The warm and wet storm of the past 3 days has reversed Tahoe’s water decline – at least for now. Tahoe has risen over an inch with an upward trend and now stands 4.8″ below its rim (12/4/14). Still no water will flow into the Truckee River from the Lake, but it is better than a continual decline. Much of the rise is likely due to water falling directly on the surface of the lake. (See my last post regarding this phenomenon.) If wet weather continues, then we can expect a much improved water situation, but whether or not we’ll see an end to the long-term drought remains in doubt.
Category Archives: Keep it flowing
Storm came and went – no positive impact on Tahoe’s elevation, yet
The first ‘winter’ storm came in on Nevada’s Sesquicentennial Celebration on the evening of October 31 and was pretty much gone by the afternoon on November 1. I was watching to see if there was a marked change in the elevation of Lake Tahoe indicating that the storm brought significant rain or snow to the Tahoe Basin itself and not just snow at the upper elevations. The following graph illustrates why I’m disappointed with the storm’s impact on the drought.
Lake Tahoe is huge covering 192 square miles (See Tahoe fast facts below). And, its entire watershed is just 501 square miles. What is significant about these numbers? Lake Tahoe itself occupies 38% of its own watershed. And, precipitation either as rain or snow at lake level directly raises the level of the Lake. Twelve inches of rain or snow, for example, over the course of a winter, falling on the surface of the lake will raise the lake’s level 12 inches even before the snow in the mountains melts and enters the lake through the lake’s many streams.
Unfortunately, the storm didn’t produce much rain or snow, apparently, at the surface of the Lake. (7″ of snow was reported at one ski area near Echo Summit on Highway 50.) If you look closely at the above graphic, you’ll see there was a slight bump up in the elevation of the lake, but by today (Nov 3, 2014), the surface elevation has fallen lower than before the storm hit. The lake is now 3.6 inches below its natural rim. Until it rises above 6,223 feet in elevation no water can enter the Truckee River at the Tahoe Dam.
Still more bad news in the recent forecast maps for continued drought in the west which show California and Nevada (even Washington and Oregon) seeing more heat and less rain and snow. Not a good combination, for sure.
Lake Tahoe Fast Facts (from the EPA website)
- Lake Tahoe is 2 million years old
- Size of watershed: 501 sq. miles
- Lake surface area: 192 sq. miles 1,645 ft. deep
- 6,223 ft. elevation (natural rim)
- 2 states: CA, NV
- 5 counties, 1 city
- 50,000 Tahoe Basin year-round residents
- Majority of private property owners are part-time residents
- US Forest Service and state agencies manage almost 85% of land area
- Average surface water temperatures are 68° Fahrenheit in the summer and 41° in the winter
- 63 streams feed into Lake Tahoe but only one, the Truckee River, flows out
- Approximately 3 million people visit Lake Tahoe every year
- The Lake is designated as an Outstanding National Resource Water under the Federal Clean Water Act
- Lake Tahoe is the second deepest lake in the United States
- Lake Tahoe is so deep that a single drop of water entering the Lake today will take about 650 years to find its way out
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Winter Weather on its way at last?
URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE RENO NV 1111 AM PDT THU OCT 30 2014 ...FIRST WINTER STORM OF THE SEASON FOR HALLOWEEN... .AN EARLY SEASON WINTER STORM WILL BRING MODERATE TO HEAVY SNOW TO THE SIERRA FRIDAY EVENING INTO SATURDAY MORNING. THE MAIN IMPACT FROM THIS STORM IS HAZARDOUS TRAVEL CONDITIONS WITH WHITEOUT CONDITIONS AND CHAIN CONTROLS OVER THE SIERRA PASSES. THIS STORM WILL LEAD TO THE WINTER CLOSURES FOR THE PASSES IN ALPINE AND MONO COUNTIES.
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Gambling on Truckee Meadows water supply
On Sunday, September 28, 2014, the Reno Gazette-Journal published a headline story by Jeff DeLong: “Cusp of a Crisis” laying out the uncertain future for Reno-Sparks water supply. Therein the Truckee Meadows Water Authority says it is relying on the “history” of the Truckee River to “pop us out of this drought cycle.”
But as we’ve written before, can we really rely on the past flows of the river to predict the future as each decade is warmer than the last? Delong provides the stats demonstrating that the concern for water supply is real, but doesn’t write how the community will deal with it. TMWA seems to be just spinning the roulette wheel.
- Lake Tahoe at 1.2″ above its rim (Sept 30, 9 cubic feet per second (CFS) flows out)
- Boca, Stampede, and Prosser Reservoirs at 19%, 25%, and 26% of capacity
- TMWA’s drought storage reservoirs Donner and Independence at 66% and 91% of capacity (which in actual water is a little less than 22,000 acre-feet)
- Customers reduced their use – TMWA claims by 10% saving 1,150 acre-feet – but leaves out if this is compared to last year or last month
- The river at Farad is flowing at 100 CFS and 57 CFS through Reno (“normal” at Farad would be 5 times greater at 500 CFS).
- TMWA serves 93,000 customers – 73,873 residential customers have water meters
- Washoe County Water Resources Department and South Truckee Meadows General Improvement District will soon be merged into TMWA giving it 115,000 customers (basically, all the houses and businesses in the Reno-Sparks area)
- 4,469 residential customers are still on a “flat rate”; they pay $100.63 per month regardless of how much water they use
Delong reported that Mike Carrigan, who serves on the TMWA board, favors requiring all TMWA customers be metered – especially important now that the drought has so reduced water supplies. Water meters for all customers are long overdue. Delong wrote that the average flat rate customer (not metered) uses more than twice as much water as an average metered customer – 282,000 gallons compared to 124,000 gallons – per year presumably, although it isn’t stated in the article.
There are some big water users out there, too. In 2013 one residence used 6.1 million gallons of water and another used 4 million gallons. The 91st person on the list used nearly 900,000 gallons in 2013. Should a single residence be using enough water to support 50 residential customers? Should there be no limit for water use as long as the customer can afford it?
As interesting as reporting the top 100 water users is, the real issue is that the more water all of us use, the less water is available for the Truckee River which is the keystone of our community and the life-blood for fish and wildlife from Lake Tahoe to Pyramid Lake.
While meters are critically important to any water conservation program, without the proper rate structure and commitment by the water agency to set the rates to conserve water, customers have no reason to think about how much water they use. We discussed before that the current metered water rate structure does little to conserve water.
No one knows what the weather will bring this winter; and that’s just the point. With our high per person water use, Reno-Sparks residents are victims of the gamblers mantra: “I’m feeling lucky.”
Is that a good way to run a community?
RGJ identified that some excessive water use comes from an unsuspected leak. Suspect a leak indoors or outdoors at your house is wasting water? Call the Truckee Meadows Water Authority at 775-834-8005 to set up a water audit or if you’d like to try to find a suspected leak on your own go to TMWA’s website here.
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Water for Tesla? Not a problem?
When you think of an industrial facility such as the Tesla Lithium Battery Gigafactory, it is easy to overlook the need for water to run it. But most places that make things need to use water at some point in the process. The Tracy power plant east of Reno is an example. It is located on the Truckee River because to make power you need water for both the steam-powered turbines and for cooling. How much water will the Tesla Lithium Battery Gigafactory require every year? Will Tesla’s gigafactory recycle water and have little net use of water? Or will it require lots of water?
On September 5th, Mark Robison of the RGJ wrote an article “No water worries for Tesla at Reno industrial park.” Therein he quotes the owner of the Tahoe-Reno Industrial Park (TRI), Lance Gilman, as claiming he has ample water.
“We’re really not impacted by the drought situation,” [Gilman] said. “Our water source appears to be incredibly stable and we haven’t seen a change in it at all (during the drought). We can pump 2 to 3 million gallons a day or more under today’s capacity and that’s, of course, expandable dramatically.”
In a more recent RGJ article on Reno’s potential lack of sewer capacity, it said TRI would like to receive water from the Truckee Meadows Water Reclamation Facility.
” The Tahoe Reno Industrial Center has already expressed interest in the effluent. The Regional Plan, however, prohibits the gray water from being shipped out of the service area.”
The TRI facility lies within the Truckee River watershed and groundwater or surface water use will impact the Truckee River and Pyramid Lake and communities east of the Truckee Meadows.
How much water Tesla needs and where that water will come from did not appear to be part of the decision-making process for Governor Sandoval’s negotiators.
It should have been. The Tesla deal could cost us a lot more than the negotiated $1.25 billion.