Mining Water for Irrigation
Farm History Portal
1930's
- Introduction
- Farm Life
- Accidents & Illnesses
- Building the Lines
- Bringing Electricity
- Changing Farm Work
- Changing Rural Homes
- Chores
- Community Churches
- Crime
- Dancing
- Dating
- Diversity In Religion
- Family Time
- Feeding The Family
- Flour Sack Clothes
- Foodways
- Going To School
- Gypsies
- Having Fun
- Impact of the REA
- Indoor Plumbing
- Jazz
- Migration Out
- Migration In
- Minorities
- Movies
- Prohibition Of Alcohol
- Radio
- School Days
- THE KKK
- School Programs
- Surviving The Weather
- Who Lived In York Co.?
- Machines
- Crops
- Making Money
- Pests
- Water
- World Events
1940's
- Introduction
- Farm Life
- Building Bombs & Planes
- Canteens Greet Gis
- Changes In Eating Habits
- Civil Rights For Minorities
- Conscientious Objectors
- Drive-Ins
- EDUCATION
- Enlistments & The Draft
- Internment In America
- K-12 & Consolidation
- Land Grant Universities
- Local Sports
- Minorities On Base
- More Rights For Women
- Nisei Invade … Nebraska
- Normal Life & War Brides
- Pop Culture At War
- Postwar Food & Fun
- Rationing
- REA Promise Fulfilled
- Rural Bases
- Rural Medicine
- Strains on Rural Housing
- The Blizzard Of ’49
- The GI Bill
- The Home Front
- TV Turns On
- War Ends!
- War Stories
- Fertilizing
- Machines
- A Jeep Is A Jeep, Right?
- Allis Chalmers Tractors
- Case Tractors
- Cultivators
- Fixing Machinery
- Ford-Ferguson Tractors
- Horses Lose Their Jobs
- John Deere Tractors
- Haying Equipment
- Hydraulics
- IH Farmall Tractors
- Planters
- Postwar Technology
- REA In The Field & Barn
- Self-Propelled Combines
- Surplus Everywhere
- Tractor Innovations
- Vise Grip
- Making Money
- Crops
- Water
- Pests
1950's & 1960's
- Introduction
- Crops
- Farm Life
- Harvest Technology
- Machines
- Allis-Chalmers Tractors
- Corn Combines
- Cotton Harvesting
- Ford Tractors
- From Barns To Behlen Buildings
- Harvesting Wheat
- J. I. Case Tractors
- John Deere Tractors
- Massey-Harris becomes Massey-ferguson
- Minimum Tillage Changes Planters & Cultivators
- Other Tractors In The 1950s And 60s
- Tractor Pulling
- Tractors
- Making Money
- Ag Lobbies Washington
- Agribusiness
- Food For Peace
- Farm Families Going To The City
- Farmers Teach Wall Street Futures
- Farming For The Government
- Food Stamps
- IBP & Boxed Beef
- Ike’s Farm Programs
- JFK’s Farm Programs
- Johnson’s Farm Programs
- Sales Day
- Supermarkets Dominate
- The Rise & Fall Of The Omaha Stockyards
- Truman’s Farm Program
- Planter Technology
- The Golden Age Of Pesticides
- World Events
- Water
- Center Pivots Take Over
- Connections Between Surface And Groundwater
- Exporting Water
- First Pivots Installed
- How Pivots Work
- Making Circles Into Squares
- Nebraska’s Unique Natural Resource Districts
- Other Center Pivot Innovators
- Robert Daugherty & Valmont
- State To State Water Agreements
- The 1950s Worldwide Boom In Irrigation
- Valmont’s Center Pivot Patent Runs Out
- Water Wars
1970's - Today
- Farming in the 70s to Today
- Farm Life
- Crops
- Making Money
- Machines
- Partial Bibliography
- Pests & Weeds
- Planter Technology
- Water
- World Events
The Ogallala Aquifer is one of the world’s most remarkable geological structures. It supplies irrigation water to large areas of the Great Plains, and the experience here can be an example of other groundwater irrigation areas.
The Ogallala is enormous with over three billion acre-feet of water below 174,000 square miles in eight states – Nebraska, Colorado, Kansas, Oklahoma, Texas, New Mexico, South Dakota and Wyoming. Three billion acre-feet equals around 977,553,000,000,000 gallons of water. That’s a huge amount of water trapped in saturated gravel beds that start 50 to 300 feet below the surface of the land and are 150 to 300 feet thick. The water in the Ogallala Aquifer actually travels slowly through the gravel layers, moving two to three feet a day, generally to the southeast until it runs into other bedrock layers.
In places, like the Sandhills of Nebraska, the Ogallala almost reaches the surface of the land, directly feeding the root systems of grasses in what are known as sub-irrigated meadows. Here the sand is porous and what little rain there is can move quickly into the aquifer. In other places, this natural “recharge” of the groundwater happens slowly, if at all.
So most of the water in the Ogallala is ancient, injected into the gravel layers by massive flows of water from Rocky Mountain glaciers up to 25,000 years ago. About 10,000 years ago the flows into the Ogallala stopped, possibly because the Pecos and Rio Grande River systems developed and carried off the glacial water. Geologists refer to the Ogallala’s water as “fossil water.”
At least since 1950, farmers and – to a much lesser extent – city dwellers on the Great Plains have been mining this fossil water, extracting it from the Earth in much the same way we mine minerals or gold. We have been drawing out much more water than can ever be replaced.
It’s estimated that since 1950, farmers have installed deep irrigation wells and pulled up one billion acre-feet of water from the Ogallala. Some of that is used by the plants, stored in their seeds and then hauled off when the farmer harvests the crop and ships it around the world. Some of that water is transpired by the plant, or evaporates off the land and winds up as rain thousands of miles away. Some may run off the land, even though it’s not supposed to. Some may percolate down through the soil and rock layers to reach the aquifer again.
But recharge rates in the Ogallala region are typically measured in inches a year, while the dropping water table surrounding an irrigation well is measured in feet.
In parts of Texas, the water table in the Ogallala has dropped more than 230 feet. Some farmers in Texas have had to let their expensive irrigation pumps sit idle for years at a time. In parts of Nebraska, Natural Resource Districts have begun requiring irrigators to put meters on their wells, and keep track of how much water they’re using. Some districts have come close to banning drilling of any new irrigation wells.
There are only a few regions of the Ogallala where water tables have risen. The largest rise was in Nebraska and totaled 84 feet.
In most places, the water table has dropped. On average, over the entire 111.6 million acre range of the aquifer, the drop has been 14 feet. That’s significant because, even though this is one of the most highly irrigated farming areas in the world, irrigated acres overlay only 14 percent of the area of the aquifer.
Mark Kaliff (left) is one of those farmers in central Nebraska who has begun metering his wells and monitoring how much water is actually in the soil before turning the irrigation on. The extended family farm operation he’s a part of has over 100 center pivot systems. “Irrigation in Nebraska is very important, very critical to this area,” Mark asserts. “We do need to monitor the amount that we use and try to use it most efficiently.”
Todd Sneller (right) says that farmers, at least in Nebraska, understand that they are mining a finite resource. “We, historically, have mined water,” Todd says. “Water truly is valuable… Water stewardship has been something that, in Nebraska, we’ve done a good job of in the past. There’s a requirement to do a good job now.”
Dave Vetter (left) put monitors on his irrigation wells in 1976, started testing soil a few years later and installed the newest evapotranspiration gauges recently. “We’ve been trying to find ways to conserve and reduce water consumption,” Dave says. “We’ve put 60 acres of subsurface drip [irrigation] in which reduces the water usage even more.”
There seems to be a general acknowledgment that farmers are mining the underground aquifers, and individual farmers are experimenting with innovative ways to manage their water use and still produce a profit.
Written by Bill Ganzel, the Ganzel Group. First published in 2009. A partial bibliography of sources is here.
Start exploring now by clicking on one of these seven sections.
Farm Life / Water / Crops / Making Money / Machines / Pests & Weeds / World Events