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The Louisville Metropolitan Sewer District (MSD) has entered into a Consent Decree Agreement with U.S. EPA to reduce the number and volume of combined sewer overflows (CSOs) from the existing combined sewer system (CSS). As an aspect of this agreement MSD is using green infrastructure (GI) stormwater controls to reduce CSOs. The initial phase of the project is implementing GI controls in a small urbanized neighborhood (28 acres) in Louisville, KY, in lieu of a planned concrete retention basin. In December 2011, two permeable interlocking concrete pavement (ICP) controls were constructed. To quantify surface infiltration and subsurface exfiltration performance each control was embedded with time domain reflectometers (TDRs), thermistors, and piezometers. To predict the hydrological performance of the GI controls, a spreadsheet model is developed by utilizing each control's drainage area, hydraulic …