Abstract
ABSTRACT Infiltrated stormwater from a regenerative stormwater conveyance (RSC) investigated in Knoxville, TN, was found to substantially interact with the surrounding groundwater system. The degree of interaction resulted from seasonal fluxes in water table elevation, varying weather patterns and event sizes, and most significantly, the presence of two underground sewer lines. Mounding was observed below the RSC during small to medium storm events, which shifted to a sink for areas adjacent to the conveyance during larger events. The most prominent factor influencing trends in groundwater interactions appeared to be the presence of the sewer lines. This study shows the importance of understanding how the urban subsurface infrastructure network will influence groundwater interactions in order to avoid unintended consequences or short-circuiting of treatment mechanisms. These findings inform the scientific community of potential challenges when constructing infiltration-based stormwater controls in urban environments where a high density of buried infrastructure may be present.
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