Evaluating Roadway Subsurface Drainage Practices - Phase II

Project status

Completed

Start date: 06/10/13
End date: 08/31/15

Researcher(s)

Principal investigators:

Co-principal investigators:

About the research

The primary objectives of this Phase II research are as follows:

  • Evaluate seasonal variation effects (dry Fall 2012 versus wet Spring/Summer 2013, etc.) on subdrain outlet condition and performance
  • Investigate the characteristics of tufa formation in Iowa subdrain outlets (i.e., identify the factors influencing the tufa formation and prevention, at what stage does tufa formation start influencing subdrain outlet performance, etc.)
  • Investigate the condition of composite pavement subdrain outlets
  • Examine the effect of resurfacing/widening/rehabilitation on subdrain outlets (e.g., the effects of patching on subdrain outlet performance)
  • Identify a suitable drain outlet protection mechanism (like a headwall) and design for Iowa subdrain outlets based on a survey of nearby states

Publications

Report: Evaluating Roadway Subsurface Drainage Practices - Phase II (10.23 mb pdf) May 2015

Tech transfer summary: Evaluating Roadway Subsurface Drainage Practices - Phase II (1.24 mb pdf) May 2015

Sponsor(s)/partner(s)

Sponsor(s):

  • Iowa Department of Transportation
  • Iowa Highway Research Board