wockner contends, “is always cheaper, easier and faster than trying to build a massive new dam, as is buying and sharing water with farmers.”

Trout Unlimited sees things differently.

“We have said ‘yes, let’s conserve,’ and we do everything we can to really engage in pushing forward conservation,” Whiting said. “But we also need to figure out how to best protect the river with its projects moving forward.”

Might the parties that divert water from the Roaring Fork River watershed, which include Colorado Springs, Aurora and Pueblo, as well as irrigators in the Arkansas River Valley, ever feel a moral obligation to address the impacts of their diversions?

Chris Woodka, a former water reporter and the new issues management coordinator for the Southeastern Colorado Water Conservancy District in Pueblo,
was at least willing to consider the question last week.

Southeastern manages the Fry-Ark project, which diverts water from Hunter Creek and a string of tributaries in the upper Fryingpan River basin.

“We’re probably not going to suggest anything that would take less water,” Woodka says. “But if we are asked to do something, we would certainly look at it. But our primary obligation is to bring supplemental water to the Arkansas basin.”

And an important factor for the Roaring Fork watershed to consider may be this: Learning By Doing is the result of a proposal to increase transmountain diversions and is not simply born of a desire to better manage the streams already depleted by them.

Improving relations

Denver Water, the Western Slope, and environmental groups have long had an adversarial relationship.

And when the utility initiated the federal review process in 2003 for expansion of its transmountain diversions through the Moffat Tunnel, Eric Kuhn, general manager of the Colorado River Water Conservation District in Glenwood Springs, sent a proposed “global settlement” to Denver Water.

Denver Water rejected the specific proposal, but not the idea and submitted a counter-proposal in what then became an extended negotiation.

Soon, headwaters counties — especially Grand, Summit, and Eagle — came to agree that there had to be a global agreement among the affected counties in response to Denver Water’s proposal. Mediated negotiations began in 2007 involving 43 parties, most of them located on the Western Slope.

A key figure representing Grand County in the process was Lurline Underbrink Curran, a county native who became a planner and then the Grand County manager, a position she recently stepped down from.

Working with Denver Water, Curran decided, could yield more benefits than a courtroom brawl. But developing trusting relationships took time.

Curran, known for being plain-spoken and direct, credits the directors that Gov. John Hickenlooper appointed to the Denver Water board when he was mayor of Denver. She said they were able to acknowledge an important truth.

They were “willing to step back and go, ‘Well, we have had a huge impact and if at all possible we need to improve the area that we take the water from,’” she said.

Denver Water, in turn, shared modeling studies with Grand County after securing a promise that the models wouldn’t be used against it legally.

‘A really big deal’

Grand County also commissioned its own expensive stream management plan that brought science to the argument.
Paul Daukas, environmental planning manager for Denver Water, was impressed by that plan.

“It givers them the science, so they can frame their needs and wants in a scientific way,” he said. “That plan became the foundation for Learning By Doing.”

Learning By Doing is included in the 2013 Colorado River Water Cooperative
Agreement, the result of the long negotiating process with Denver Water.
And Curran says Learning By Doing puts Grand County, with its multiple tasks, on par with Denver Water, an agency with a singular focus.

“That is a really big deal,” Curran says.

Denver Water and the Windy Gap sponsors aren’t legally required to participate in Learning By Doing until they get all their federal permits.

Nonetheless, in 2011, they joined the state, Grand County and other partners to begin to explore how to do more for rivers with less water.

Diminished flows distress the web of life found in rivers. Macroinvertebrates — bugs — live in the gaps between rocks in rivers. Reduced flow means less velocity, and sediments are not swept from between the rocks. Less room for bugs means fewer of them, and fewer bugs means fewer fish.

Klancke, the avid fly-fisherman, can point to reaches of river in Grand County where President Dwight Eisenhower snagged big trout during summer vacations in the 1950s.

But now he can also point to segments of the Fraser River where summer flows, depleted by diversions, are too shallow for the width of the channel, resulting in water dangerously warm for fish and the bugs they depend upon.

“They heat up in ways they never did before,” says Klancke of the tributaries in Grand County. “Seventy degrees is the limit trout can withstand.”

One recent response has been to narrow a section of the Fraser River’s channel for nine-tenths of a mile and add riffles and pools. The ongoing Fraser Flats project will cost $201,000, with various parties, including a private landowner, chipping in.

Denver Water’s portion of the Fraser Flats project is only $50,000, part of $2 million earmarked for aquatic habitat improvements under the Colorado River Cooperative Agreement. The agreement says that Denver Water will provide $11 million to Grand County in all.

That agreement also obligates the utility to bypass 1,000 acre-feet that it could divert. The water is to be used for environmental purposes in the Fraser Valley.
After the work is done at Fraser Flats next year, stream temperatures and other indicators will be monitored for several years.

The procedure, explains Denver Water’s Daukus, is to see what benefit has occurred, “so that when we go to the next project, we can see what has worked and what won’t work.”

But Wockner of Save the Colorado thinks Grand County settled for a “terrible deal.”

“The two dam and diversion projects would take over a billion dollars of water over to the Front Range,” he says, referring to the Moffat and Windy Gap firming projects.

“Grand County settled for about one percent of that in mitigation costs, which is a fleecing of money as well as water.”

As for the “channel enhancement” at Fraser Flats, he sees only a narrowed irrigation ditch.

“The Fraser and Colorado rivers need more water, not less,” Wockner says.

Still, proponents say Learning By Doing provides a model. They say it requires commitment by people to be stewards of rivers in their backyards. It requires mechanisms for addressing problems. It requires cooperation among diverse partners. And it requires compromise.

Denver Water’s most important change, says Klancke, may be a new focus. Instead of a singular focus on delivering water to customers it may now have a broader focus that includes maintaining the health of the basin of origin, he says.

“That’s the culture they’re changing,” he said. “I won’t say it’s successful until the scientists say it’s healthier than it used to be. But we’re headed in the right direction.”
Richards, of Pitkin County, is still not sure Learning By Doing has sufficient teeth to compel change.

“It will depend,” Richards said, “on whether what is learned actually ends up changing what the water diverters do.”

Editor’s note: Aspen Journalism and the Aspen Daily News are collaborating on coverage of rivers and water. More at http://www.aspenjournalism.org.

#ColoradoRiver estuary dead clams tell tales of carbon emission — Cornell University #COriver

At the Colorado River delta, cheniers of dead clam shells epitomize the carbon dioxide being added to the atmosphere upstream. Photo credit Jansen Smith via Cornell University.
At the Colorado River delta, cheniers of dead clam shells epitomize the carbon dioxide being added to the atmosphere upstream. Photo credit Jansen Smith via Cornell University.

From Science Daily (Blaine Friedlander):

Scientists have begun to account for the topsy-turvy carbon cycle of the Colorado River delta – once a massive green estuary of grassland, marshes and cottonwood, now desiccated dead land.

“We’ve done a lot in the United States to alter water systems, to dam them. The river irrigates our crops and makes energy. What we really don’t understand is how our poor water management is affecting other natural systems – in this case, carbon cycling,” said Cornell’s Jansen Smith, a doctoral candidate in earth and atmospheric sciences.

Smith is lead author of “Fossil Clam Shells Reveal Unintended Carbon Cycling Consequences of Colorado River Management,” published in the journal Royal Society Open Science, Sept. 28.

The new research, in collaboration with the University of Arizona and the Cornell-affiliated Paleontological Research Institution, provides a novel approach that combines biological and paleo methods to understand how a nearly dead river delta presents evidence of vast amounts of carbon being added to the atmosphere.

Smith said the river’s tidal flats should teem with clams. But thanks to 15 dams on the main river and hundreds more on its tributaries, the 1,400-mile-long, once-mighty Colorado drips to a trickle before emptying into Mexico’s Gulf of California. Based on estimates of washed-up clamshells that lived hundreds of years ago and the number of clams alive today, the researchers calculated the change of the river delta’s annual carbon cycle.

“You used to step on clams with every step you took,” he said. “Now, you don’t.”

While their shells are a natural carbon sink, living clams belch carbon dioxide as they breathe. A thriving delta can emit the carbon equivalent of about 15,000 cars annually, but the Colorado River’s clams have died off, emitting less carbon dioxide. Said Smith: “It would be tempting to say, ‘Look at this positive effect,’ but it is not positive.”

Large western cities like Los Angeles, Phoenix, Tucson and Las Vegas draw the Colorado’s water, while the carbon cost of transporting that water to cities and farms far outweighs the humble clam’s own emissions.

For example, the Colorado River’s waters cool the coal-fired Navajo Generating Station in Page, Arizona, a 2,250-megawatt power plant that supplies energy to California, Arizona and Nevada. The coal-fired electricity station emits the equivalent of 4.5 million cars annually – one of the largest carbon dioxide emitters in the United States.

Beyond the power plants, water is pumped from the river to places like Las Vegas to feed lavish water fountains or Arizona to water golf courses.

“The reduced carbon emissions at the delta – resulting from diverted flow, conveying water to Southwestern cities – are vastly outweighed by the carbon emissions to divert that flow,” said Smith. “We’ve supplanted a small, natural carbon emitter – the clam – with something far more detrimental to the atmosphere.”

The study’s authors include Daniel Auerbach, Office of Wetlands Protection and Restoration, U.S. Environmental Protection Agency; Alexander Flecker, professor of ecology and evolutionary biology at Cornell; Karl W. Flessa, professor of geosciences, University of Arizona; and Gregory Dietl, Cornell adjunct assistant professor of earth and atmospheric sciences, and the Paleontological Research Institution, Ithaca. Cornell’s College of Engineering funded Smith.

A subset of the processes involved in estuarine carbon cycling. (1) Sequestration of carbon via vegetation (e.g. salt marshes, mangroves) growth, death and burial; (2) emission of carbon due to reworking of carbon-rich sediments; (3) constant gas exchange between ocean and atmosphere; (4) emission of carbon via respiration by microbes and zooplankton; (5) sequestration of carbon via burial of dead plankton; (6) filter feeding by bivalves; (7) carbon emission via bivalve respiration; (8) carbon sequestration via biodeposition and (9) carbon sequestration and emission via biocalcification. Figure via Jansen Smith and Cornell University.
A subset of the processes involved in estuarine carbon cycling. (1) Sequestration of carbon via vegetation (e.g. salt marshes, mangroves) growth, death and burial; (2) emission of carbon due to reworking of carbon-rich sediments; (3) constant gas exchange between ocean and atmosphere; (4) emission of carbon via respiration by microbes and zooplankton; (5) sequestration of carbon via burial of dead plankton; (6) filter feeding by bivalves; (7) carbon emission via bivalve respiration; (8) carbon sequestration via biodeposition and (9) carbon sequestration and emission via biocalcification. Figure via Jansen Smith and Cornell University.