In 2003, Colorado was found to be in violation of the Arkansas River Compact, which was approved by Congress and signed by President Harry S. Truman in 1948. This resulted in a 13-year lawsuit after which Colorado was required to pay Kansas $34.6 million in damages, $1.1 million in court costs, and additional water.
Under the compact, Colorado was allowed to develop the Arkansas River Basin (e.g., by constructing dams or reservoirs) as long as its development did not “materially deplete” the flows apportioned to each state. However, Colorado subsequently authorized at least 2,000 new wells, which - in violation of the compact - increased the state’s total pumping of water from the river.
To avoid another lawsuit, rules have been put in place and Kansas is involved in developing the rules for water usage for Colorado farmers and must be compensated for overuse of the water in the Arkansas River. A new rule, Rule 10 Compliance Plan, is said to be better than the previous rule. But farmers are wondering about the fairness of it all.
Under Rule 10 farmers who make certain improvements, such as lining ditches and laterals and/or the use of sprinkler systems, would have to provide a fee per farm and per acre, plus maps of acreage and details of irrigation practices.
This will be a problem for Don McBee, who irrigates off the Fort Lyon Canal. McBee has known for a long time that trouble was coming, and he has tried to warn other farmers. McBee said that the water received in the ending part of the Fort Lyon and Amity canals is so full of silt that the farmers have to let the water settle out before it can be used in sprinklers or drip systems. He has advised the farmers to line all of the ditches they can before regulations are put in force next year which may prevent lining of ditches and laterals. Now any improvements he makes could be fined.
The pond loss through seepage is extreme. He has proposed a pond study that will establish the water loss to seepage that occurs when water is stored in ponds. When water is short, ponds dry up and crack. He hopes to establish a standard percentage of loss to be credited to farmers.
Dr. Mark Bartolo of the Colorado State University Arkansas Valley Research Center in Rocky Ford is working with an experiment called a lysimeter. The lysimeter is a measurement device rather like an eight-foot cube flower pot buried out in a field, he said. The gauges are on top, but the inward part is reached by going down a ladder underground. The lysimeter measures how much water a plant uses, how much passes through, and how much evaporates. The results from the lysimeter are used as a mathematical basis to correlate with weather data obtained from 12 small meteorological stations located from Pueblo to Holly. New developments in technology are happening all the time, but the lysimeter offers the most scientifically valid data for water consumption available at the present time. McBee hopes that his pond seepage study may receive approval similar to that granted to the lysimeter data.