Deep Lysimeter

A deep lysimeter, comprising:

• a body including an inner surface having a diameter, a first end, and a second end, and defining a chamber;
• a plate having a first surface, and a second surface secured to the second end of the body and having an aperture therethrough;
• a fill tube including an outer surface having a diameter, a first end, and a second end, the diameter of the outer surface being less than the diameter of the inner surface of the body, the first end of the fill tube being in fluid communication with the chamber via the plate aperture, the fill tube extending into the chamber such that the second end of the fill tube is between the plate and the first end of the body;
• a spacer having a first surface, and a second surface secured to the first surface of the plate, the spacer having an aperture therethrough;
• a semi-permeable member mounted to the first surface of the spacer, wherein a cavity is formed bounded by the semi-permeable member, spacer, and plate;
• a screen supported within the cavity to filter liquid entering the chamber;
• a cap sealing the first end of the body, the cap having an aperture in fluid communication with the chamber;
• and
• a line connection structure secured to the cap whereby the lysimeter may be retrieved from the sampling location.