From The Crested Butte News (Katherine Nettles):
It appears drought contingency planning is officially underway for 2021 and 2022 throughout the Colorado River Basin, and water banking in conjunction with conservation and curtailments may be the way of the future. As a newly appointed Colorado River District board member, Kathleen Curry gave Gunnison County commissioners an update recently on the River District board meeting she attended in late January.
Among the biggest concerns, said Curry, are drought conditions that persist even on years with pretty good snowfall. “Even when the snowpack is decent, it’s not all getting down to the major reservoirs. Maybe it is soil moisture, maybe ambient temperatures, I’m not sure that we know exactly why. But the whole system will be under a drought release scenario and that does include Aspinall unit operations,” she said.
As of March 9, the Upper Gunnison Basin snowpack was 76 percent of average according to the Gunnison River Basin website. The spring (April through July) unregulated inflow volume to Blue Mesa Reservoir is forecast to be 68 percent of average. The website estimates that flows originating from the Gunnison River Basin historically contribute about 17 percent of the total flows in the Upper Colorado River Basin, accounting for water that approximately 6.8 million people annually rely upon.
Lake Powell may drop
Curry described Bureau of Reclamation projections that Lake Powell will release 8.23 million acre-feet to Lake Mead, with around 6 million acre-feet coming in and resulting in an overall decline in water storage.
“So we have to send that water down to Lake Mead, but the Bureau is projecting this declining hydrology to put us into some new drought contingency planning,” she explained. The contingency plan has now formally been triggered per 2007 agreements…
“In 2022, our releases [from Aspinall] will decrease from 8.23 to 7.48 million acre-feet, which is good, it gives us a little bit of relief. But still, those releases are higher than the inflows, most likely. Powell will continue to drop,” she predicted…
Demand management and water banking
The River District has kicked off a stakeholder advisory group on demand management, which is also being discussed at state levels.
“It’s the talk of the town. Everybody’s been thinking about it for a couple of years now,” said Curry. The idea is a voluntary, temporary and compensated water conservation program could put water aside in a 500,000 acre-foot storage pool in Lake Powell to help the state deal with Colorado River Compact compliance issues and shortages. “There are a couple pieces to this demand management discussion,” said Curry.
She said there are questions of funding, impacts, participation and whether there could be enough water generated to make a difference. Five participants from the Gunnison Basin have joined the group, and will give input to the Colorado Water Conservation Board in June or July.
A lot of water rights in the Gunnison Valley are junior to the compact, and both those and senior water rights could become a part of the dialogue. “So we have an interest, since we are an agricultural basin, in this issue,” said Curry.
County commissioner Liz Smith asked how water banking could benefit the communities doing the conservation, versus that water being drawn from downstream users in the past. Curry agreed that there had not in the past been a way to account for historic consumptive use and subsequent water savings, but there are methods being developed for logging and saving that water.
Curry also reviewed some conservation techniques for water banking, including curtailment programs where ranchers would fallow their land for either part of a season or an entire season.