
Here’s a recap of the session, from Chris Woodka writing for The Pueblo Chieftain. From the article:
“Averages are not a real tool for development,” [Eric Wilkinson, director of the Northern Colorado Water Conservancy District] said. “These numbers need to be used for planning purposes and for compact compliance discussions. I guess one word strikes me: storage.”
Wilkinson, whose northern district is trying to get approval for building two new reservoirs and firming yield from current import diversions, explained that storage is the best way for Colorado to balance the unknowns of nature. Water users need to be ready for both wet and dry scenarios, Wilkinson said. “If there’s nothing left (of the compact entitlement), a curtailment would hurt us,” he said. “If there’s water to be developed, we’ll push to get water development.”
If enough water is stored in wet years, it is easier to make it through the droughts, he said. “We need to have our eyes wide open,” Wilkinson added. “Colorado owes it to itself to explore all opportunities to use the Colorado River, but we don’t want to get ourselves into a hole.”[…]
The CWCB this week also agreed to enter into a basinwide study with the other six states in the Colorado River Compact (Arizona, California, Nevada, New Mexico, Utah and Wyoming). That study will use the information Colorado has spent the past two years gathering. At the same time, the state will be applying parts of the study to its other water planning efforts from decision support models to floodplain mapping. The study itself will enter another phase that will look at the potential for changing uses or climate conditions, Gimbel said. “We will get more information as we are planning for the future,” Gimbel said. “We also need to look at storage strategically and use it for our advantage.”
More coverage of the availability study from Chris Woodka writing for The Pueblo Chieftain. From the article:
The Colorado Water Conservation Board Tuesday reviewed Phase I of Colorado River Availability study, and learned there are more questions than answers when it comes to things like climate change, future demand and changed uses of water. The report will be released for public review in February. “The Colorado River is one of the most important sources of water supply for the state,” said Jennifer Gimbel, executive director of the CWCB. “Colorado needs solid information in order to make smart decisions about future water development.”
The assessment, funded by $1 million from the state Legislature in 2007, is the most comprehensive to date on Colorado River supplies. It will be used within nearly every other water planning effort in Colorado. “This study rolls into every hallway at the CWCB,” Gimbel said…
All models show the Colorado River basin will be warmer, with more precipitation in winter and less in summer. Growing seasons will be longer, and runoff earlier, meaning a net gain in agricultural water use and more draw-down on reservoirs, said Ben Harding, a CWCB engineering consultant. “One dry year is not going to do us in. We got through 1977 and 2002,” Harding said. “The sequence of years is important.”[…]
The models are drawn from both historical data from 1950-2005 and extrapolations using tree rings to look at conditions back to 1500. Looking ahead, engineers selected five models out of more than 100 available data sets to project what would happen in 2040 and 2070. Some of the models actually show increases in water availability, but all anticipate that increased demand by agriculture — which uses 85 percent of water — would soak up any gain. The 500-year trend surprisingly indicates that the past 50 years were wetter than average, because of unusual clusters of wet years in the 1980s and 1990s. There were also greater extremes in the types of wet and dry years. Models for the future shuffled both types of years to forecast various scenarios. The difference between 2040 and 2070 would not be as great as originally thought, Harding explained…
It is also unclear whether the assessment opens or closes any doors for transmountain water increases, either through existing projects or new proposals. Nearly 500,000 acre-feet annually comes across the Continental Divide to serve needs in the Arkansas and South Platte river basins. Cities are looking for future supplies. At the same time, water is used on the Western Slope to serve the needs of endangered species, and more could be needed for growth and energy development. “It’s a good first step,” said Eric Kuhn, executive director of the Colorado River Conservation District. “It’s pretty clear that there is probably a limit to what we can do. From the river district’s perspective, our approach will be wait and see.”
More Colorado River Basin coverage here.
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