Why water infrastructure

Somehow history of human begins with water.  Ancient civilizations developed near water resources like springs, lakes and rivers, which were sources of clean water on that time. All of us heard about great civilizations on the bank of Mesopotamia, Nile rive and Indus river. 

Water has a huge impact on human history and having clean and safe water always has been a big concern and will be. In arid areas people knows the value of water and they did very interesting works to bring water to their home. They dig water wells and Qanats and much of the population in that areas depended directly to this water. One of the oldest and largest known Qanat is in Iran and still after 2,700 years providing drinking and agricultural water to nearly 40,000 people. Also there is a two story Qanat in Ardestan which is constructed 800 years ago and has 60 l/s flow.

In the picture you can see a Qanat in Hormozgan province from Sassanid era.

Besides drinking water and using it for cleaning and aggregation, human tried to use water for other purposes. To providing energy like watermills, to having cool flow in windcatchers, for measuring time and ....

In the pictures below you can see water clock and the clay tablet for water clock calculations from Babylon period.

Beside of these, there is a great history on dams and how human tried to reserve water for his future. 

Blow is the picture of the Saad El Kafara dam which is built by ancient Egyptians around 2650 BC.

 I will try to have a post about dams later.

Beginning ...

Did the world have a beginning?

Where is the origin? Which one is true: the Big Bang Theory or the Steady State Theory?

I don't know about that but I know this blog started at a single moment with the a blast and growing in time and space!

I'm a graduate student and I began this blog for several purposes. First of all, to keep track of what I'm doing. Having spreadsheets and tables in word is good too, but here I can reach the content all the time and also since I was blogging before, for me is more incentive to write and write and write. In addition, I will try to link useful papers, websites, blogs, ... so for me its easier to cite them here for future use. Moreover, I can get others opinion about topics I am posting. Finally, blogging is fun and helps to think better I think!