#ColoradoRiver: The Plan to Strengthen Denver’s Water Supply — 5280.com #COriver

Gross Dam enlargement concept graphic via Denver Water
Gross Dam enlargement concept graphic via Denver Water

From 5280.cm (Amy Thomson):

Considering the Denver region is growing by an average of 4,500 new residents per month, a large sector of the population likely doesn’t remember the catastrophic 2002 drought. The most severe water shortage since the Dust Bowl, snowpack and soil moisture were at all-time lows, and we remained in a dry period until 2006. Luckily, with water restrictions in place, we never actually ran out of water—we just got really close.

“We realized that we had an immediate need to correct a vulnerability in our system,” Denver Water CEO Jim Lochhead says. That’s when Denver Water started planning the Gross Reservoir Expansion Project, and after more than a decade of negotiations, the project (which was recently endorsed by Gov. John Hickenlooper) is underway.

But will it be enough? The short answer is yes—as long as Denverites work on strengthening their water conservation practices. Lochhead was pleased to note that when a storm comes through the Mile High City, there is a noticeable drop in outdoor water use, because well-informed residents are turning off their sprinkler systems. Denver residents have managed to reduce water consumption by more than 20 percent in the last 15 years, even with a 15 percent increase in population, according to Lochhead.

The decrease is not enough to mitigate the risk of drought, however. As Colorado’s largest water utility, the Denver Water system is made up of two collection systems—the Northern and the South Platte—and they are incredibly imbalanced. About 80 percent of the water comes from the south system, leaving the north very vulnerable to low rainfall or wildfires. During the notable dry years of 2002 and 2013, clients in the north end were lucky their taps continued to flow.

“We were literally only one drought away from a major problem in our system,” Lochhead says, noting that as recently as 2013, the system was virtually out of water in the north-end.

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