User:Argyriou/piezometer

references:
 * EM 1110-2-1913
 * http://www.efm.leeds.ac.uk/CIVE/CIVE1400/Section3/bernoulli.htm
 * http://pubs.acs.org/doi/abs/10.1021/ac50119a017
 * http://www.rstinstruments.com/PIEZOMETERS.html