Click here to download the report. Here’s the abstract:
We quantify long-run adaptation of U.S. corn and soybean yields to changes in temperature and precipitation over 1951–2017. Results show that although the two crops became more heat- and drought-tolerant, their productivity under normal temperature and precipitation conditions decreased. Over 1951–2017, heat- and drought-tolerance increased corn and soybean yields by 33% and 20%, whereas maladaptation to normal conditions reduced yields by 41% and 87%, respectively, with large spatial variations in effects. Changes in climate are projected to reduce average corn and soybean yields by 39–68% and 86–92%, respectively, by 2050 relative to 2013–2017 depending on the warming scenario. After incorporating estimated effects of climate-neutral technological advances, the net change in yield ranges from (−)13 to 62% for corn and (−)57 to (−)26% for soybeans in 2050 relative to 2013–2017. Our analysis uncovers the inherent trade-offs and limitations of existing approaches to crop adaptation.
Denver Water is planning to expand Gross Reservoir in Boulder County. The additional storage capacity will create more balance in the utility’s storage and give water planners more flexibility in their operational strategy. Photo credit: Denver Water.
Denver Water today [July 14, 2021] filed a lawsuit in U.S. District Court against Boulder County, asserting the county is overreaching its authority and jeopardizing a federally ordered reservoir expansion critical to a safe and secure water supply for one quarter of the state’s population while risking long-planned benefits for the West Slope environment.
BACKGROUND
For nearly two decades, Denver Water has conducted an exhaustive and comprehensive planning and permitting process at the direction and oversight of six federal and state regulatory agencies. That process culminated last year in a final order to commence expansion of Gross Reservoir from the Federal Energy Regulatory Commission, which has final authority over the expansion project because Gross Reservoir occupies federal lands specifically designated for hydropower production.
For years, Denver Water has also attempted good faith efforts to work with Boulder County to secure county permits, including through two attempts at an intergovernmental agreement, robust engagement with county staff and neighbors, and participation in a local land-use review known as the “1041 process.” Unfortunately, Boulder County has been unreceptive and is using the 1041 process to frustrate the project, extending and delaying its review to the point that it is now placing the entire project at risk.
DENVER WATER STATEMENT ON NEED FOR THE PROJECT
It is hard to overstate the importance of the expansion of Gross Reservoir to the future of the Denver region. It will offer crucial protection to the utility’s water supplies from the urgent threat of catastrophic wildfire and prolonged drought — the same forces that nearly 20 years ago combined to threaten Denver Water’s ability to ensure drinking water to its customers.
This risk to clean water supplies is even higher today, in an era of rapid climate change and increasing periods of extreme weather. Last year’s record wildfire fire season, which generated the three largest forest fires in Colorado history, only just missed triggering major impacts to Denver Water’s supplies. Water providers to the north haven’t been as lucky, unable to treat some supplies running black and brown with ash produced by the Cameron Peak fire. Denver Water must act now to mitigate these risks.
The Gross Reservoir expansion conforms in every way to benchmarks in Colorado’s Water Plan, a plan developed through statewide and bottom-up guidance from eight major river basins over two years and published in 2015. That plan calls for increasing the capacity of existing reservoirs as a key element in creating 400,000 acre-feet of additional storage in the state by 2050.
The State of Colorado, in comments to the U.S. Army Corps of Engineers, expressed its support for the Gross Reservoir expansion and has identified it specifically as fitting within the kind of project defined as necessary in Colorado’s Water Plan: “A significant portion of Colorado’s future needs will be met with the implementation of projects and planning processes that the local water providers are currently pursuing, including the Moffat Collection System Project” (aka Gross Reservoir expansion).
The reservoir expansion also addresses the significant need for additional supplies in the metro region, as referenced in the Water Plan’s 2019 technical update. That update projected metro Denver demand will increase by 134,000 acre-feet to 280,000 acre-feet by 2050 against a 2015 baseline and the area likely will experience a supply shortfall, even accounting for the Gross Reservoir expansion and other water projects, a drop in per-capita use, and further conservation and reuse.
DENVER WATER STATEMENT ON DEVELOPMENT OF THE PROJECT
Denver Water’s diligent and earnest work to build partnerships across the Continental Divide, conduct significant and ongoing environmental mitigation for the project and work closely with regulators since the early 2000s has earned the project the support of major environmental groups, Grand County and each of the last five governors of Colorado. The Colorado Department of Public Health and Environment concluded the project would result in net water quality improvement on both sides of the Continental Divide.
The dam, when built in the 1950s, was designed to be raised. In the 1980s, amid discussion of the Two Forks project southwest of Denver (later vetoed by the EPA) a coalition of environmental groups recommended the expansion of Gross Reservoir as a viable, environmentally stable project. “We feel that additional capacity at Gross Reservoir is an environmentally acceptable and cost-effective way of increasing the overall yield of the system,” the coalition wrote. It included representatives of the Sierra Club, the Environmental Defense Fund and Trout Unlimited, among several other groups.
Denver Water also worked industriously with local governments and citizen groups on the West Slope to address the impacts that putting more water in an expanded Gross Reservoir would have on streams in Grand County. Those talks, often intense, and spanning half a decade, resulted in the Colorado River Cooperative Agreement in 2013, an unprecedented cooperative effort involving 18 signatories and 40 partner organizations that began a new era of collaboration and conflict-resolution between Denver Water and the West Slope.
Expanding Gross Reservoir locks in a key component to that agreement: Denver Water would place a geographic limit on its service area, putting to rest fears the utility would continue to expand its reach to an ever-sprawling suburban ring. The utility also agreed to several measures that would provide more water to West Slope rivers, towns and ski areas and invest in improvements to aquatic habitat. The landmark concord also affirmed that with the Gross Reservoir expansion, Denver Water would benefit from more flexibility in its system, and it would use that flexibility to address stream flow and stream temperature concerns more nimbly and readily in Grand County.
Additionally, Denver Water worked with the cities of Boulder and Lafayette to establish an environmental pool in Gross Reservoir to provide additional water in South Boulder Creek during low-flow periods. Water in that pool would also supplement supplies for those two cities. Many of these commitments, however, depend on the project going forward and are therefore in jeopardy through Boulder County’s actions.
As planning for the expansion moved ahead, the utility undertook a proactive strategy to reduce demand. It deployed a water recycling facility to reduce its dependence on West Slope water supplies, embarked on a conservation program renown nationally for its success — cutting per capita water use by 22% between 2007 and 2016 — and has now undertaken direct efforts at water efficiency that pinpoint savings opportunities at the individual customer level. These are only a sample: The utility remains committed to innovation to drive further savings and expand water reuse as a core part of its strategy, work that will continue to be essential even with an increase in storage at Gross Reservoir.
In short, the effort to build civic and regulatory support for the Gross Reservoir expansion has been persistent, inspired and earnest. The future of the region, its access to clean, safe drinking water, protection of its urban tree canopy and environment, and its economic development rest in large part on the ability of Denver Water to protect water supplies from emerging threats, develop a climate-resilient system and remain prepared for the demands that will result from continued growth within its service area in metro Denver.
DENVER WATER STATEMENT ON BOULDER COUNTY’S PROCESS
Boulder County is endangering the project through delays, repeated and expanding requests for information — information demands that duplicate the already completed federal permitting process in which Boulder County participated — the potential for months of additional hearings and the fact that two of the county’s three commissioners have already publicly stated their opposition to, and desire to stop, the expansion project.
Further, the county’s land use director informed Denver Water on June 29 that the utility — despite over nine months of diligent and painstaking work to respond to Boulder County’s ever-expanding queries — failed to provide sufficient information to county agencies about the project, setting the project up for failure and rendering further involvement with the 1041 process futile.
These actions also put engineering and construction deadlines at risk, threaten to disrupt FERC-ordered timelines and risk other permits and actions necessary for successful completion of the project. A project of this size and complexity requires extensive preplanning, substantial resources and a highly skilled design and construction team. Delays resulting from Boulder County’s refusal to timely process the 1041 application add substantial costs and cause permitting, procurement and logistical issues that seriously disrupt Denver Water’s ability to execute the project.
In summary, the actions of a single local jurisdiction, Boulder County, threaten to derail and undermine a federally permitted and state supported project vital to a safe and secure water supply for one-quarter of Colorado’s population. This presents an unacceptable risk to a critical project spanning nearly 20 years and involving intensive review by environmental agencies at the federal and state levels and the engagement of dozens of organizations and communities across the metro area and the West Slope.
For that reason, Denver Water must seek relief in federal court. The complaint further details Denver Water’s attempts to work with Boulder County, the reasons that federal law preempts Boulder County’s claimed authority over the FERC-licensed expansion project, and the basis for Denver Water’s request that the court prevent Boulder County from further delaying and derailing the project.
This Parshall flume, which was installed in the Yampa River basin in 2020 and is shown in this August 2020 photo, replaced the old, rusty device in the background. State engineers are developing rules for measuring devices, which would apply to the entire Western Slope. CREDIT: HEATHER SACKETT/ASPEN JOURNALISM
State officials are preparing for a future with less water by developing rules and guidance for water users to measure how much they are taking from streams.
State Engineer with the Colorado Division of Water Resources Kevin Rein is planning a rule-making process on measurement devices that includes stakeholder input. Although state engineers in each water division have the authority to enforce the requirement of measurement devices, Rein said drafting more formal rules through an administrative rule-making process, instead of an ad hoc push like in the Yampa River basin, would affirm that authority. Rules would also include specific technical guidance on the best types of flumes, weirs and meters to use for different types of diversions.
“The idea about rule-making is that we would have consistent guidance across the basin, developed through a formal process,” Rein said. “One thing I’ve found is that when you have stakeholder involvement in the development, then you have stakeholder buy-in during the implementation.”
Sprinklers and a ditch irrigate this section of Crystal River Ranch outside of Carbondale on Wednesday. According to state officials, about 95% of diversions in the Crystal and Roaring Fork River basins already have measuring devices. CREDIT: HEATHER SACKETT/ASPEN JOURNALISM
Yampa/White/Green river basin
Division 6 Engineer Erin Light is still taking a lenient stance with water users in the White and Green river basins while the measurement rules are developed. In fall 2019, Light ordered nearly 500 water users in the Yampa River basin to install measuring devices to record their water use and initially received some push-back from agricultural water users unaccustomed to measuring their diversions.
In March 2020, Light issued notices to water users in the White and Green, but decided to delay sending formal orders after the COVID-19 pandemic disrupted the economy. Orders are still on pause while Rein’s office develops the measurement rules, which would apply across the Western Slope.
“It made more sense to wait for the measurement rules to at least get started, maybe not necessarily get completed, but allow Kevin to get out and start doing the stakeholder meetings and encourage these structures to be installed without orders,” Light said.
Compliance is gradually increasing across the basin, but at a slower pace than Light would like. In January 2020, 49% of diversions in the Yampa River basin did not have a measuring device; as of April 2021, 42% were still without one. White River basin compliance has improved from 83% without a measuring device to 68% over the same time period; water users in the Green have gone from 69% to 49%. As a whole, Division 6 has gone from 55% of diversions without measuring devices to 46%.
“I would have hoped that we would have had more compliance at this point,” Light said. “I look at those numbers and think we still have some work in front of us and how are we going to accomplish our goal, which is to assure that all of these structures that we maintain records on have operable headgates and measuring devices.”
In some basins on the Western Slope, nearly all diversions already have measuring devices. For example, in the Roaring Fork and Crystal river basins, about 95% of the structures have devices, according to Colorado Department of Natural Resources Communications Director Chris Arend. That’s because there has traditionally been more demand and competition for water in these basins, he said.
Scott Hummer, water commissioner for District 58 in the Yampa River basin, checks out a recently installed Parshall flume on an irrigation ditch in this August 2020 photo. Compliance with measuring device requirements has been moving more slowly than state engineers would like. CREDIT: HEATHER SACKETT/ASPEN JOURNALISM
Water shortages drive measurement push
The push for Western Slope diverters to measure their water use comes down to impending water shortages. Division 6, in sparsely populated northwest Colorado, has traditionally enjoyed abundant water and few demands, but as climate change tightens its grip on the West, there is less water to go around. Calls by senior water users have gone from unheard of to increasingly common in just the last few years.
“We definitely have systems on call that have never been on call,” Light said of current conditions in the Yampa.
A call occurs when a senior water rights holder is not getting their full amount they are entitled to. They place a call with state engineers, who shut off more junior water rights users so the senior user can get their full amount. Under Colorado’s prior appropriation system, the oldest water rights have first use of the river.
“If you don’t have a measuring device during a call, we are shutting you off, period,” Light said.
As the threat of a Colorado River Compact call and the possibility of a state demand-management program grow, state officials say the need to measure water use grows, too.
A compact call could occur if the upper-basin states — Colorado, Utah, Wyoming and New Mexico — were not able to deliver the 75 million acre-feet of water over 10 years to the lower basin states — California, Arizona and Nevada — as required by the 1922 compact. Colorado water managers desperately want to avoid this scenario, in part because it could trigger mandatory cutbacks for water users.
If a compact call were to play out, measuring devices would be crucial, because as Rein says, you can’t administer what you can’t measure.
“We need to better measure what has been diverted, so having measurement rules and therefore measuring devices in place will be critical to prepare for and implement compact administration, should it happen,” he said.
The state is also currently exploring a potential demand management program, which would temporarily pay irrigators to not irrigate and leave more water in the river. The goal would be to boost water levels in Lake Powell and avoid a compact call. But in order to participate in the voluntary program, feasibility of which is still being evaluated, irrigators need to first measure their water diversions.
“We would have to know how much they were using in the years before, before we can give them credit for not using it,” Rein said.
Sprinklers irrigate this section of Crystal River Ranch outside of Carbondale on July 14, 2021. State engineers are creating rules that will lay out guidelines for water users to install measurement devices for their diversions from the river. CREDIT: HEATHER SACKETT/ASPEN JOURNALISM
Low interest in grant funding
One of the reasons Light originally paused enforcing the measurement device requirement in the White River basin was to give conservancy districts time to secure grant money to help irrigators pay for the potentially expensive infrastructure. But there was not much interest from water users in getting grant money, according to Callie Hendrickson, executive director of the White River & Douglas Creek Conservation Districts.
“We did not proceed with (securing grants),” she said. “We didn’t hear from very many people that they were seeking funding.”
The story was similar on the Yampa. The Upper Yampa Water Conservancy District had a $200,000 pot of money — half of it state grant money and half from the district — to reimburse water users for installing measuring devices. Irrigators can get 50% of their costs covered, up to $5,000 through the first tier of the grant program. According to Public Information and External Affairs Manager Holly Kirkpatrick, despite a very simple application process, the program has doled out just under $40,000 so far for about 20 projects.
“I had certainly hoped to have more interest in the first year of the program,” she said.
As Rein plans for webinars and meetings with water users later this summer and fall, the situation in the Colorado River basin grows more dire. The Bureau of Reclamation this week began emergency releases from Upper Basin reservoirs to prop up levels in Lake Powell to try to maintain the ability to produce hydroelectric power at Glen Canyon Dam.
“I recognize the value in having measurement rules as soon as possible because, yes, they would be extremely helpful if we need to take measures toward compact administration,” Rein said. “Having more data sooner rather than later is important.”
Aspen Journalism covers waters and rivers in collaboration with The Aspen Times. For more, go to http://www.aspenjournalism.org.
