Kind: captions
Language: en
- [Narrator] The news in 2020 said it all.
- [Newscaster] August Complex fire
has become the largest
fire in state history.
- [Narrator] A record setting year
for wildfires in California.
They burned over 4 million acres,
an area larger than the
state of Connecticut.
But wildfires don't just
happen, they need fuel.
And the thing that's been creating
a lot of fuel for fires lately is drought.
(gentle music)
Drought is back.
Already, across the Western United States,
extreme drought conditions cover more land
than any point in the last 20 years.
Which means the 2021 wildfire season
could be the worst yet.
Drought, simply put, is a lack of water,
usually caused by little or no rainfall,
but rain isn't the only source of water
for California's reservoirs.
- In California people rely a lot on snow.
- [Narrator] Melting snow from
the Sierra Nevada mountains
provides a third of
California's agricultural
and residential water supply.
- You may have average rainfall,
but way below average snow.
If you look at rainfall, you
may not see any drought signal,
but if you bring snow into the problem,
then you may practically end up
in a drought situation in California.
- [Narrator] That's what
happened this spring.
The snowpack was so small,
reservoirs barely received water
from melting snow and any remaining runoff
was absorbed into a parched ground.
But dwindling water supply
isn't the only problem
facing Californians.
- Drought interacts
with many other hazards
between 2012 and 2016 we
experienced a prolonged
and extreme drought in California.
The drought ended with a
series of extreme precipitation
in winter of 2017.
(thunder rumbles)
- [Narrator] Extreme drought,
then lots and lots of rain
all at once, resulting
in a rapid plant growth.
- Then the summit of 2017
was very hot and dry.
This dryness created perfect situation
for what dried the vegetation,
the shrubs and grass.
- [Narrator] The dried out vegetation
became fuel to feed, at that time,
the largest fire on
record, the Thomas Fire
in Southern California, which
forced over 100,000 people
to evacuate their homes.
Then a month later,
another disaster ricocheted
across the news, rain.
Rain's good for droughts,
but when it washed over the burned area,
it caused flooding and
landslides killing 23 people
near Santa Barbara.
In California, heat
waves, drought, wildfires,
and flooding operate together,
creating a deadly combination.
Then there's climate change.
- In a warming climate,
we expect faster snow melt
when snow falls on a burned environment
there's no canopy to protect
it against solar radiation,
it melts faster.
Faster snow melt, again,
increases the chance
of flooding in spring
and increases the chance
of drought later in summer.
- [Narrator] This cycle
doesn't just increase
the number of deadly wildfires,
drought is also reducing
the amount of drinking water
available in the region.
So what can we do about this?
Engineers are working on new ways
and new sources for
providing enough safe water
to drink and use.
- I see these drought periods
as an opportunity, actually,
to rethink the way we use our resources.
- [Narrator] One solution
might be found in our toilet.
By transforming waste
water, into drinking water,
something called direct potable reuse.
It might sound gross.
- There's kind of that yuck factor.
People think, oh, I
don't wanna be drinking
my neighbor's toilet water, right?
And that's not true.
- [Narrator] And that's
because that wastewater,
from your neighbor's
toilet or your kitchen sink
is sent to a treatment plant
where contaminants are removed.
Then the water's pushed through filters
that allow only water molecules
through, no impurities.
- We can recover about
70 to 80% of the water
that comes into our system.
- [Narrator] The question
is, can we clean up
that remaining 20 to 30%?
- One of the things that we're looking at
are some other advanced technologies.
- [Narrator] Kerri Hickenbottom's
team is using solar power
to remove those contaminants
by evaporating the water,
leaving behind salts and other gunk.
The water vapor can then be
recondensed into a liquid.
- We're able to take
the energy from the sun
and directly use that to produce
a very high quality source of water.
- [Narrator] This process can recover
almost all of the remaining wastewater.
It's a promising solution,
especially in remote locations,
like among Native American Nations.
- And we have a lot of tribal communities
such as the Navajo Nation in Arizona,
that doesn't necessarily have
access to high quality water.
- [Narrator] With Kerri's
purification system,
these communities could
sustainably maintain
their water supply.
And besides high-tech
solutions like this one,
there's also low tech
things that we can all do,
like just using less water.
In fact, increased media coverage
of the California drought last year
actually changed people's behavior.
- Every one of these
droughts have led into change
in the way we do things.
And I think this is a great reminder to us
that everything that we have around us,
we should not take it for granted.
I look at droughts as an
opportunity to learn, adjust,
and adapt and be better at
the way we use our resources.