Category Archives: Drought

Draft TMWA 2020-40 Plan: Leaves Out Water Efficiency…Again

Water Wasted

Conservation and drought management ranked high by 90% of respondents to TMWA’s (Truckee Meadows Water Authority) survey of topics of importance to be addressed in the 2020-2040 TMWA Plan 5 year update. And, as before, TMWA talks generally about conservation but has no definitive goals and no new actions to achieve water efficiency to reduce per capita demand for its customers.

Fly fisherman on Truckee River in mid-November 2018
Fly fisherman on Truckee River in mid-November 2018

TMWA’s update, like the previous plan, doesn’t look to water efficiency instead calling for “enhanced conservation” by its customers only during drought. TMWA’s “Enhanced conservation” asks customers to reduce water use by 10% during level “2” to “4” droughts for between 3 months to a maximum of 5 months. In a level 1 drought or non-drought, TMWA’s plan update calls for “standard conservation”. But standard conservation offers no incentives, strategies or goals to reduce per person water use and appears to rely exclusively on an even-odd address, 3 days per week outdoor watering. TMWA has no plan to implement programs to help its customers be more water efficient over the next 20 years of the plan during all conditions. Hardly forward looking for a desert community with less than 7″ average annual precipitation, long, hot, dry summers, and rising temperatures year-after-year.

This year Reno saw just 3.81 inches of precipitation in the form of rain and snow since October 1, 2019 – over 10 months. And, Reno’s summer temperatures are hot and likely for overall average annual temperature to approach or even top those of the past. Indeed, we live in a desert and need to be efficient and conserve the little water the region has to support people and the environment.

A Chart in TMWA’s plan update shows that for the past five years water use in its service area has been right around 150 gallons per person per day (GPD). That’s more than many other western cities including Las Vegas where customer water use has declined to 120 GPD. And, Las Vegas expects to continue to lower the GPD through its water efficiency programs. TMWA should be doing the same to lower its need for expensive engineering solutions and new groundwater sources.

water runs down gutter from lawn sprinklers
water runs down gutter from lawn sprinklers

Too often water runs down the gutter from over-watering and inefficient or broken outdoor sprinkler systems. Once water is running down the gutter it will eventually end back up in the Truckee River with contaminants of all kinds – discarded waste and oil being common. Water waste becomes more common with ineffective incentives for customers to conserve. People-unfriendly, grass-fronted roads in business districts send water spraying into adjacent streets. These water wasteful spaces offer little to the public and could and should be replaced with appropriate water conserving landscapes, instead. With proper water efficiency incentives adopted, TMWA’s plan update could encourage appropriate low-water landscaping that offers more interesting plantings that offer more shade and function. TMWA needs a plan update that identifies implementing better options for customers to save water and lower overall demand.

The 2020-2040 TMWA Plan update doesn’t contain any new initiatives or changes to its water pricing structure. While TMWA’s website promotes the plan as an call to action, the plan update contains no new direction regarding water use.

Of the customer insights collected so far, the top concerns are related to two topics: population growth and extreme climate variation. TMWA’s approach to these issues are woven throughout this plan.

(https://tmwa.com/article/tmwa-seeks-public-input-for-draft-2020-2040-water-resource-plan/)

TMWA, however, continues its past approach of drilling wells, diverting more water, and pumping water underground just like its previous plan. Other cities have consistently seen the error in this approach and have found customer friendly ways to reduce demand and delay or eliminate the need for expensive new water infrastructure. Further, TMWA’s own projections show that its approach will lead to shortages under climate change scenarios. Nevertheless, the plan essentially ignores these results saying that the problem will only occur in-the-future and outside of the planning horizon. Such an approach lacks credibility and puts the entire plan in doubt.

Dry time along the Truckee River walk
Low flows along the Truckee River Trail near Idlewild Park

You can still comment on the plan here. Or write to your Reno or Sparks City Council Representative or Washoe County Commissioner.

Snow drought in an average year of precipitation for Truckee River

NRCS 4-24-2018 - Total Precipitation vs. Snow Water Equivalent for water year to date

The Truckee River watershed saw more rain than snow this year. So, this year appears to continue the trend of at least the last decade as rain replaces snow – especially at lower elevations. The maps show just how significant the effect is as we approach the end of the first month of spring. Many sites in the Truckee River basin (including the Tahoe basin) are reporting 101% of the longterm average for precipitation. The picture is different for snow water equivalent, however. Snow water equivalent (the amount of water in the snow pack) is almost or well below the longterm average for this date for sites at lower elevations. You have to go to the highest elevation sites to see average snow water equivalent conditions.

In the graphic below, the blue dots on the left represent sites where total precipitation is 101% and the white sites represent 100% of the long-term average. On the right the 3 sites (between 6400′-7700′) in red have 0% of snow water left; the orange sites have 50% of snow water left compared to the long-term average. Only the site at Big Meadow (8235′) shows 101% of snow water left and one site at Heavenly Valley (8500′) shows 100% of snow water left – both high elevation sites. Click on the graphic to see full size. Or check out the site yourself here.

NRCS 4-24-2018 - Total Precipitation vs. Snow Water Equivalent for water year to date

NRCS 4-24-2018 – Total Precipitation vs. Snow Water Equivalent for water year to date

If the trend continues as expected, there will be very little snow left to melt in the late spring and early summer. When snow disappears earlier, natural stream flow of tributaries and the Truckee River itself decrease. Less natural stream flow often results in additional releases from reservoirs or increased ground water pumping because of our long, dry summers.  Ultimately, it will negatively affect recreation and fish and wildlife that depend on water in the Truckee River.

Spring Equinox Storm brings late surge in Truckee River basin snowpack

Rain over a two day period in Reno is always a rare event. Even less common is a spring equinox atmospheric river storm that drops nearly an inch of rain at the airport in Reno. I recorded 1.75″ of rain in NW Reno from March 20 to 22 while temperatures during the storm never dropped below 42ºF. While the storm was relatively warm and produced mostly rain below 6,000 feet, the snowpack in the Lake Tahoe and the Truckee River basins saw a significant boost. Flows in the Truckee River on Thursday afternoon surged to 4,000 cubic-feet-per-second (CFS) from 500 CFS earlier in the week. If you didn’t get down to the river, check out the video from Whitewater Park at Wingfield Park in downtown Reno yesterday.

The NRCS is now reporting a significant improvement to the area snowpack. In February the snowpack was in the 30 percent of average range. As of today (3/23/18) reports show the snowpack in the Lake Tahoe basin is 77% of the average and the Truckee River basin stands at 80% for snow-water equivalent. The Carson River is at 88%.

The National Weather Service forecasts another colder (but less wet) storm is heading into the Tahoe and Truckee basins late today and continuing into Sunday. It remains to be seen if the new anticipated storm adds significantly to the snowpack. Forecasts for next week show no precipitation with temperatures rising into the mid-60s.

Eastern Pacific circulation as of 3/23/2018 mid-day. (Click for full size)

Lake Tahoe’s water surface elevation rose continuously during the spring equinox storm to stand at 6,228.6 feet. Its legal limit is 6,229.1 feet. Depending on how much runoff results from the snowpack (and any additional snow and rain), there should be good flows from Lake Tahoe into the Truckee River this spring. One thing for sure, the dismal winter up until late February has seen a significant reversal with the late season storms.

Lake Tahoe’s water surface elevation has risen nearly a foot since early in 2018. The recent storms alone resulted in a half-foot rise.

Two day storm short on snow

It didn’t snow much during the last 48 hours despite forecasts for some significant snowfall. Mt Rose Ski Resort reported only 3″ from the storm that could still produce some precipitation today and tonight while Squaw Valley reports 4″ at 8,200 ft. Forecasts call for another storm next week, but we’re still in need of significant storms to produce an average winter in the Tahoe-Truckee basin.

Storm approaches: more snow or more rain?

Forecast for winter storm approaching California coast and heading to the Sierra. Click for full size.

A weather system is approaching the California Coast and the National Weather Service forecast isn’t sure how intense the snow will be around the Tahoe area.

The storm could be more intense to the south and pack less cold air resulting in less snow or rain rather than snow. Initial snow levels are expected to start at 8000 feet in the mountains and then drop to around Lake level. None of the forecasts call for snow in the Reno area.

Rain in the mountains pushed up Truckee River flows through Reno. Click for full size.

 

 

The storm last week pushed river flows up to around 900 cubic-feet-per-second in Reno on Saturday and pushed Tahoe’s water surface elevation up about 1.3 inches.†

 

 

† Truckee River flows peaked today at 900 CFS at Pyramid Lake due to the distance of more than 40 river miles the water must travel. We still have a long way to go to recover from the dismal dry December 2017 to “make up” for the deficit in long-term average river flows over the drought years from 2000 to 2016.

Truckee River flows at Pyramid Lake.