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ii This work seeks to quantify the impact and effectiveness of green infrastructure practices, specifically bioretention cells and porous asphalts, for the reduction of peak flow and volume of stormwater that discharges into the headwaters of the Sand River watershed in Aiken, SC. Stormwater runoff flows and volumes were monitored in the upper Sand River watershed that includes the urban Aiken area, along with two nested subwatersheds, prior to, during, and after the construction of the bioretention cells and porous asphalt sites. Flow data from these monitoring stations were analyzed and the data suggested that there was no significant reduction in volume of stormwater exiting the Sand River watershed. However, there was a significant reduction in the volume of stormwater exiting the subwatershed with a bioretention cell under wet conditions, and there was also a significant reduction in the volume of runoff for the control subwatershed under dry and wet conditions. Selected bioretention cells and porous asphalt sites were monitored to determine their as-built performance compared to their designed performance. One bioretention cell located along Park Avenue betwee