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Lecture 7

ENV200H1 Lecture Notes - Lecture 7: Water Cycle, Water Efficiency, Water Scarcity

School of Environment
Course Code
Romila Verma

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ENV200 Lecture 7
Water Resources
Water is essential for life, dissolve nutrients, distributes them to cells, regulates body
temperature, removes waste
Needed for agriculture, industry, transportation and other human uses
Cycles endlessly through the environment (hydrologic cycle)
Water evaporates, falls as rain/snow, passes through organisms returns to ocean
Only .02% of water is accessible to us and its unevenly distributed
Water is renewable, but it takes time, need to protect and conserve local water supplies
Aquifiers: geological layers containing water under pours layers
Water use in low income countries is mostly for agriculture
Water use in high income countries is mostly industrial
2/3 of population must get water out outside of their households
Safer water could prevent many deaths
Water scarcity is a problem (Africa and Asia)
Watershed/catchment is the land drained by a stream or river
Water Security
Supply management
Manipulating natural system through augmenting an existing supply or developing a
new supply
Demand management
Influencing human behaviour so that less water is used
Soft path
Aims to improve water efficiency by challenging basic patterns of water consumption
(waterless toilets)
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