(B.Tech, CPEng(Ret), MIEAust)Hi there, I've spent well over 20 years as an Hydraulic Engineer designing pipework for buildings, and almost a similar amount of time as a Site Engineer in major construction.Some of my more well known hydraulic projects include all the hydraulics for Wet and Wild water theme park, All of Sanctuary Cove including the Hyatt Regency, Seaworld Nara Resort, Australia Fair Shopping Centre, Golden Beach resort, Alexandra beach Resort, and of course many many others.During this time, I researched all sorts of formulas on box gutters, eaves gutters, down pipes, storm water, water pipe sizes etc, that complied with the Australian Plumbing Code AS/NZS 3500. and eventually I created programs to make the job easier, and especially quicker. Now with a couple of clicks, you too can master the Plumbing Code.These programs are now free to use on the internet.http://www.roof-gutter-design.com.auhttp://www.waterpipesize.com.auSo.... My programs are now free to use. If you take a look you'll find they will save you a heap of design time. There is also a lot of notes, theory and explanations on the Plumbing Code. And the best thing is, they give the same results as the plumbing code with only a few clicks.I originally wrote these tools, so that Architects and Designers could find out all the answers, and do all the “what if’s” themselves, in the hope that this would (get me off the phone) and allow the building designer to get the building sorted before passing it to the Hydraulic and Structural Engineers, for further design and certification.I am also hoping that this will save everyone on the design team a lot of agro.I also conduct workshops on all things "Stormwater" for building sites, with the Engineering Training Institute Australia. (ETIA).Enjoy.http://www.roof-gutter-design.com.auhttp://www.waterpipesize.com.au