By Jim Malewitz, Stateline Staff Writer:

Threatened by another summer of crop-shriveling drought, Kansans are watching a bold experiment unfold in Sheridan County, population 2,556, a sliver of the states northwest corner. On lands dominated by agriculture, locals have agreed to across-the-board cuts to water use.

The state of Kansas didnt order the cuts, nor did a regional entity. Rather, at a time when states and locals are jockeying for water, stakeholders in the 100 square-mile high priority (meaning particularly parched) zone of Northwest Kansas Groundwater District 4 reached a consensus to reduce groundwater pumping by 20 percent over the next five years. They are gambling on short-term wants for a longer-term need to preserve the aquifer their lives depend upon.

Were doing it because we think its right, said Wayne Bossert, the districts manager. We have high hopes for it.

Sheridans plan is just one of many major efforts to fend off a slow-moving disaster with national implications: The High Plains Aquifer, which feeds some of the worlds most productive croplands, is running dry.

The aquifer, also called the Ogallala, is one of the worlds largest underground sources of freshwater. It stretches 174,000 square miles through the middle of the country from South Dakota to Northwest Texas, touching parts of Kansas and five other states, watering more than one-quarter of all irrigated acreage in the U.S. and some of worlds largest grain cattle feedlots. The Ogallala also provides drinking water to four of every five people living above it.

For decades, farmers and others have been slurping up groundwater far faster than nature can recharge it.

Since Americans first began to seriously irrigate the Great Plains, beginning in the 1940s, water levels across most of the Ogallala have fallen at least five feet, according to the U.S. Geological Survey . Almost one-fifth of the area has dropped at least 25 feet, while 11 percent has lost 50 feet or more. In some of the worst-off areas of Kansas and Texas, the water table has declined as much as 200 feet. The most recent drought has compounded the problem, drying up riverbeds and forcing farmers to rely even more heavily on groundwater.

It can take as long as 6,000 years for water to percolate through the thick layers of earth and rock separating surface from aquifer. In most areas, pumping the water is akin to mining iron or copper; once removed from the ground, the resource doesnt come back.

Its kind of a ticking time bomb, and we kind of know it, said Kent Askren, a water specialist with the Kansas Farm Bureau. Were trying to squeeze every ounce of every drop we apply.

Spurred to Action
Researchers and officials have been aware of the Ogallalas condition for decades, but the drought gripping the region has put it, and other water issues, into sharp focus.

Groundwater districts are looking for ways to slash water use, and states aim to incentivize and support those decisions.

• In 2012, the Kansas legislature recently passed a slew of new water laws , including one making Sheridans plan possible. Its now examining whether to tweak those policies.
• In Nebraska, lawmakers are considering spending3 million for a task force to study the states water needs and recommend projects to meet conservation goals.
• In rapidly growing Texas, the legislature is considering investing some2 billion into building reservoirs and other infrastructure recommended in the states long-underfunded water plan .

If the Ogallala dries up? Folks in the region dont mince words. That would be devastating, said Nebraska state Sen. Tom Carlson, who has proposed the task force. We cant let it happen. We wont let it happen.

The implications are profound, said Kansas Gov. Sam Brownback in an interview. It is time to act.

Tragedy of the Commons
For more than two decades, thats what Brownback has been trying to do first as the states agriculture secretary, where he learned about the problem in the late 1980s, then as a U.S. senator and now as governor in the nations breadbasket. But conserving such a vast resource is as difficult as it is important, particularly as Brownback looks to expand Kansas economy, the straightforward goal of any state executive.

Youve got to reduce your water use, but youve got to keep your economic activity flat to growing, Brownback said. People cant live there unless theres economic activity.

But it has been rapid growth more crops, cattle, industry and people that has so stressed the Ogallala over the decades. Whats more, the expansion of oil and gas drilling throughout the region, spurred by the advent of water-intensive hydraulic fracturing, has brought new challenges. The drilling process, which can use up millions of gallons of chemical-laced water per well, has stirred angst among some farmers. They worry about increased competition and the reality that fracked water can rarely be reused.

Natural resource experts have described the issue as a tragedy, as self-interested water rights holders race to shore up short-term supplies, even if it means eroding the resource in the long term.

The question for policymakers is how to break that cycle. Could states reach across their borders to conserve the shared resource? Not likely, experts say. State water laws differ greatly, complicating such an effort. States have historically worked together to share surface water, setting compacts on rivers such as the Colorado, Republican or Rio Grande (Compact conditions often spark legal feuds, however. Current fights between Nebraska and Kansas , Texas and Oklahoma and Texas and New Mexico have reached or are approaching the U.S. Supreme Court). But groundwater is a different story. Its harder to measure cross-state impacts of withdrawals, so it may not make sense to set regional limits.

On groundwater, there doesnt seem to be much interest in cooperating, said Edella Schlager, an expert in natural resource policy at the University of Arizona. Its really hard.

Thats particularly true around the Ogallala. Its not simply an underground ocean, where sucking up too much water in Wyoming will lower the water table in Texas. Its a geologic formation, with some areas deeper than others, or covered by thicker layers of earth. Though parts of Nebraska are struggling, for instance, its wide and spongy Sandhills region is particularly absorbent, leading to quicker recharge and less dire conditions.

Looking Local
Most western states have granted considerable controls to local groundwater districts. The states job largely involves incentivizing and supporting local conservation efforts.

Last year, Brownback pushed several new groundwater policies through the legislature, including amending the states use it or lose it law, which critics said encouraged farmers and others to waste water so they could maintain access to it. He also expanded water-banking markets, allowing water rights holders to sell excess resources so its worth something if you dont use it all up, Brownback said.

Brownbacks most promising effort, experts say, was creating a new way for locals to decide their water future. The policy, enacted last year, allows districts to create what are called local enhanced management areas (LEMAs) that would hash out conservation goals and the means to achieve them all at the grassroots level.

A Difficult Task
The Ogallalas future may ultimately come down to the collective actions of a checkerboard of tiny jurisdictions like Sheridan, the guinea pig in Brownbacks policy.

Youre only limited by your imagination, Bossert, the district manager in northwest Kansas, said of the policy. In the past, the state was more intimately involved in those plans. Now, it approves or denies a plan, but can only suggest, but not require, any tweaks.

Some compare the system to one in Texas, which encourages districts to set concrete targets for how much water they want to leave in the aquifer in the coming decades. Once the goals are set, the state uses a matrix to show districts how to achieve those goals and may chip in other help.

In Kansas, the states biggest role is providing that help, Brownback said, by providing new technology and expertise. That includes pushing farmers to shift toward high value crops that use less water such as milo, also known as sorghum. The governor said he is talking to Israel about importing more efficient irrigation systems.

Bossert said his district has already benefited. Once someone takes that leap of faith, and crafts that new, shiny thing, youre going to get all sorts of help, he said.

But Sheridans task hasnt been easy. Though its plan was approved just months after the LEMA bill passed, the area had spent years debating how to reduce water use. And the wider district still has a long way to go. Sheridan is just one of six high priority areas in the district. The others, perhaps waiting to see what happens there, dont yet have a plan. Some fear that worse-off areas could run out of groundwater before theyve decided how to save it.

Thats the case in parts of Texas, as the legislature considers funding its water plan. Gary Walker, a state legislator turned groundwater district manager in northwest Texas, said building more reservoirs would be a wise move. But construction could take years, or even decades time those living above Texas slice of the Ogallala may not have, forcing farmers to abandon irrigation altogether.

The aquifer he said, limits itself.

This piece comes to us courtesy of Stateline . Stateline is a nonpartisan, nonprofit news service of the Pew Charitable Trusts that provides daily reporting and analysis on trends in state policy.