Whether it is designing a plumbing system or grilling a steak, there are always options. Some options become available because of different conditions, others result from the advent of new solutions or technologies, others still, simply preference.

Regardless of the choice of options we make and/or why we make them, any reasonable person would agree on two things:
* There is no ‘absolutely perfect’ system that will never have a problem under any circumstances
* There is no such thing as the ‘best solution’ only the ‘best solution we are aware of at the time we make our choices’

When it comes to designing plumbing systems, for the past several decades the science behind our engineering calculations, albeit modified, has basically been Hunter’s curve which dates back to the 1920s. The most recent study (up until now) was done in the 60’s but still using cold, suds-less water as the test medium.

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