Category Archives: Agriculture

Lessons in Ag Water

By Greg Peterson, the Colorado Ag Water Alliance

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Weld County farmer Dave Eckhardt at the crossing point of the Western Mutual and Union Ditches near La Salle, CO.

I could be wrong, but Longmont farmer Jerry Hergenreder is probably twice my age and can set a dozen siphon tubes while I’m still struggling with one. By the tenth attempt, I was gazing longingly at the center pivot sprinkler in the next field wondering how he does this at 6:00 a.m., 2:00 p.m., and 10:00 p.m. to irrigate his sugar beet field. Despite seeming inefficient, this method of irrigation is ideal for certain crops, producing better yields than more “modern” irrigation methods. However, this revelation didn’t compare to when I learned that you only get one mature ear of sweet corn for each stalk or how to tell a bale of hay from a bale of alfalfa (one is greener, but be careful, sometimes they mix hay and alfalfa). These lessons are important, especially for a city slicker like me who consumes food every day but doesn’t really understand the infrastructure, work, and water necessary for the food I eat.

Jerry Hergenreder’s farm was just one stop on a recent tour by The Colorado Ag Water Alliance for people outside of agriculture to learn more about irrigation, conservation, how water is used in agriculture, and what problems farmers face. Water resource engineers, consultants, legislators, lobbyists, students, conservationists and congressional staff joined us on two tours: one in the Greeley area and another in Longmont, Fort Lupton and Brighton.

It was a great opportunity to meet farmers and ask them directly how they use water, the different types of irrigation they use and why they grow certain crops. Both tours began with a presentation by the Colorado Department of Agriculture, the Division of Water Resources and an overview of the value chain of agriculture in Colorado. With this as the backdrop, we quickly got into the fields.

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Kendall DeJonge, USDA-ARS agricultural engineer, describes the drip irrigation system at the USDA testing site in Greeley, CO.

Up in Greeley, the tour explored several sites including the Eckhardt Farm and Fagerberg Farm, ditch diversions, recharge ponds, and a U.S. Department of Agriculture- Agriculture Research Service (USDA-ARS) testing site. Speaker after speaker emphasized the importance and complexity of return flows and showed how farmers along the South Platte are interconnected through water and irrigation practices. In Longmont, Fort Lupton and Brighton, we also toured the Fulton and Brighton Ditches, spoke with ditch riders, and visited Sakata Farms and River Garden Vineyard, the only vineyard in Weld County. The programs also included presentations on ditch administration, soil health, and the state of young farmers in Colorado.

On the tours, the impact of Colorado’s growth is hard not to notice. Rapid urbanization, the transfer of water rights to municipalities, traffic and even trash, are now everyday obstacles farmers along the Front Range. With all of this growth and change, CAWA wants to emphasize that agriculture isn’t a relic of an older time that needs to make way for progress. These farming communities provide a lot of social, economic, aesthetic and environmental benefits that we may not be fully aware of.

CAWA is working with the Colorado Foundation for Water Education and National Young Farmers to host a similar tour late September in Rocky Ford.  You can learn more about us and stay informed at coagwater.org.

CAWA relies on grants and sponsorships for most of our funding. These tours wouldn’t have been possible without the support of the Metro Basin Roundtable, Agfinity, Colorado Corn, Northern Water, Denver Water, Aurora Water, Pawnee Buttes Seed, the City of Longmont and the West Adams and Boulder Valley Conservation Districts.

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Greg Peterson has recently been involved in water issues in Colorado after receiving a Masters in Political Economy of Resources from The Colorado School of Mines and working as a teacher before that.  He has worked as a research associate at the Colorado Water Institute and is currently working with the Colorado Ag Water Alliance and enjoys learning about economics, agriculture and rural Colorado. 

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Preventing Water Pollution Starts in Your Backyard

USDA

Photo Credit: USDA

Agricultural runoff is a prominent source of excess nutrients in water sources, but this nonpoint source of water pollution can originate with excess fertilizer being used on urban landscapes as well.

On April 13, 2017, the Colorado Foundation for Water Education was joined by Steve Lundt with the Barr Lake and Milton Reservoir Watershed Association for a webinar about cyanotoxins, algal blooms, public health and efforts to reduce nutrients in our water. 

“[BMPs] apply to your own lawn, just as they do on a corn field in Weld County,” says Lundt. “Don’t [fertilize] before a storm event and do soil testing—you may not even need phosphorus to grow your lawn.”

Sam DeLong

Photo Credit: Sam DeLong

So, what can an urban lawn owner do when they want to grow a vibrant, healthy, lawn without contributing to nutrient pollution? The following blog post by American Turf & Tree Care discusses ways that people can reduce phosphorous pollution in Colorado’s water sources by ensuring that the way they care for their yard benefits not only their lawn, but also the environment.

 

Preventing Water Pollution Starts in Your Backyard

By American Turf & Tree Care

JasenMiller

Photo Credit: Jasen Miller

There are a number of reasons why Denver and surrounding cities are among the fastest-growing metropolitan areas in the country, but certainly, one draw is the immense natural beauty of Colorado. Beautiful mountains and flowing streams make our area an outdoorsman’s paradise—tourists and Colorado residents alike flock to the area for hiking, camping and a chance to take in the scenery.

With the uncertainty that accompanies recent EPA spending cuts and policy changes, many people in the area rightfully have concerns regarding sustainability and important environmental regulations that protect these natural resources. In light of this, it becomes ever more important for businesses and individuals to make responsible decisions about actions that may impact the future health and beauty of our area.

Mike Sinko

Photo Credit: Mike Sinko

Improper management of industrial waste, sewage and agricultural runoff are some of the worst offenders when it comes to pollution, but there are still a number of actions individuals can take to preserve Colorado’s water. Mindfulness, when it comes to the products you use in your backyard, can be a first step toward fighting pollution.

Phosphorus Pollution: Too Much of a Good Thing

Kevin Dooley (2)

Photo Credit: Kevin Dooley

Phosphorus is a natural ingredient found in soil that promotes root development and helps trees, shrubs and other plants mature and thrive. But if your lawn already has a sufficient level of phosphorus in the soil, fertilizer treatments can actually have a detrimental effect on the health of your grass and can lead to pollution.

Phosphorus works by attaching itself to soil particles, which are then absorbed by plants during their life cycle. When strong fertilizers are used in your lawn or garden, it can slow down the absorption process. In the meantime, heavy rains can wash phosphorus from your yard into ponds, streams, rivers and lakes nearby.

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Photo Credit: Dr. Jennifer L. Graham

Phosphorus contamination can kill fish, cause algae to grow at alarming and dangerous rates, turn water green and lower water quality, leach into drinking water and eventually contribute to “dead zones” in the ocean. The good news is that this pollution is largely avoidable, as most excessive phosphorus present in the environment is washed into natural bodies of water as the direct result of human activities.

Regulation Is Only the First Step

Boston Public Library

Photo Credit: Boston Public Library

The damage caused by phosphorus pollution is so severe that many states, Colorado included, have enacted laws to limit the use of phosphorus-heavy fertilizers. The Colorado Fertilizer Law, as enforced by the Colorado Department of Agriculture, regulates fertilizers and soil conditioners sold in Colorado for agricultural and residential use. The law requires that fertilizers be properly labeled with their tested nutrient levels – but these limitations only work if businesses and homeowners share a commitment to choosing fertilizers with low to no phosphorus.

“Pay attention to the three number label on the fertilizer you buy,” says Brad Woods, owner of American Turf & Tree Care in Greeley. The first number is nitrogen, the second is phosphorus, and the third is potassium. “You want to look for a bag where the second number is a zero or is low.”

How You Can Go Phosphorus-Free

You may not need additional phosphorus in your lawn. “Most lawn care providers offer complimentary soil testing and they can tell you what nutrients you need to restore balance to your lawn,” says Woods.

“One common mistake homeowners make is trying to fertilize dormant grass. When grass looks like it’s dying, but it’s just at the natural end of its growth cycle for the year, dumping fertilizer on top will actually do more harm than good,” says Woods. “If your soil is lacking phosphorus, a lawn care company can help you fix it in a way that is safe for your family and the environment.”

There are also some techniques you can use as part of your normal lawn maintenance routine to keep your yard naturally rich in phosphorus without the use of fertilizers, including:

  • NancyBeeToo

    Photo Credit: NancyBeeToo

    Composting: There is no better source of natural phosphorus than composted fruits and vegetables.

  • Tapping Organic Sources: If you need phosphorus and do not have access to compost, bone meal, manure, bat guano or soy meal will also do the trick! These materials are rich in nutrients and release phosphorus slowly, without the risk of contaminating water.
  • Mowing: When you mow your lawn in spring and summer, don’t bag the clippings! Grass clippings are high in phosphorus, and as long as they don’t mat the grass and block sunlight and oxygen from reaching your soil, they can be helpful in returning nutrients to the soil.
  • Don’t Overwater: Not only is overwatering bad for general lawn health, but it increases the risk of washing phosphorus out of your landscape.
Zach Dischner

Photo Credit: Zach Dischner

Don’t wash the natural beauty of Colorado down the drain! Water pollution is far-reaching, and contamination can hurt local wildlife, impact the health of you and your family, and disrupt the environment at large.

Being conscientious about the products you or your lawn care team uses in your yard is a simple way to fight back against pollution and protect your local ecosystem.

American Turf & Tree Care is a locally-owned company in Colorado on a mission to educate the local community on the impact their lawn care products have on the environment.  For more information about American Turf & Care, please visit http://www.americanturfandtreecare.com/.

Listen to the recording of the April 2017 webinar presented by the Colorado Foundation for Water Education and offered in partnership with Colorado Water Congress with support from the Colorado Department of Public Health and Environment. Read more about agricultural runoff as nonpoint source pollution in the CFWE blog post, The Runoff Conundrum.

hw_fall_2016_final_coverFind further coverage on these topics in the Public Health Issue of Headwaters Magazine and learn more about water quality in CFWE’s Citizen’s Guide to Colorado Water Quality Protection.

Not a Headwaters subscriber? Visit yourwatercolorado.org for the digital version. Headwaters is the flagship publication of the Colorado Foundation for Water Education and covers current events, trends and opportunities in Colorado water.

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Filed under Agriculture, Environment, Water Education and Resources, Water Quality

The Runoff Conundrum

When a summer storm crosses the eastern plains, drowning farmlands in a deluge, more than water ends up flowing into Colorado’s rivers, lakes and streams.

On April 13, 2017, the Colorado Foundation for Water Education was joined by Troy Bauder, with Colorado State University Extension, for a webinar in which part of the discussion centered on nonpoint source pollution. Bauder focuses on working with agricultural producers to reduce nutrient losses on their fields.

Runoff, a nonpoint source, occurs when there is more water than the soil can absorb. Agricultural runoff carries a bit of everything it touches—excess fertilizer, animal waste, soil and more. Water that is not absorbed into the ground moves across the land, picking up whatever it can carry, and drains into surface water and groundwater sources.

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Photo Credit: Lynn Betts

“Ag nutrients—nitrogen (N) and phosphorus (P)—are absolutely required for productive agriculture,” Bauder says. “Of course, we need good management to prevent the accumulation of too much N and P in our soils and to reduce the potential for movement to surface and ground water.”

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Photo Credit: Dr. Jennifer L. Graham

When nitrogen and phosphorus—two nutrients found in agricultural runoff—are deposited in excess in water bodies, it leads to algal blooms, reduced dissolved oxygen content, which is harmful to aquatic plants and animals, and can compromise drinking water supplies.

If rain falls on 30 farms, with 20 of them using fertilizers to supplement nutrients in the soil, and the excess of these nutrients finds its way into the runoff, who is to blame for compromising water quality? Who is responsible for nutrient pollution? Since no one farm can be blamed for the degradation of water quality, agricultural runoff is a challenging nonpoint source pollutant to manage and regulate.

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Photo Credit: USDA

Colorado’s Regulation 85, a nutrient policy passed in 2012, regulates point sources of nitrogen, phosphorous and chlorophyll a in surface water, setting discharge limits and requiring monitoring; however, Regulation 85 currently allows for a voluntary, incentivized, approach for reducing nutrient pollution that originates in nonpoint source pollution.

“We’ve partnered with CDPHE [the Colorado Department of Public Health and Environment] to produce some resources and an outreach program called Colorado AG Water Quality,” Bauder continues. “The purpose of this outreach effort is to get the word out to growers about how Reg. 85 could potentially affect them.”

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Photo Credit: USDA

Taking ownership of nutrient pollution and implementing best management practices gives agriculture the opportunity to avoid stringent state regulations. In 2022, the current, voluntary, approach will be evaluated to determine if progress has been made with the implementation and adoption of best management practices (BMP) as they relate to nonpoint source pollution, agriculture and water quality. Additional regulations may be considered depending on the results.

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Conservation Tillage Photo Credit: USDA

Reducing nutrient pollution is achieved through the implementation of BMPs, including improvements in fertilizer management, conservation tillage, irrigation, manure handling and soil erosion. The adoption of BMPs by Colorado agricultural producers benefits agriculture, as well as water quality. When implemented successfully, not only will there be a reduction in nutrient pollution, but it will reduce the need for future regulation.

“We want to work with our growers on the agronomic and economic feasibility of these practices to help them understand how they can help their bottom line,” Bauder says.

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Nitrogen Application                              Photo Credit: Bob Nichols

BMP effectiveness depends on what is known as the 4 R’s: Growers need to use the right amount (rate), right placement, right timing and right source. Combined with improved irrigation management, these BMPs improve the efficacy of the nutrients and prevent the potential for movement, which often results in nonpoint source pollution. Irrigation management can include altering the method by which water is delivered with system upgrades, combined with scheduling watering at the right time of day and in the proper amounts to reduce runoff. Ultimately, implementing these BMPs will benefit the grower’s bottom line while simultaneously protecting water sources from being impacted by nutrients.

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Photo Credit: USDA

“It’s definitely important to engage growers early and often in the process,” Bauder concludes. “Not only the growers, but their representatives, commodity groups and the people who advise them.”

While nutrients are certainly necessary for successful and sustainable agriculture, the execution of BMPs will help mitigate nutrient loss and movement, and in turn, reduce nonpoint source pollution due to runoff. Providing incentives, tools and resources to growers is critical to BMP implementation and success, as well as keeping Colorado’s water sources clean and reducing the impact of nutrient pollution.

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Photo Credit: NOAA

Learn more about cyanotoxins, algal blooms, public health and efforts to reduce nutrients in our water when you listen to the recording of this April 2017 webinar presented by the Colorado Foundation for Water Education and offered in partnership with Colorado Water Congress with support from the Colorado Department of Public Health and Environment. Hear about how municipal recreational lakes are monitoring and working to reduce algal blooms, discover how agricultural producers coming together and implementing best practices to minimize nutrient runoff and learn the basics of toxic algal blooms.

hw_fall_2016_final_coverFind further coverage about this topic in the Public Health Issue of Headwaters Magazine.

Not a Headwaters subscriber? Visit yourwatercolorado.org for the digital version. Headwaters is the flagship publication of the Colorado Foundation for Water Education and covers current events, trends and opportunities in Colorado water.

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Filed under Agriculture, Colorado Foundation for Water Education, Environment, groundwater, Headwaters Magazine, Water Quality

Water Challenges for Young Western Farmers

When you hear the word “farmer,” what is the first thing that comes to mind? Most people have a preconceived notion of what farming looks like, as well as what is involved in the actual practice of farming. While the average age of an American farmer is 58, and farmers over the age of 65 outnumber farmers under 35 by a ratio of six-to-one, the next generation of farmers is emerging across the country. Their work is yielding joys and challenges previously not experienced, as young farmers face a future impacted by drought, climate change and increasing municipal demands on water supplies.

This recent crop of innovative young farmers is featured in the newly released short film Conservation Generation, presented by the National Young Farmers Coalition (NYFC), an organization that “represents, mobilizes, and engages young farmers to ensure their success.” The four young farmers featured in Conservation Generation are working hard to run successful farms in the arid West, with two of them farming on Colorado’s Western Slope; Harrison Topp of Topp Fruit in Paonia, and Tyler Hoyt of Green Table Farms in Mancos.

One of the major struggles for farmers in this part of the country is the ever-increasing scarcity of water. This challenge requires that farmers find innovative solutions to the water shortages that they face. In blog posts they’ve written for the National Young Farmers Coalition to accompany the video, Topp and Hoyt each explain that picking the right land to farm was a crucial component for ensuring that their farms will have access to water.

“Water needs to be at the forefront of how we operate because it will (hopefully) help to keep us in business,” Hoyt says in the film. Both farms are located close to the headwaters of the rivers and streams that Hoyt and Topp draw from, ensuring that the water used for irrigating their crops is less likely to be contaminated by pollutants than it might be if they were further downstream.

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Tyler Hoyt         Photo Credit: NYFC

The farmers employ irrigation techniques that allow them to conserve and make the best use of the water that they are able to use. For Topp, this involved improving the method for transferring the water they are allowed to take from the Fire Mountain Canal to the orchard.

“We had a beautiful (but totally inefficient) network of hand-dug ditches that delivered water across the orchard,” says Topp, in one of his blog posts about the original irrigation system on his farm. “Stones, dirt, shovels, tarps and metal fragments were used to get the water to flow where I wanted. It could take hours to get the right amount of water kind of close to where I needed it to go.”

According the U.S. Environmental Protection Agency, as much as 50 percent of water used for irrigation is wasted due to evaporation, wind, or runoff caused by inefficient irrigation methods and systems. While Topp notes that their new method of irrigation—use of a gated pipe—is not as efficient as he would like, it works well for the orchard, and is an improvement.

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Photo Credit: NYFC

On Green Table Farms, Hoyt employs a host of methods that allow him to make the most of the water that he has access to. “I grow a lot of indigenous crops; those varieties that have been grown out here under dry land conditions for a very long time,” Hoyt explains in the film. “[The use of] drip tape is definitely a huge way that we manage our water so that in those years when we get very little, we can still irrigate.”

The face of farming in the United States is changing. With those changes come new challenges, some of which are the result of  climate change and increasing water scarcity. Young farmers across the country, like those featured in Conservation Generation are optimistic that by working hard, and applying their own creative ingenuity, they can find ways to overcome the issue of water scarcity and keep agriculture alive and growing in the arid West.

Additional information about the Conservation Generation can be found in NYFC’s report, Conservation Generation: How Young Farmers and Ranchers Are Essential to Tackling Water Scarcity in the Arid West; a survey of 379 young farmers in the arid West and recommendations on how their work can best be supported.

If are interested in learning more about managing agriculture and water in Colorado, check out Managing Agriculture and Water Scarcity in Colorado (and Beyond) , a report released by CFWE, in partnership with CoBank, last year.

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Filed under Agriculture, Climate and Drought, Colorado Foundation for Water Education, Environment, Water conservation, Water Supply

Grand Valley Farmers Participate in Drought Planning Effort

Drought conditions in the Colorado River Basin will continue to be a focus at the Colorado River Water Users Association Annual Conference which runs tomorrow through Friday, Dec. 14-16, 2016 in Las Vegas. The conference will feature expert speakers, panelists and discussions and is regularly attended by key decision makers from Colorado River Basin states. Review the agenda and learn more here.

By Hannah Holm, Coordinator, Hutchins Water Center at Colorado Mesa University

It’s been very dry in Colorado’s mountains this fall.  It’s still early, and the snowpack could catch up to “normal,” but when I flew over those mountains on November 15, they were brown. Just the barest dusting of white covered the highest ridges and north-facing slopes.

This delayed onset of winter has provided a sobering backdrop to ongoing discussions about what to do if the Colorado River Basin slips back into severe drought with Lakes Powell and Mead, the two largest reservoirs in the basin, already half-empty.

Efforts to protect the Colorado River system and those who depend on it

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Water intakes on Lake Mead. Credit: Bureau of Reclamation

If Lake Mead drops too low, farms and cities in the lower basin that have become accustomed to steady water supplies will have to drastically cut back. If Powell drops too low, Glen Canyon Dam will be unable to keep generating power or maintain sufficient releases to honor the 1922 agreement between the states that share the river. No one knows exactly how upstream water users would be affected in that scenario, but if it’s a crisis reaction, it’s unlikely to be pretty. The environment could take a hit as well: low lake levels would make it impossible to conduct periodic high releases designed to mimic historical floods in order to benefit habitat conditions in the Grand Canyon.

In the lower Colorado River Basin, discussions among Arizona, California and Nevada have centered around who will cut their water use, by how much, and at what “trigger” levels in Lake Mead. This is necessary even without an intensified drought, because lake levels keep falling even with normal water deliveries from Lake Powell. The degree of drought just ratchets the urgency up or down.

In the upper Colorado River Basin, which straddles Colorado, Utah, Wyoming and New Mexico, there is no single outlet at the top of the system that can be cranked up or down. Instead, there are thousands of drainages feeding into the Colorado River, with widely dispersed ranches, farms and communities taking sips and gulps along the way, including some sizeable straws pulling water across the Continental Divide to Colorado’s Front Range.

A recent modeling effort coordinated by the Colorado River District concluded that if we were to experience another drought like the one of the early 2000’s, with reservoir levels as low as they are now and without any additional conservation, Lake Powell could essentially be drained in just a few years.

Efforts are underway to figure out how to craft a demand management system that can entice upper basin water users to voluntarily dial back their consumption, and get paid for it, in order to keep Powell from falling to critically low levels.

As it turns out, that’s complicated. For an agricultural demand management system to work for farmers, it needs to provide adequate compensation, not impede long-term operations, have simple paperwork, and not put water rights at risk. For irrigation providers, it needs to pay its own way, be easy to manage, and not put water rights at risk. And for such a system to work for communities, you can’t have large swaths of fields left brown and unkempt, supply dealers left without customers, and farmworkers left jobless.

Grand Valley activities

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Credit: Grand Valley Water Users Association

A pilot project in Western Colorado’s Grand Valley is testing an approach to cutting back agricultural water use that seeks to work for everyone.

The location, just east of the Utah state line, is significant. About half of the water that flows into Lake Powell flows through Colorado’s Grand Valley first, some of it flowing through the river, and some detouring through irrigation ditches and farm fields before returning. Much of the water diverted does not return, of course, instead getting transpired through leaves of alfalfa, corn, or grass, or plumping up peaches and wine grapes.

The Grand Valley Water Users Association (GVWUA), the biggest irrigation provider in the valley, is managing the pilot project to reduce that water consumption. At an October meeting to explain the pilot program to other regional water managers and irrigators, GVWUA manager Mark Harris said that the potential for future water shortages is driving the organization’s participation in the pilot.

For the 2017 irrigation season, GVWUA will conduct the $1 million pilot with funding from the Colorado Water Conservation Board, The Nature Conservancy, and the Water Bank Work Group. The Water Bank Work Group is conducting long-term research on the viability of various demand management options and includes the Colorado River Water Conservation District, the Southwestern Water Conservation District, The Nature Conservancy, Tri-State Generation and Transmission, and the Front Range Water Council.

In 2017, 10 farm operators dispersed across the valley, each with 120 or more acres under irrigated cultivation, will participate in the GVWUA program. There are several options: full fallow, fallow until October, fallow until September, and fallow until August. The option of fallowing until October is popular because it allows establishing a winter wheat crop for the next year. This is particularly important when there isn’t certainty about whether the program will continue the following year. Full fallowing, if continued for multiple years, could provide the opportunity for farmers to transition fields to certified organic production and sell their products for higher prices.

The total reduction in water consumption achieved by the GVWUA pilot is predicted to be 3,200 acre feet: only a drop, but an important first drop to test the system. So far, the project appears to be on course to work well for the participating farmers and the GVWUA. There is adequate compensation, management isn’t too complicated, and water rights are protected. Research indicates that temporary fallowing is more likely to benefit soil fertility than harm it. And in order to ensure that producers renting land won’t be pushed off by landowners choosing program payments over farmers’ rental payments, the program was limited to people who were actively working the land.

Making the program acceptable for the rest of the community isn’t too complicated at this small scale, although some eyebrows may be raised at the odd brown field in the spring. If brought to sufficient scale to meaningfully benefit Lake Powell, however, this would become a more significant consideration.  Harris believes that the program would have to limit participation to no more than 25 percent of the acreage GVWUA irrigates in order to avoid unacceptable impacts to the community.

In the meeting about the GVWUA program, several people voiced concern that agriculture was being expected to shoulder the burden of bringing supply and demand back into balance in the Colorado River Basin. Some cities are, in fact, also participating in programs to cut diversions to protect the reservoirs, and most have made large strides in conservation in recent decades. However, there is still a feeling that they can do more, particularly in the area of integrating land use and water planning.

If snow piles up in the mountains at reasonable levels over the next few years, it will buy time to fine tune and gradually scale up programs like the one GVWUA is testing, as well as experiments underway in other settings and on other crops, like high mountain hay meadows. Bolstering administrative capacity to coordinate a broad suite of such programs and developing legal mechanisms to ensure that conserved water reaches Lake Powell without being intercepted by other users must occur before such programs can be effective at a large scale.

If a moderate amount of conserved water is sent to Lake Powell each year, or retained in upstream reservoirs, it will reduce the chances that more drastic cuts will be needed in any one year—avoiding the deepest impacts to agriculture and communities.

If the mountains keep staying brown late into the fall, however, the upper basin’s demand management efforts will have to accelerate significantly. Under that scenario, it will be harder to keep everyone happy.

 
hannahheadshot1-28-15Hannah Holm is the coordinator and co-founder of the Water Center at Colorado Mesa University, which promotes research, education and dialogue to address the water challenges facing the Upper Colorado River Basin.  Colorado Mesa University is located in Grand Junction, CO.

Hannah previously facilitated the Grand Valley and Lower Gunnison Wise Water Use Council, advocated for stronger drinking water protections with Western Colorado Congress, and served on her local watershed group board in Pennsylvania. In the late 1990’s, Hannah worked for North Carolina General Assembly, where she staffed committees on the Environment, Natural Resources, Sustainable Agriculture and Smart Growth.

Hannah has a joint Master’s degree in Community & Regional Planning and Latin American Studies from the University of Texas at Austin and a Bachelor’s degree in Anthropology from Macalester College in St. Paul, MN.

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Filed under Agriculture, Climate and Drought, Colorado River, Uncategorized

Expanding the Role of Reclaimed Water

One of the main resources needed by any garden, including Denver Urban Gardens‘ (DUG) community gardens, is water. Since 1985, DUG has been working in the Denver Metro area to create sustainable, food-producing community gardens, and today operates more than 155 gardens, with 30 of those located on the grounds of Denver Public Schools (DPS).

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Photo Credit: Denver Urban Gardens

“School community gardens connect students, parents, teachers and the larger neighborhood community,” says Shannon Spurlock, director of public affairs and policy for DUG. “Our goal is to support the farm to school movement that introduces students to fresh, healthy, food choices that will lead them to make good food choices in the future.”

In the interest of sustainability, DPS has a long-term goal of switching all of their outdoor irrigation systems over to reclaimed water; however, an increase in the use of reclaimed water for irrigation could cause the number of school gardens to dwindle.

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Photo Credit: Denver Urban Gardens

Spurlock continues, “When a school’s irrigation system switches to reclaimed water, the school can no longer run a garden.” This limitation is due to Regulation 84, a public health policy that controls the ways that reclaimed water can be used, in order to protect public health and safety in Colorado. One of the ordinances that make up Regulation 84 states that reclaimed water cannot be used on crops meant for human consumption, which includes the school gardens run by DUG.

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Reclaimed Water

In Colorado, nonpotable reuse water—or reclaimed domestic wastewater that has received secondary treatment by wastewater treatment works, as well as additional treatment needed to meet standards for approved uses—is restricted to landscaping irrigation and some commercial and industrial uses. Key issues that concern the Colorado Department of Public Health and Environment (CDPHE) include the potential for bacterial and viral pathogen growth in storage and distribution systems, the development of antibiotic resistant genes and bacteria (ARG/ARB) that may be found in reclaimed water and having no clear treatment options, and the accumulation of salt due to reuse

DUG, Denver Water and WateReuse Colorado have been active proponents of amending Regulation 84 in favor of crop irrigation, as a way to make further use of a nonrenewable resource and extend the Denver Metro area water supply. DUG views the successful use of reclaimed water in other states, such as California, as an opportunity to safely increase the role of reclaimed water to agricultural irrigation, including community gardens.

“The use of reclaimed water on crops is not new,” Spurlock says. “We are benefiting from the technology and knowledge of others when it comes to food safety and security.”

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Reclaimed Water Greenhouse              Photo Credit: USDA

In California, crops have been irrigated with reclaimed water for 50 years. California Water Recycling Criteria allows for 43 specific uses of reclaimed water and encompasses the irrigation of all types of food crops, including those meant for human consumption. Different water quality requirements are necessary depending on how the final product will be consumed. Having a variety of treatment options supports water safety and reduces the potential for pathogens and ARG/ARB to be found in the water.

The California Ag Water Stewardship Initiative (CAWSI) addresses the issue of increased salt in reclaimed water, stressing the importance of farmers having access to water quality data that will allow them to adjust fertilization and irrigation practices accordingly for the most effective use of reclaimed water on crops.

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Photo Credit: USDA

California’s success using reclaimed water for irrigation gives DUG cause to be hopeful about the future of expanded reclaimed water use in Colorado. Discussions between CDPHE and proponents of increased reclaimed water usage began in spring 2016 and are slated to continue to determine whether or not the amendment process will continue, and to ensure that public health protection remains a priority if Regulation 84 is amended.

By 2050, Colorado’s population is projected to surge from 5.4 million to 10 million people. This rate of growth places a strain on the state’s already stressed water supply, widening the gap between supply and demand, and leaving water providers searching for ways to stretch a limited resource. One possible way to meet the ever-increasing demand for water is through the use of reclaimed water, and should Regulation 84 be amended in the future, its effect may stretch beyond watering a neighborhood garden.

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Photo Courtesy of Denver Urban Gardens

“Food connects our students to the land, our urban areas to rural farming, and gives everyone an opportunity to experience fresher, healthier, food that they might not experience, otherwise,” Spurlock says. “Families take what they learn in a school garden and start gardens in their own home. I have seen how growing food can have a positive influence on lives, and by amending Regulation 84 and incorporating reclaimed water into our daily lives, we can continue to have an impact.”

Watch for related coverage, including a story about water reuse and public health, in the upcoming issue of Headwaters magazine, focused on public health and water, which will hit mailboxes in early December. Not a Headwaters subscriber? Visit yourwatercolorado.org in December for the digital version. Headwaters is the flagship publication of the Colorado Foundation for Water Education and covers current events, trends and opportunities in Colorado water.

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Accurately Estimating Evapotranspiration: The Third Colorado ET Workshop

By Tom Trout, USDA-ARS-Water Management Research

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Tom Trout checking out the CoAgMet weather station instrumentation. Credit: Peggy Greb

Water rights transfers in Colorado are based on consumptive use. A city or company that purchases water from a farmer can only use the amount of water that the farmer has historically consumed—that is, the water that actually evaporated and transpired from the crop and soil. Thus, they must estimate the evapotranspiration, or ET, for the fields that had been irrigated. The method to estimate ET commonly used in Colorado is an old method developed over 50 years ago called the Blaney-Criddle method. The method is based only on temperature and is simple, but not very accurate.

Much more accurate ET calculation methods are now available. ET weather station networks in Colorado—Colorado Agricultural Meteorological Network (CoAgMet), and Northern Water’s networkhave been collecting detailed weather data for over 20 years that can be used to calculate reference ET using globally-recognized standardized methods. Satellites have been collecting images of farm crops for over 30 years. These technologies can be combined to improve ET estimates over the past month or season or several years.

Learn about these newer technologies and the advantages and disadvantages compared to current methods at the Third Colorado ET Workshop. The workshop will present ET estimation methods and the information required to use them, including weather and satellite data. Presenters will also describe the latest research in ET estimation for both well-irrigated and deficit-irrigated crops. They will discuss how these methods could be used for more accurate and standardized consumptive use calculations for both permanent water transfers and alternative temporary transfers.

The Third Colorado ET Workshop will be held in Fort Collins on October 13, 2016. Workshop organizers include USDA-Agricultural Research Service, Colorado State University, Colorado Division of Water Resources, and Colorado Water Conservation Board.

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The workshop is part of the Ninth International Conference on Irrigation and Drainage organized by the U.S. Committee on Irrigation and Drainage (USCID) taking place October 11-14 at the Fort Collins Hilton. The theme of the USCID conference is:

Improving Irrigation Water Management—Latest Methods in Evapotranspiration and Supporting Technologies

The conference will include many presentations on the latest ET research. The recently published ASCE Manual “Evaporation, Evapotranspiration, and Irrigation Water Requirements” will be introduced at the conference. Participants can register for the whole conference, or just the Thursday Colorado ET Workshop. Learn more and register here.

Read more about Tom Trout’s cover_webrecent work in “The Ever Evolving Farmer” in the Fall 2012 issue of Headwaters magazine.

 

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