
From the Valley Courier (Ruth Heide):
State Engineer Dick Wolfe approved a presumptive irrigation season of April 1 to November 1, a time period that not only applies to surface irrigators but also groundwater irrigators. “This will affect wells also,” said Colorado Division of Water Resources Division 3 Engineer Craig Cotten. “We haven’t dealt with those much in the past. Usually in the wintertime we put notices in the newspaper asking well owners to shut down, usually artesian wells, during the winter time, but it’s been a voluntary process and this will be a mandatory process…
He said the process actually began with Senate Bill 222, the legislation that established the sub-district concept. It also stated that the state engineer had to establish criteria for setting the irrigation season for Division 3, the San Luis Valley. Wolfe enlisted the help of about 50 folks on an advisory committee to help develop the groundwater rules for Division 3. Those rules are nearly completed. As part of that task, the advisory committee set up a sub-committee to develop an irrigation season policy in conjunction with the state engineer, Cotten explained. Wolfe signed the policy on April 14, after the commencement of the irrigation season…
The policy sets the presumptive irrigation season as April 1 to November 1, but several criteria can be used to adjust that time period, Cotten explained. One factor that Cotten could use to adjust the irrigation season would be the status of the Rio Grande Compact deliveries on the Rio Grande and Conejos River systems. “That’s what we use usually in determining when to shut off the ditches on the Rio Grande right now,” Cotten explained. He added that deliveries are good right now, so that November 1 shut-off will probably hold true for the Rio Grande. On the Conejos system, Colorado is showing a little bit of over delivery in its compact obligations, Cotten said, “so we may let the irrigators run a little bit longer into November on the Conejos…
Another factor that Cotten will consider is the use of historical practices. Some people have historically iced their meadows in the wintertime. Those who would like to continue that practice must go through water court and obtain judicial confirmation of that historical practice. Several people have applied for that judicial confirmation already. Another factor will be winter irrigation of crops such as alfalfa that might require some moisture in a dry winter when there’s no snow on the ground. Cotten may consult with agronomic and irrigation experts to determine if such irrigation would constitute beneficial use for irrigation water. Well owners who plan to do that should contact the water division office. Those will be reviewed on a case-by-case basis…
Cotten said one of the reasons it is important to set an ending date for the irrigation season is so the reservoirs and those with winter recharge water rights know when they can begin using their rights, because their rights are junior to the ditches. “This first year will be a learning experience for everybody,” Cotten said.
More Rio Grande River basin coverage here.
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