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Showing posts with label Irrigation. Show all posts
Showing posts with label Irrigation. Show all posts
Feb 20, 2014
How a mining conflict led to the political emancipation of a community in Northern Greece.
Dec 15, 2013
Permaculture and water catching earth
Forest Hills farm catches rain for irrigation
Long before they heard the word “permaculture,” Forest Hills residents Terry Jo and Dave Bichell had embraced the tenets of organic gardening to create sustainable spaces on their Old Hickory Boulevard farm. Permaculture gave them the tools to overcome drought and flooding.
“Permaculture is a way of growing that uses the land to soak up and store water,” Terry Jo explained. “You use the natural features of the land and plant trees in such a way to hold water, and use plants to help nourish each other without fertilizers.”
The farm is a remnant of a historic plantation, she said, and the land had been used for pasture by previous owners. She was committed to avoiding pesticides or fertilizers, so she set out to see what could be grown on pasture land without alteration. “We grew a crop of hay for a couple of years, because at that time that was about all we could grow without using irrigation and pesticides.”
Oct 27, 2013
Principles of Water Management for People and the Environment
Michael Acreman, Freshwater Management Adviser to the
IUCN, Institute of Hydrology, United Kingdom
Water, the Environment, and Population
Water is the lifeblood of our planet. It is fundamental to
the biochemistry of all living organisms. The planet's ecosystems are
linked and maintained by water, and it drives plant growth, provides a
permanent habitat for many species (such as 8,500 species of fish), and
is a breeding ground or temporary home for others, including most of the
worlds 4,200 species of amphibians and reptiles described so far. Water
is also a universal solvent and provides the major pathway for the flow
of sediment, nutrients and pollutants. Through erosion, transportation
and deposition by rivers, glaciers, and icesheets, water shapes the
landscape and through evaporation it drives the energy exchange between
land and the atmosphere, thus controlling the Earth's climate.
Apart from a few minor chemical processes, water is neither created nor
destroyed, it only moves from place to place and changes in quality. The
total amount of water on Earth is 1.4 billion cubic kilometers
(km3), but only around 41,000 km3 circulates
through the hydrological cycle, the remaining being stored for long
periods in the oceans, ice caps and aquifers. Furthermore, the renewal
rate provided by rainfall varies around the world. In the Atacama desert
in southern Peru it almost never rains, whilst 6,000 millimeters (mm) of
rain per year is not uncommon in parts of New Zealand. In any one place
rainfall also varies from year to year.
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