-
물은 매우 중요한 요소입니다
인생을 위한 빌딩 블록,
-
농사를 위해, 음식을 위해, 그리고 샤워를 위해.
-
물은 멀리서 오는 경우가 많다
-
예를 들어,
남부 캘리포니아 물의 절반 이상
-
콜로라도 강에서 펌핑됩니다.
-
그런 다음 위로 운반됩니다.
그리고 산맥 너머로
-
도시와 농장에서 사용
-
하지만 비가 내리면서
그리고 온도가 변해요
-
과학자들이 보고 있다
대가뭄
-
미국 서부에서 등장.
-
그리고 장기적인 가뭄의 대부분은
-
콜로라도 강 바로 중앙에 있습니다.
-
LA와 같은 대도시를 의미합니다.
시골 농장도 그렇고
-
물 공급에 압박이 가해지는 것을 볼 수 있었습니다
-
이번 에피소드에서 알아볼 내용은
가뭄이 왜 이렇게 심해?
-
그리고 어떤 교훈이 있는지 알아보세요
우리는 배울 수 있어요
-
가진 사람들로부터
남서부에 살았다
-
수천년 동안
-
배수유역은 지역이다.
-
강수량이 모이는 곳
그리고 특정 수역에 부딪히게 됩니다.
-
콜로라도 강의 유역
-
7개 주와 2개 국가에 걸쳐
-
4천만 명의 사람들이 물을 믿고 있습니다.
-
하지만 강이 마르면 어떻게 될까요?
-
그리고 당신이 믿고 있는 물
오지 않는다
-
To understand, I first asked
-
water and drought scientist,
Brad Udall, what's going on.
-
In 2000, a drought began
that now 20 years later
-
is the most severe drought
-
since gauges were installed on the river
in 1906 in some places.
-
The flow is down about 20%.
-
Drought is usually defined
-
as a period of abnormally low rainfall
-
leading to a shortage of water.
-
But Brad told me
that this drought is a bit different.
-
That's because while rain is down,
-
that doesn't fully account
for the low water levels.
-
We now actually have a new term for this:
-
It's a hot drought.
-
So higher temperatures dry out the earth.
-
And what we're finding is
that higher temperatures
-
lead to greater evaporation
in all its forms.
-
And that evaporation
is the cause of this decline in flow.
-
In other words, as temperatures
increase over time,
-
the process of evaporation
takes more water away
-
from rivers, lakes,
and snow-capped mountains.
-
This helps explain why river flow
in the Colorado basin is down 20%
-
despite precipitation
only being down by 5%.
-
And droughts do end,
-
but according to many scientists
-
waiting for rain in this case
is probably not a good idea.
-
The term "drought" implies
-
some kind of return
to normal at some point.
-
Drought implies temporary,
-
and most scientists nowadays
have started talking
-
about the aridification of the West,
-
meaning a more permanent move
to a dry state.
-
(car engine roaring)
-
Few people understand
the threat of drought
-
better than Nancy Caywood.
-
She's a fifth generation
farmer in Pinal County
-
where water either comes
from the Colorado River
-
through the Central Arizona Project canals
-
or from other rivers and canals
in the Colorado basin.
-
This represents liquid gold.
-
This is our water supply right here.
-
We take it out,
there's a gate right there,
-
and it goes down a little lateral canal
-
that takes it right to our farm.
-
I'm gonna open up this gate,
-
we have the gate open,
-
we'll open four of them,
allow the water to flow in.
-
We have about 135 acres of alfalfa.
-
This is an example of flood irrigation,
-
one of the oldest and most
common irrigation methods
-
which distributes water over the soil
-
by allowing it to flow
downhill with gravity.
-
There's a beautiful simplicity to it,
-
but it's actually the least
efficient way to irrigate
-
as much of the water
either evaporates away
-
or seeps into the soil
out of reach of the plants' roots.
-
And on top of that,
alfalfa is a very thirsty crop,
-
which means the beef
that comes from the cattle it feeds
-
is the highest water use food
commonly available.
-
Drip and sprinkler irrigation
can be much more efficient,
-
but Nancy told us she's not been able
-
to get the permits needed
-
to change the irrigation style
on the farm.
-
And the Caywood alfalfa
fields are in good company.
-
60% of farmland in the Colorado basin
-
is used to grow feed crops.
-
Combine all that demand,
and here in Pinal County
-
is where the drought hits home.
-
The last time the reservoir
was full was in 1992.
-
One year, we had nothing
planted on this farm at all.
-
In 2019 water in Lake Mead,
-
the nation's largest
reservoir, dropped so low
-
it triggered the first cutbacks
-
in water allocations ever in the basin.
-
Pinal County farmers were the first
-
to have their water reduced.
-
Fields lay fallow, prepped
and ready, but unplanted.
-
This is a fallow field,
-
and we just didn't have
enough water to plant it.
-
We have 120 acres of fallow land.
-
Good news here is, since about 1980
-
American water use has actually gone down.
-
Even in growing American
cities in the South West,
-
total consumption has gone down
-
despite pretty big increases
in population.
-
But worldwide irrigated agriculture
-
uses upwards of 70% of water in rivers
-
and municipalities use
much, much less, 20% or less.
-
That's partially due
-
to household water conservation efforts,
-
but it's mainly due to the way
cities and homes use water.
-
When you shower, wash dishes
or even flush the toilet,
-
that water is treated and returned
to surface or groundwater
-
rather than evaporating.
-
The same goes for some industrial uses.
-
But the largest opportunity and challenge
-
to reduce water use
is in the agricultural sector.
-
That's because water used for farming
-
either becomes part of the growing plants
-
or it's lost to evaporation,
-
meaning it doesn't return
to the hydrologic cycle
-
for a very long time.
-
Scientists say this is
the worst drought in 1200 years,
-
but the Hopi you have lived in this area
-
for over 2000 years
and have grown food through it all.
-
We met up with Max Taylor,
a Hopi Water Resources technician
-
to find out if lessons
from one of the oldest communities
-
in the United States
can be applied to modern life
-
in the drying Colorado basin.
-
The Hopi's been known
to use the least amount of water
-
than people throughout
the whole United States.
-
It's just because we live in the desert,
-
here we are more aware
of how much you use.
-
And so the use is very little.
-
So we're down at my field.
-
This is my blue corn,
they're planted here.
-
All of these are dry farmed.
-
I don't do any irrigation.
-
And the technique we use is
you clear off an area.
-
You'll dig a hole down
about maybe eight to 10 inches deep,
-
get maybe eight or ten kernels of corn
-
and toss in there.
-
The wet moisture that you've taken up,
-
you push them back in,
-
then you cover it with the dry soil.
-
And that's dry farming.
-
His garden is planted in a low lying area
-
to collect the little moisture
that falls each year.
-
And his crops are
extremely adapted to the region.
-
They're planted far apart
to avoid competition for water,
-
and they grow very deep roots
that tap into groundwater.
-
Right now we're in September.
-
You can still feel a little bit
of moisture in the ground,
-
see that?
-
Not much, but just enough
that it's still keeping them going.
-
Amazingly Max uses seeds
for his own farming consumption
-
that produces crops
in what seems like dust
-
with no irrigation.
-
He's never watered this field.
-
We have seeds that are being passed on
from generation to generation.
-
So they're adapted to this dry climate.
-
The corn's been with the Hopi
at least several thousand years.
-
I think the lesson to learn
-
is that you have to live
within your environment.
-
And I think that's how the natives
have survived in these areas
-
because they were sustainable.
-
And we know this country.
-
Shifting towards crops appropriate for
-
and adapted to their environment
-
provides a vast opportunity
for water conservation.
-
That shift can happen
on farms or in cities
-
when we choose to eat foods
that need less water to grow.
-
On paper, a shift from feed
crops and cattle makes sense.
-
But if we want to adapt
-
to our warming climate
in an equitable way,
-
we can't write off farmers
like Nancy and the families
-
that have fed us for generations.
-
We would like to continue farming.
-
We don't plan on giving up this farm.
-
We are looking into alternatives,
-
we're looking into alternative crops,
-
we're looking at water conservation
irrigation techniques.
-
Alfalfa takes seven to nine acre feet
of water a year to grow it.
-
Olives would take about
one and a half acre feet of water.
-
But if we were to get into, say, olives,
-
there'd be a lot of soil preparation.
-
So it costs us a lot money to get started.
-
But the question is,
can we come together as a country
-
and implement techniques
to reduce the strain
-
on our water supply
before there are even more shortages?
-
We need to be ready
-
for some really big changes coming at us
-
that are frankly
outside of our comprehension.
-
This is how we make the best
out of a bad situation
-
and stand by those
-
who end up facing
the biggest changes and challenges.
-
And while we focus
-
on the American Southwest in this episode,
-
drought does affect
almost every part of the country.
-
So practicing water conservation
-
as a part of your daily life
can help you prepare
-
for when water supplies
run low in your region.
-
Some of the most effective
things you can do today
-
are not that hard.
-
For example, never leave a faucet running
when it's not being used,
-
like when brushing your teeth
or washing dishes.
-
Make sure to fix leaky faucets
-
and choose energy-
and water-efficient appliances.
-
If you want to get more involved,
-
you can place a brick
in the tank of your toilet
-
so it uses less water for each flush,
-
or convert your lawn
to a beautiful landscape
-
that doesn't need irrigation.
-
Or even install
a rainwater catchment system.
-
Of course, there's another
thing we can all do,
-
and that's to fight the underlying cause
of this drought, climate change.
-
The future of this drought is unwritten,
-
and the less warming we create,
-
the brighter our water future will be.
-
So check out the excellent show, Hot Mess,
-
for more ideas about what can be done.
-
And of course, subscribe
-
to keep up with all of our
episodes of Weathered.
-
(soft music)