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Posts Tagged ‘reservoirs’

The rain that fell last week on the Mt. Tamalpais Watershed measured 0.21 inches, bringing total rainfall to date (July 1-September 21) to 0.25 inches. While the small amount of rain was enough to be measured and to help settle the dust, it did not contribute to higher reservoir levels.

Here are the current water statistics:

Reservoir Levels: As of September 21, reservoir storage is 51,662 acre-feet,* or 65% of capacity. The average for this date is 55,148 acre-feet, or 69% of capacity. Total capacity is 79,566 acre-feet.

Rainfall: Rainfall this year to date (July 1-September 21) is 0.25 inches. Average for the same period is 0.52 inches.

Water Use: Water use for the week of September 15-21 averaged 25.19 million gallons per day, compared to 30.06 million gallons per day for the same week last year.

Creek Releases: During the month of August 2014 MMWD released 164 million gallons, or a total of 504 acre-feet, into Lagunitas and Walker creeks in west Marin for habitat enhancement.

Water use and reservoir figures are updated weekly and can be found on our Water Watch page.

*One acre-foot is 325,851 gallons

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MMWD reservoir levels are now 92% of average, which may be a surprise to many during this dry year. Our reservoir levels have actually held steady at this same ratio for several months now, thanks in part to customer conservation efforts and also to water system operational changes. The more water we can keep in the reservoirs now, the better off we are later.

Here are the current water statistics:

Reservoir Levels: As of August 25, reservoir storage is 53,843 acre-feet,* or 68% of capacity. The average for this date is 58,648 acre-feet, or 74% of capacity. Total capacity is 79,566 acre-feet.

Rainfall: Rainfall this year to date (July 1-August 25) is 0.04 inches. Average for the same period is 0.12 inches.

Water Use: Water use for the week of August18-25 averaged 27.32 million gallons per day, compared to 31.79 million gallons per day for the same week last year.

Supply Source: Last week we averaged 20.03 million gallons per day from our reservoirs and 7.29 million gallons per day from the Russian River.

Creek Releases: During the month of July 2014 MMWD released 171 million gallons, or a total of 524 acre-feet, into Lagunitas and Walker creeks in west Marin for habitat enhancement.

Water use and reservoir figures are updated weekly and can be found on our Water Watch page.

*One acre-foot is 325,851 gallons

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MMWD’s water production for the period February-June 2014 was 15% lower than production for the same period in 2013. Many thanks are due to district customers for quickly heeding the MMWD Board of Directors’ January 21 call for voluntary reductions in water use. The board took that action just days after Governor Jerry Brown requested statewide voluntary reductions in water use.

The 2013-14 rainfall year ended on June 30 with a total of 33.4 inches, which is approximately 64% of the long-term annual average. By contrast, total reservoir storage at the end of the 2013-14 rainfall year was 90% of average. The near-normal storage levels are due to unusually high rainfall in February, customer conservation efforts, and higher Russian River water deliveries.

Here are the current water statistics:

Reservoir Levels: As of July 22, reservoir storage is 57,524 acre-feet,* or 72.3% of capacity. The average for this date is 63,144 acre-feet, or 79.36% of capacity. Total capacity is 79,566 acre-feet.

Rainfall: Rainfall this year to date (July 1-July 22) is 0.03 inches. Average for the same period is 0.04 inches.

Water Use: Water use for the week of June 14-20 averaged 28.29 million gallons per day, compared to 31.38 million gallons per day for the same week last year.

Supply Source: Last week we averaged 20.76 million gallons per day from our reservoirs and 7.53 million gallons per day from the Russian River.

Creek Releases: During the month of June 2014 MMWD released 200 million gallons, or a total of 614 acre-feet, into Lagunitas and Walker creeks in west Marin.

Water use and reservoir figures can be found on the Water Watch page of our website.

*One acre-foot is 325,851 gallons

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The rainfall year ends on June 30 and in all likelihood we will not receive much, if any, additional rain in the remaining few days. Total rainfall at Lake Lagunitas for the rainfall year ending June 30 will top out at around 33.40 inches, which is about 64% of the annual average. This marks the third consecutive year of below average rainfall, and the reservoir storage levels reflect those low numbers.

The current reservoir storage is the lowest it has been for this date since the early 1990s. If not for the ongoing conservation efforts of our customers, and the especially heavy rain in February, we would be in a far worse position than we are today.

The MMWD Board of Directors’ call for 25% voluntary rationing is still in place and current consumption figures show reduced water use. We appreciate everyone’s conservation efforts and we encourage customers to take advantage of the district’s many conservation programs and rebates. Get more information here.

Here are the current water statistics:

Reservoir Levels: As of June 22, reservoir storage is 60,533 acre-feet,* or 76% of capacity. The average for this date is 67,290 acre-feet, or 85% of capacity. Total capacity is 79,566 acre-feet.

Rainfall: Rainfall this fiscal year to date (July 1-June 22) is 33.40 inches. Average for the same period is 52.56 inches.

Water Use: Water use for the week of June 16-22 averaged 28.78 million gallons per day, compared to 32.27 million gallons per day for the same week last year.

Creek Releases: During the month of May 2014, MMWD released 218 million gallons, or a total of 669 acre-feet, into Lagunitas and Walker creeks in west Marin. We release water throughout the year to maintain adequate flows for the fishery per our agreements with the State of California.

Water use and reservoir figures can be found on the Water Watch page of our website.

*One acre-foot is 325,851 gallons

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Record low rainfall in 2013 means the official “water year” designation for Lagunitas Creek in west Marin will be “dry” from April through October 2014 in accordance with MMWD’s water rights order from the State of California for the creek. This designation was made because there was less than 28 inches of rainfall at Kent Lake from October 1, 2013, through March 31, 2014. Average for that six-month period is 45.5 inches.

This year marks the first time a dry year has been in effect since the water rights order was issued in 1995. The in-stream flow requirements (water released from Kent Lake into Lagunitas Creek) applicable during “dry years” are slightly lower than the requirements for “normal years” and are designed to keep fish in good condition while preserving our water supply. The flow rate will be reconsidered in December 2014 depending on rainfall between now and then.

MMWD releases water from Kent Lake into Lagunitas Creek throughout the year to maintain adequate flows for fish.

MMWD has also reduced releases into Walker Creek from Soulajule Reservoir this spring.

Here are the current water statistics:

Reservoir Levels: As of May 25, reservoir storage is 63,306 acre-feet,* or 80% of capacity. The average for this date is 70,259 acre-feet, or 88% of capacity. Total capacity is 79,566 acre-feet.

Rainfall: Rainfall this fiscal year to date (July 1-May 25) is 33.40 inches. Average for the same period is 51.90 inches.

Water Use: Water use for the week of May 19-25 averaged 26.95 million gallons per day, compared to 30.69 million gallons per day for the same week last year.

Supply source: Last week we averaged 18.04 million gallons per day from our reservoirs and 8.91 million gallons per day from the Russian River.

Creek Releases: During the month of April 2014 MMWD released 196 million gallons, or a total of 601 acre-feet, into Lagunitas and Walker creeks in west Marin.

Water use and reservoir figures can be found on the Water Watch page of our website.

*One acre-foot is 325,851 gallons

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Although rainfall this year is just 66% of average, we received sufficient amounts of rain in February and March to raise reservoir levels to near-normal levels. And we even got a half inch of rain in late April as a bonus.

As we enter the irrigation season, MMWD’s water supply situation is much better than that of many parts of California. According to the U.S. Drought Monitor, conditions throughout the state range from moderate to exceptional drought. These conditions are quite evident in the dramatic photos of reservoirs and the Sierra snow pack on the home page of the California drought information website.

MMWD’s request for a 25% voluntary reduction in water use is still in effect, although the Board of Directors will review this request at the end of May.

Here are the current water statistics:

Reservoir Levels: As of April 27, reservoir storage is 65,213 acre-feet,* or 82% of capacity. The average for this date is 72,152 acre-feet, or 91% of capacity. Total capacity is 79,566 acre-feet.

Rainfall: Rainfall this fiscal year to date (July 1-April 27) is 33.22 inches. Average for the same period is 50.20 inches.

Water Use: Water use for the week of April 21-27 averaged 20 million gallons per day, compared to 27 million gallons per day for the same week last year.

Creek Releases: During the month of March 2014 MMWD released 303 million gallons, or a total of 930 acre-feet, into Lagunitas and Walker creeks in west Marin.

Water use and reservoir figures can be found on the Water Watch page of our website.

*One acre-foot is 325,851 gallons

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by Paul Scott, Volunteer Watershed Ambassador

Bon Tempe and Mt. Tamalpais

Bon Tempe Lake on the Mt. Tamalpais Watershed

Earth Day is upon us! This is the time to ponder our relationship with our one and only planet. In this regard a major force for me has been Mt. Tamalpais, the “crown jewel” being MMWD’s watershed lands.

The Mt. Tamalpais Watershed consists of five reservoirs and primarily the north-facing slopes of the mountain that shed rainwater into them. These “lakes” have been here long enough that they are now a focal point for the diversity of flora and fauna found here. Camping, hunting, swimming, and boating are a no-no and cars have very limited access, so it’s an oasis of sorts for natural processes to occur with minimal human disruption. While the “purpose” of these lands is to provide clean drinking water, requiring wise ecological practices, we are also blessed with their biodiversity and many recreational opportunities.

The natural resources staff work out of Sky Oaks Watershed Headquarters located in the hills above Fairfax and in close proximity to three of the reservoirs. Their volunteer program offers abundant opportunity for young and old, all geared toward environmental education, wise resource management, and furthering community spirit. As a volunteer and near-daily visitor to the watershed lands myself, I see folks come to visit with smiles on their faces. Many of them are “regulars” who tell me they feel the same way I do about the area—it is a place of peace and sanctuary. I’m amazed how many come from other countries, but I’m most surprised when I meet local people who had no idea all this was here.

Come develop your relationship with your watershed—for Earth Day and any day. Experience a fine example of how humans can make use of natural resources in an intelligent and sympathetic manner for everything and everyone to share.

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