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Case Study: Installation and Monitoring of Green Infrastructure Stormwater Controls in Louisville, Kentucky - slides
Citation:
Brown, R., Mike Borst, H. Kazemi, J. Gray, AND L. Kurtz. Case Study: Installation and Monitoring of Green Infrastructure Stormwater Controls in Louisville, Kentucky - slides. Presented at ASCE-EWRI 2012 World Environmental and Water Resources Congress, Albuquerque, NM, May 20 - 24, 2012.
Impact/Purpose:
EPA's capability to remotely monitor hydrologic processes in green infrastructure stormwater controls using embedded moisture and water level sensors was documented, and an outcome was that remote monitoring was used to determine maintenance frequency.
Description:
In 2005, the Louisville and Jefferson County Metropolitan Sewer District (MSD) entered into a Consent Decree with the U.S. Environmental Protection Agency (EPA), Kentucky Department for Environmental Protection, and the U.S. Department of Justice. MSD committed to monitor the performance and effectiveness of the green infrastructure stormwater controls to assure ongoing reductions of stormwater volume entering the system. MSD will base later decisions to incorporate green infrastructure into the plans based, in part, on monitoring results of initial installations. An early set of installations is located in CSO basin #130, an 11 ha (28-acre) sewershed. The solution to meet the regulatory targets for this basin was an entirely ‘green’ approach – 17 permeable pavement strips (permeable articulating concrete blocks) and 29 tree boxes. A subset of these controls (six permeable pavement strips and six tree boxes) will be instrumented with time domain reflectometers, water level sensors, thermistors, and passive capillary lysimeters at various depths in the profile to evaluate the infiltration processes and the overall hydrologic performance of the individual controls. In December 2011, the first two permeable pavement strips with trenches were constructed, and both were instrumented with the previously described monitoring equipment. As an additional measure of hydrologic performance, surface infiltration rates for the permeable pavement strips are measured at least quarterly and immediately before and after maintenance. The presentation of this case study will provide an overview on the design, construction, and monitoring used to evaluate these controls, and preliminary data from ongoing monitoring will be presented.
