Water conservation: how did Californians do after mandate (Part III)

How did Californians do for water conservation since the last report of Oct. and Nov. 2016 ?  In addition to the normal question of “does mandate make a difference”, another big question that comes very specifically with this winter season is : do heavy rains make a difference?

From the numbers of the 3 months from 11/2016 to 1/2017,  Californians did a great job conserving water, despite of no mandate and the time period being one of the wettest ever recorded in California’s history.  Here are the numbers: In November, December and January, Californians reduced water usage by 18.3%, 20.6% and 20.5% vs. 2013.   They are very consistent at about 20% level, slightly increasing from that achieved in Sept and Oct at about 19%.

ca water conservation

Remarkable Achievement

The water conservation achievement in the 3 months of 2016 winter season is very remarkable.

First, it is the first time that Californians conserved more than they did in the same months of 2015.  After the statewide water reduction mandate ended in May 2016, water-savings had been less than those achieved in same months in 2015, until Dec 2016, when the water-saving turned in 13.2% higher. January was even better at 19.2%.

water conservation

Even more amazing is this was achieved in an unusually wet winter.   To start off, winter normally is a slow time for water conservation, witnessed by last year’s lower levels in all cold months.  To top it off, last winter was one of the wettest ever recorded.  From the Northern Sierra 8-Station Precipitation Index, in Nov, Dec and Jan, the rainfall volumes this year almost double those of the average, and more than double those of 2015 at the same points of time.  In the face of such heavy precipitation, water-savings not only did not decline, but increase slightly by 8% is truly significant.

ca precipitation

While many factors might contribute to this great level of water-saving, one possible reason might be that some of the habits or products people acquired during the drought period stayed, for example, taking shorter showers, using high efficiency washing machines, etc.  As a lot of lawns were converted into water efficient gardens, with rain sensors and smart controllers installed, landscape irrigation might have saved a sizable amount of water too.

CA Drought Situation

As of March 14, 2017, according to the US Drought Monitor, 77% of the state is out of drought, with only 23% in slight or moderate droughts.   This is a huge decline from last year when most of the state was in extreme or exceptional drought.

ca drought

Keep Conserving Water

Even though we have had a hugely wet year, we can not lose sight about water and assume we will always have a lot of it.  During the 5 years of drought, groundwater was heavily pumped, which was so depleted that it will take many years and a huge amount of water for it to recover. With climate change and a hotter environment, consumption for water will go up while the snow storage we have been relying on will shrink down, creating a severe demand and supply situation.  It is projected that the Sierra snowpack can drop by half by the end of the century if greenhouse emissions continue at current speed, which can be disastrous for the state’s water supply.

It is clear water conservation should be our way of life, whether we are in a drought or not. Limit outdoor watering, as about half of water consumed by Californians is used outdoors.  Replace the lawn with a water efficient garden – Calculate how much water you can save here.

A water efficient garden will not only save water, but be beautiful as well. They can be full of California native charm, or fulfill some gardening dreams you have had for a long time.  Whichever design you choose, the water efficient garden can help us conserve water, and deal with water shortage now and in the future.

water efficient garden

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