In a Waterloo System the casing is sealed off at multiple levels using packers and a base plug. This creates a string of different screening intervals with fixed ports at precise monitoring zones which allow water in at that point but no where else along the length of well casing. A tube is attached to each port which individually connects that zone to the surface. The tubing acts as a miniature well (piezometer) into which the formation water enters via the port and equilibrates at its static level. With this system, at any given time at the surface manifold, one can have access to as many as 24 zones down the monitoring well.