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global water cycle (potential question (talk about water stress 1,700m…
global water cycle
potential question
talk about water stress 1,700m cubed
also talk about population and the communications between government in trading water
talk about industrial and agricultural use of water.
mention salt water encroachment
climate changes effect
melting ice caps
more water stored as sea water
this is undrinkable
stronger extreme of weather occur more frequently
this can lead to global disasters
such as drought in Zimbabwe and Africa
such as hurricanes in South America.
99.9% of the worlds water is not readily avainable for human use.
this is causing a global water crisis
rivers can bring positives and negatives to a country
they can be a good water supply as they are usually drinkable
they can also bring issues of flooding. especially in urbanised areas.
water is also over used in some areas
these areas include agriculture
one example of this is cotton farming in the Aral Sea
another example go this is inefficient irrigation
the global hydrological cycle is a closed system
this means the water we have now is the same water we have ever had and will ever had
this is why the watery crisis is such a pressing issue
this is because much of our water becomes contaminated by substances such as sea salt and chemicals from pollution
hydrographs
hydrographs are a useful tool when it comes to predicting floods
this is because they can suggest many factors about the flood regarding how powerful it will be, how long it will last and when it can happen
how you can these factors based on the precipitation. how strong it was, sudden it was and how long it lasted. will impact the flood. you also need to consider the terrain the rain fell on to understand the flash flood. sudden heavy rain = sudden heavy flood.
there is a phenominon that causes extrwam weather that can eavily impact the water cycle
el nino occurs in the southern hemisphere and can cause extreme droughts and floods around south america africa and australia.
in zimbabwe 8000 people died because a drought. lots of livestock was also lost due to dehydration.