| 1999 Proceedings INCORPORATING RAPID INTERFLOW INTO THE HEC-1 MODEL Ashok K. Verma and Richard A. Cooke University of Illinois at Urbana-Champaign We have coined the term "rapid interflow" to represent that portion of interflow that is intercepted by artificial tile drains and transported directly to outlet channels. In densely tiled watersheds such as occur in many regions of Illinois, this flow component can be a significant modifier of flood peaks and floodwater quality in rivers, ditches, and streams. In this paper we discuss the development of a comprehensive watershed-scale model in which a GIS-based interface is used to link HEC-1 with RAPIDFLOW, a rapid interflow routine based on the deZeeuw and Hellinga’s fluctuating water table equation. This model was tested with data from the Upper Embarras River watershed.
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