Water
A
good place to start to talk about agriculture is to begin with water. According to World Water Assessment Program, 70%
of water is used in agricultural processes (irrigation), 22% is accounted for
in industrial processes and domestic use accounts for 8%. This would compare to 1940, when 84% of water
went to agricultural processes, 10% to industrial processes and 6% to domestic
uses. Here is another statistic. According to the World Bank water recycling
makes up 4% of the global supply. These
are unbelievable statistics.
Source: World Water
Assessment Program
According
to the World Water Council, the average American uses 600 litres per person per
day, while the average European uses 350 litres per person per day. The UN recommended basic minimum is 50 litres
per person per day. The point to make
here is that agriculture is the largest consumer of water by far and that with
the growing emerging economies, the basic minimum UN usage of 50 litres per
person per day will clearly increase at a very rapid rate to feed these growing
populations.
We,
in the U.S., get our water from several sources: surface, underground and recycled water (not covered here, but will be an increasingly large part of the water picture in the very near future). According to the USGS, 47% of our water comes
from surface water, while 53% of our water comes from underground. Our surface water sources are: lake water
(lakes or reservoirs); river water (where fresh, i.e. not polluted); and
cisterns (small percentage and where appropriate). Our underground water sources are: large well
water installations (usually provided by the county where population density is
large); and small, single well installations in rural areas for farms or homes.
In
a 2005 United State Geological Survey (USGS) study, 67% of the fresh
groundwater withdrawals were for irrigation and 18% were for public
supply. More than 25% of total water
used in the U.S. in 2005 was withdrawn in California, Texas, Idaho and
Florida. California accounted for 11% of
all withdrawals in the U.S. in 2005.
Nearly 75% of the freshwater withdrawn in CA was for irrigation, and 98%
of saline water withdrawn was for thermoelectric-power generation. Below is a map by the USGS showing subsidence
of land, which has been attributed to groundwater pumping. Take a look at the four states mentioned
above. Subsidence occurs in all of
them. Subsidence occurs when withdrawal
exceeds recharge. Therefore, there is a
net loss of groundwater and the aquifer begins to compact or subside due to the
overburden pressure of sediment layers above the aquifer.
The
below chart shows the groundwater level change in Central Valley from 1962 to
2003 and how quickly it has declined without recharge due to the ever increasing water usage in agriculture, required to feed the U.S. and others. Central Valley is located in
California and is the large, long blue blob in the map above. This type of groundwater depletion is
occurring around the U.S., including the Ogallala aquifer in central U.S. (which can be seen above in Nebraska, Kansas, Oklahoma, eastern Colorado, eastern New Mexico and northern Texas) at an alarming rate.
These
are discouraging water results. Fresh
water groundwater depletion will become a bigger and bigger problem as time
goes on. We need food for the growing developing countries, so technological, ecological, environmental, and biological discoveries, developments and investments will and have to occur.
The
above map is the latest drought monitor map from the U.S. Department of
Agriculture. The states that I have
pointed out as major irrigation states are having some sort of drought
condition. Without snowpack or rainfall
this year, this map will darken - bad.
My
next blog will be address agriculture and themes that will be investable. Clearly, water investable ideas are manufacturers
of irrigation systems, water utilities, water filtration companies and water
treatment companies.