Stormwater Symposium

Oral

397952 - A new comprehensive framework to evaluate the hydrologic behavior of Green Infrastructure: a case study in Chicago

Tuesday, June 5
8:30 AM - 10:00 AM
Location: Mirage Room
Co-Authors: Arthur Schmidt, 2524 Hydrosystems Lab, 205 N. Mathews, Urbana Illinois 61801 – University of Illinois at Urbana-Champaign

Green Infrastructure (GI) has been proved to provide various hydrologic benefits to urban systems. Previously, these benefits have been evaluated mainly by using design storms to calculate the resulting total volume reduction, peak discharge reduction, and the reduction in time to peak. As a comparison, this paper develops a new framework to evaluate the hydrologic benefits of GI in a more comprehensive way. Using long-term climate data, analysis should be conducted under a wider range of time scales from annually to sub-hourly to fit benefits of GI that are of interests in different fields. Distinct indices and statistical methods can be used depending on the characteristics of the behaviors at different scales. A case study in a small urban catchment in Chicago metropolitan area has been done using this framework to evaluate the hydrologic benefits of implementing GI under a 12-year climate record from 2000 to 2012, with flow duration curve analyses using L-moments method applied at annually to daily time scale and sign tests applied at hourly time scale. The results show that under various time scales, GI has valuable hydrologic behaviors that are of different magnitudes in variant frequency ranges of runoff, which have been ignored when using classic evaluation methods.

Ariel Kexuan Wang, PhD Candidate

Graduate Research Assistant
University of Illinois At Urbana-Champaign

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