Measuring bath water depth

["PatrickLidstone" <patrickl@xxxxxxx>]

Campbells post got me thinking again about this - I know that there 
have been various suggestions in the past ranging from strain gauges 
to pressure sensing - but how about ultrasound?

I imagine a water surface reflects ultrasound well. If this is true, 
and the accuracy of an ultrasound tape-measure is reasonable (like 
the kind used by estate agents), ceiling mounted sensors might work 
quite well? Anyone who has an ultrasound rule want to do a quick 
feasibility test?

Patrick

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