DEVELOPMENT OF A METHODOLOGY FOR INCORPORATING FESWMS-2DH RESULTS

This study presents the analysis of a complex flow system that contains two roadways with multiple openings: US Highway 75 and the Southeast Kansas Corridor. Typical analyses of floodplains at such sites involve the use of the one-dimensional backwater models HEC-2, HEC-RAS or WSPRO. Fairly broad assumptions are made concerning the division of flow for multiple opening bridges in applying these one-dimensional models. The analysis presented herein involves the application of the two-dimensional finite element model FESWMS-2DH (Finite Element Surface-Water Modeling System: Two-Dimensional Flow in a Horizontal Plane) to the site near Neodesha, Kansas. This model was used to determine analytically (numerically) the division of flow among conveyance structures at each of the roadways. The results of the study with regard to division of flow among the structures is compared to the one-dimensional results obtained by the USGS using the WSPRO model. The methodology used in formulating and applying the FESWMS-2DH model is also presented.