Active substances: Norfloxacin
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The scheme 1, also called the standpipe test, did not require a borehole to be drilled as the pipe was merely inserted directly into the substrate, which can save much time compared with schemes 2 and 3.
Also, excavation of a borehole could be a disturbance to porous medium.
As a disadvantage, this method did not allow to evaluate horizontal Ks. This could be not a problem for isotropic gravel clean or not clogged gravels but, given that the clogging process is likely not to be isotropic, vertical Ks values obtained by this method could be different from horizontal ones.
On the other hand, to our knowledge, a scheme for predicting also horizontal Ks using a P permeameter and that does not require a borehole to be drilled was not proposed. Thus, scheme 4, which implies the use of P permeameter with gravel inside was also implemented.