Timothy Wright – MS Defense Announcement
Retrofitting LID Practices Into Existing Neighborhoods: Is It Worth It?
Monday, April 14, 2014
1:30 p.m. ABE 301
Ecological Sciences and Engineering
Agricultural and Biological Engineering
Low impact development (LID) practices are gaining popularity as a way to manage storm water close to the source. This reduces infrastructure requirements and helps maintain hydrologic processes close to predevelopment
conditions. Studies have shown LID practices are effective in reducing runoff and improving water quality. However, little has been done to aid decision makers in selecting the most effective practices for their needs and budgets.
To this end, the L-THIA LID model has been applied. Using readily available data sources, multiple scenarios can quickly be examined, and then analyzed to determine the cost of implementation and the approximate
period needed to see a return on the investment. This has been demonstrated by modeling four neighborhoods in greater Lafayette, Indiana to estimate runoff reduction that could be achieved through retrofitting LID practices. Based on LID practice cost of implementation,
the payback period was determined for each practice. Depending on the LID practice and adoption level, 10 to 70 percent reductions in runoff volumes could be achieved. Cost per cubic meter of runoff reduction was highly variable depending on the LID practice
and the land use it was applied to, ranging from around $3.00 to almost $600.00. In some cases the savings from reduced runoff volumes paid back the LID practice cost with interest in less than 3 years, while in other cases it was not possible to generate
a payback. This information can help decision makers establish realistic goals and make informed decisions regarding LID practices before moving into detailed designs, thereby saving time and resources.
This research is meant to provide information and methods that can be used by decision makers to make informed high level decisions about the costs, benefits, and performance of LID
practices as an alternative to traditional storm water management methods.
Christal Musser
Program Coordinator
Ecological Sciences and Engineering
Office of Interdisciplinary Graduate Programs
The Purdue University Graduate School | Purdue University
Ernest C. Young Hall, Room B-40 | 155 S. Grant Street | West Lafayette, IN 47907
Email:
musser@purdue.edu | Web:
www.purdue.edu/ese
Phone: 765-494-2102 | Fax: 765-496-6271
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