Talk:Water efficiency

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I'd like to see the concept of water efficiency given mathematical definition on this page. Given that:

"In physics and engineering, including mechanical and electrical engineering, energy efficiency is a dimensionless number, with a value between 0 and 1 or, when multiplied by 100, is given as a percentage. The energy efficiency of a process is defined as

\mathrm{efficiency} \ \eta_E= \mathrm{{power \ output} \over \mathrm{power \ input}} \ (= \frac{\text{work} \ W }{ \text{energy} \ E}) \,

where W is the amount of useful work done by the process (in joules), and "energy" E is the quantity of energy (again, in joules) used to run the process.

Energy efficiency within a closed system can never exceed 100%." (from energy efficiency page)

or

\eta_E = \frac{E_{out\ in\ product}}{E_{input}} = 1 - \frac{E_{lost}}{E_{input}} \qquad \mbox{(3)}

(from exergy efficiency page)


Should water efficiency bsomething like:

\mathrm{efficiency} \ \eta_{H20}= \mathrm{{H20 \ output} \over \mathrm{H20 \ input}}