Hello Ladies and Gentlemen: How is the going? You might have noticed that I haven’t been on this blog for sometime. But am back! Well may be recession might have played a role! Just kidding am doing just fine :) to quote Suze Orman the Internationally Acclaimed Personal Finance Advisor. Anyways I have to apologize in advance coz I know I will surely be in trouble on this post, I will get some phone calls asking me to explain why on earth I can decided to write on a topic that is purely technical than on a general life experience or episode that we can all exchange ideas and contribute to, and I totally get it. To be sincere I didn’t want to, but you know I love design and at the moment not doing much of it momentarily so it’s a natural inclination for me to read a little bit just to stay current with that stuff especially on Hydrology and Hydraulics (the two most misunderstood terms even by practitioners’ themselves, but that is a whole different story). Anyways, here we go just read a