This project involved the evaluation of some configurations of pavement subsurface drainage systems, including
the conventional edgedrain system, and two centerline configurations, at 2-foot and 4-foot depths. Testing of these
configurations took place on a newly constructed eight-mile section of Nobles County CSAH 35 near Worthington.
Drained roadway sections were 500 feet long for each drainage treatment. Each of the treatments was replicated six
times, with the outflow for each replication outlet through a tipping-bucket flow monitoring system. The
experimental design tested both the drain configuration and the effect of relative elevation of the roadway.
Measurement of relative wetness of the pavement base and subgrade materials for each of the drainage treatments
was conducted with a Geonics electromagnetic induction instrument (EM38). Data were collected from March
2006 until November 2008, with breaks during the winter periods. Statistical analyses were conducted to look for
treatment effects, using both drained volumes as well as the EM38 measurements as measures of drain efficacy.
Additional project work included a finite element analysis of the drainage configurations, EM38 evaluation of
drainage effectiveness of an open-graded base construction for streets in the city of Worthington, and evaluation of
the potential drain plugging effect of crushed concrete fill.
Canelon, Dario J.; Nieber, John L..
Evaluating Roadway Subsurface Drainage Practices.
Minnesota Department of Transportation.
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