See  http://www.british-hydro.co.uk/download.pdf
<http://www.british-hydro.co.uk/download.pdf>for a 31 page mini hydro manual
(ref from Alan's link below).
Not overly technical, but some useful stuff.

Most use of all to storw in brain:

Rectangualr weir flow rate

Flow = 1.8 (L-0.2h). h^1.5

         Flow m^3/sec
         L = width in m
         h = water height over weir  in m

Translates into other units in expected manner.
Note this is a simplification of

 Flow = 2/3 Cd sqrt(2g)(L-0.2h)h^1.5
See report for details.

Available power from hydro typically 60%-70% of gross available energy

= eg   kW = m^3/sec flow x m head x 6            (60% efficient)


       Russell





On 8 July 2010 23:23, <alan.b.pearce@stfc.ac.uk> wrote:

> > Found this page while looking for something quite different (as often
> > happens)
> > Liable to be of at least passing interest to many.
> > Possibly even of unexpected practical use to some.
> >
> >
> > http://www.cs.drexel.edu/~crorres/Archimedes/Screw/Applications.html
>
> They are being used for power generation in the UK, a reverse use to
> what they are normally put to.
>
> e.g. http://www.westernrenew.co.uk/Archimedes%20screw%20turbines.html
> http://news.bbc.co.uk/1/hi/england/cornwall/7586285.stm
>
> Also referenced here under 'turbine types' ...
> http://en.wikipedia.org/wiki/Micro_hydro
>
>
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