This is a simple, inexpensive method for determining
permeability of soils. The Double Ring Infiltrometer is
the only EPA approved instrument of its kind available
The infiltration rate is controlled by the least
permeable zone in the subsurface soils. With the Double
Ring Infiltrometer, it is easy to test several areas of a
large tract to find the infiltration rate. It also
provides comparative information that is useful for
determining erosion rates, leaching and drainage
efficiencies, irrigation patterns, and rainfall runoff.
The instrument consists of two concentric rings,
driving plate, with handles, for inner and outer rings.
The outer ring is 24" diameter; the inner ring 12"
diameter. The two rings are driven into the ground and
partially filled with water. The double ring design helps
prevent divergent flow in layered soils. The outer ring
acts as a barrier to encourage only vertical flow from the
The water level is maintained for a specific period of
time, using the mariotte tube, depending on the type of
soil and permeability level. The volume of water needed to
maintain a specified level and the time factors are
recorded. This information is converted into a specific
infiltration rate using the data sheet provided with the
Each Mariotte tube includes a clamp, clamp holder, 30"
long spike rod and 12 ft. length of 1/4" tubing.
The Mariotte Tube is individually calibrated and is
graduated from 0-3000 ml in 50 ml subdivisions which are
easy to read.
Basic Double Ring Infiltrometer Kit which contains
double ring infiltrometer cylinders with lid and 3000ml &
10,000ml Mariotte tubes.
Double Ring Infiltrometer Kit
A complete Double Ring Infiltrometer Kit, meets all
requirements of ASTM Standard D3385. This kit contains
Infiltrometer with components shown above plus a 12 lb.
sledge, wood anvil block, 6 foot steel measuring tape,
shovel and trenching spade, 3" hand auger, water pail,
stopwatch and carpenter's level.
Complete Infiltrometer Kit
Small Mariotte Tube - 3000 ml
Large Mariotte Tube - 10,000 ml