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MPD Infiltrometer
Modified Philip-Dunne (MPD) Infiltrometer


(4 minute video)


Upstream Technologies MPD Infiltrometer, automates the MPD ASTM STANDARD D8152 for calculating Field Hydraulic Conductivity (Ksat).

By automating this standard, human error is removed and since the calculations and report generation are fully automated by software, summer interns and technicians can easily perform these tests in the field, (Engineer not required).

Because it is a falling head test, it requires much less water (only 3 liters per test) and can be performed in a fraction of the time required for other methods. This allows more tests to be conducted to account for soil and ground variability, producing a site-wide average of all tests.

Having a site-specific Ksat value improves the design of infiltration practices, allows verification of construction of these practices, and provides hard data for required annual inspections.

This method replaces the double ring infiltrometer test for saturated hydraulic conductivity (Ksat), for design and monitoring of stormwater infiltration practices.

Economics

MPD InfiltrometerDouble Ring Infiltrometer
Test Time: 30 to 60 MinutesTest time: 4 to 6 hours
Under 1 gallon of waterHundreds of gallons of water required
AutomatedManual - Labor Intensive
Any person can operateRequires a Licensed Engineer
As low as $15 per test$1,000+ per test
Average multiple tests per siteSingle data point for entire site
All data collection and mathematical processing performed automaticallyHuman error
Immediately download a standardized site reportSpend hours calculating and generating a report



MPD Documents

MPD Login

MPD Brochure (PDF)

Sample MPD Report

MPD Demonstration Video

MPD App Guide

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Technical

ASTM STANDARD D8152

What is Ksat? (PDF)

MPD - Double Ring Comparison (PDF)

MPD Accuracy (PDF)

MPD Explained (PDF)


Research Papers

MPD performance vs other methods (PDF)

MPD Saturated Conductivity Surface Soil (PDF)

Field Infiltration Measurement (PDF)

Math used to calculate site wide weighted average of multiple MPD tests across a site


CIP for Infiltration

Capital Improvement Planning
for Infiltration BMP's




ASTM Standard D8152 defines the methodology for performing a manual MPD test. This method is in the Public Domain.

Upstream Technologies has automated this ASTM standard allowing anyone to perform this test.

Upstream Technogies has patented this automation.
U.S. Patent #10,739,242


Engineers

Use the MPD infiltrometer to provide a site-specific Ksat for design of infiltration practices. No more relying on vague ranges provided by soil surveys! Also use it to quickly verify the construction of these practices before authorizing payment to the contractor.



Public Works

Perform annual Ksat tests on all of your agencies rain gardens, infiltration basins, and swales. Easily monitor any changes in infiltration capability over time.


History

The MPD methodology and calculations have a long history dating back to 1911 with the Green-Ampt theory for estimating infiltration, which incorporates many variables that other methods, such as Darcy's Law, do not. Some of these variables include: Soil Suction Head, Porosity, Hydraulic Conductivity and Time.

Two men, Philip & Dunne, then furthered this research and developed a methodology that incorporated the use of a cylinder, filled with water and measured head drop over time. The subsequent math equations incorporate the Green-Ampt theory to predict the field saturated (or steady state) infiltration rate, also known as Hydraulic Conductivity. Philip and Dunne published their methodology in 1993 for peer review.

The University of Minnesota modified Philip & Dunne's work with a variation to the equation in 2007, renaming the method: Modified Philip Dunne or (MPD). This method has been peer reviewed and vetted in the world-wide academic and scientific communities since 2007, becoming an ASTM STANDARD D8152 in 2018.

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SAFL Baffle: U.S. Patents: #8715507B2, #8663466B2, #9506237B2, CANADA Patent: #2742207
SKUNK Garbage Trap: U.S. Patent #10,408,242
Automated MPD Infiltrometer: U.S. Patent #10,739,242