Stormwater Symposium

Oral

376552 - Bioswale design optimization for enhanced application and pollutant removal

Tuesday, June 5
10:30 AM - 12:00 PM
Location: Mirage Room
Co-Authors: William Hunt, Raleigh, NC – North Carolina State University; Ryan Mullins, Raleigh, NC – North Carolina Department of Transportation; Brian Lipscomb, Raleigh, NC – North Carolina Department of Transportation; Karthik Narayanaswamy, Morrisville, NC – AECOM; Andrew McDaniel, Raleigh, NC – North Carolina Department of Transportation; Matthew Lauffer, Raleigh, NC – North Carolina Department of Transportation

Swales are a very common stormwater control measure for conveyance, making them a potential treatment device within North Carolina Department of Transportation’s (NCDOT) linear right-of-way. Currently, swale performance with respect to hydrologic change and pollutant retention is assumed to be modest, but initial NCDOT-funded research on hydrologic condition and the presence of check dams yielded results that show the potential for design improvements.
The purpose of this project is to test multiple design parameters of bioswales in controlled plots and field settings. The design parameters are slope, length, and presence of check dam. Trials will be completed using simulated rainfall events, with and without pollutants. Pollutants include phosphorus, nitrogen, total suspended solids, and metals (Cu, Pb, Zn, Cd). Tests without nutrients serve to determine the interaction between the design parameters and when surface flow becomes subsurface flow. Pollutant-spiked tests will be run to quantify swale and bioswale nutrient removal efficiency. Field studies will be ongoing and conducted on bioswales in two physiographic regions (Piedmont and Coastal Plains).
Initial findings show that bioswales do allow for peak flow and volume mitigation, with some flows resulting in no surface runoff. Hydrology and water quality data will be statistically analyzed to determine significant behaviors under various design criteria. An Excel-based tool will be created to allow for the designing of a bioswale and reporting predicted behavior.
Bioswales are an important SCM, but currently there is little data showing their significance. This work and talk will highlight the positive impacts of implementing a bioswale.

Rebecca Purvis, MS

PhD Candidate
North Carolina State University

Presentation(s):

Send Email for Rebecca Purvis


Assets

376552 - Bioswale design optimization for enhanced application and pollutant removal



Attendees who have favorited this

Please enter your access key

The asset you are trying to access is locked. Please enter your access key to unlock.

Send Email for Bioswale design optimization for enhanced application and pollutant removal