Piezometer Installation

Coupled with Rotary Core Drilling, we offer Piezometer Installation. The simplest instrument for measuring pore water pressures in ground is an open standpipe. This is a small (usually 20mm) diameter plastic pipe with a porous section at the bottom. The pipe is installed inside a borehole and the porous section is positioned at the depth where the pore water pressure is to be measured. The annulus between the porous filter and the borehole is filled with sand, the top and bottom surfaces of the sand are sealed with bentonite and the rest of the borehole is filled with a cement/bentonite grout.The pressure of the ground water pushes water into and up the standpipe until the level of water inside the standpipe (h) is equivalent to the pore water pressure in the ground at the elevation of the porous filter.