Request Quote | Specification Sheet | FAQ | Reference List

Guelph Permeameter

Introduction

A fast, accurate, easy to use instrument to measure in-situ hydraulic conductivity

Complete, lightweight, can be hand carried to the field and easily assembled
Requires only 1 person and 2.5 litres of water. Measurements can be made in a half hour to two hours, depending on soil type.
Versatile - for use in a variety of disciplines requiring quantified knowledge of soil water relationships.
Provides accurate evaluation of soil hydraulic conductivity, soil sorptivity and matric flux potential in all soil types
The Constant Head Well principle used is based on years of theoretical research and practical field tests

Features

Simple design assures easy field service-ability
All parts constructed of durable corrosion-proof materials for years of rugged field use
Packed as a complete kit in a durable foam lined case can be easily transported to the site as hand carried luggage
Design facilities investigation of the spatial variability of soil conductivity
Accessory extension tubes allow easy adaptation for deep soil applications such as profiling permeability differences due to stratification or compaction.

Theory

When a constant well height of water is established in a cored hole in the soil, a "bulb" of saturated soil with specific dimensions is rather quickly established. This "bulb" is very stable and its shape depends on the type of soil. Once the unique "bulb" shape is established the outflow of water from the well reaches a constant value which can be measured. The rate of this constant outflow of water, together with the diameter of the well, and height of the water in the well can be used to accurately determine the field saturated conductivity of the soil.

Making a Reading

Never before has making a reading for hydraulic conductivity in the field been so easy. Easily assembled in the field from a portable kit, the unit requires only 2.5 litres of water to operate. An auger is provided to excavate a well at the desired location. After installing the Guelph Permeameter in the well, the first constant hydraulic head label is selected by adjusting the air inlet tube on the constant head device. By recording the rate of fall on the reservoir water scale, the steady state flow rate can be observed and noted. A second constant head level is then selected and the steady state flow rate recorded. The hydraulic conductivity, soil sorptivity, and soil matric flux potential can then be quickly calculated. The whole process takes half an hour to two hours, depending on soil type.