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Saturday, August 16, 2008

Rain harvesting

Well, Rain harvesting ,
what is it?
It is a method by which , all the rain that fall on a given land surface could be smartly collected before it falls on the earth surface .
What happens to rain water normally?
Usually most of the rain water that falls on the earth just flows off to areas on the surface that are already polluted and in the process,gets contaminated.This contaminated rain water  is  not potable or usable as drinking water anymore.
Also,most of the rain water gets washed off to the sea and immediately stops  being FRESH WATER once it enters the sea.
Rain water that falls on the rivers is ofcourse usable but given that so many regions actually let out insdustrial waste and raw sewage into rivers without treatment,this is a lost cause as well.

Some rain water gets soaked up by the earth surface and trickles down to ground water.This is the only place where rain water actually directly helps REPLENISH water sources underground.

What is rainwater harvesting?

Rainwater harvesting is the process of COLLECTING AND SAVING water when it rains and use it for later .
This rain water collection must happen from a clean surface , for eg, a clean terrace.
This collected water can then either used directly or stored for later.
If the collected rain water is to be stored,it must first be filtered and slightly treated prior to storeage.

Sometimes,the excess rain water can be safely let into a safe groud water hole that would then make sure that the underground water table is replenished  as well.However when trying to re let collected rain water back into an underground well, please FILTER AND CLEAN THE COLLECTED water prior to letting it into underground sources.
UNTREATED RAIN WATER when let into underground wells can CONTAMINATE wells.

so,yeah,this is what Rain water harvesting is all about.

How does this help us?
Water is necessary for sustainance of life, just like air.humans cannot do without water or air.
With growing booming populations,water demand is on the rise  and water has become a scarce precious commodity.

Rain water harvesting helps us cut each of our water foot print.
I did write a very precise blog entry about water foot print weeks ago.
It helps save water and prevents wastage .

Rainwater if not harnessed might first fall on muddy earth ,get contaminated and then with all its contaminants  flow out into surface water bodies and finally to the sea .

Rains do feed rivers and the soil that gets washed off  into the rivers does get settled off along the water in agricultural fields and deltas and nourish them,
but,most of rain water gets wasted .

rain water harvesting helps us make GOOD USE of water that might otherwise get wasted .

Rain water is the purest form of water much akin to distilled water.Therefore, rain water could actually be consumed as is, if collected directly from the sky without any treatment .

Also, rain water can be collected at a much higher point and then,just like a water stored in a dam is used to produce hydel powered electricity, this water can then be run down from that height and thus can be used to produce electricity too.
So, thus, we can have an energy source from a renewable source.

This blog entry of mine was prompted by all the unseasonal and untimely heavy rainfalls  we had recently.
Why not make hay when the sun shines!
Why not produce hydel electricity if at all it is going to rain like cats and dogs this way all the time..LOL.
I think , Seattle, should go ahead and think of rain water harvesting
and chicago like i mentioned in one of my past blog entries, can go for , wind powered energy.
yeah, Las vegas can go for solar energy too..LOL
there we go, our energy problems all solved.

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