The authors are solely responsible for the content of this technical presentation. The technical presentation does not necessarily reflect the official position of the American Society of Agricultural and Biological Engineers (ASABE), and its printing and distribution does not constitute an endorsement of views which may be expressed. Technical presentations are not subject to the formal peer review process by ASABE editorial committees; therefore, they are not to be presented as refereed publications. Citation of this work should state that it is from an ASABE meeting paper. EXAMPLE: Author's Last Name, Initials. 2012. Title of Presentation. ASABE Paper No. 12----. St. Joseph, Mich.: ASABE. For information about securing permission to reprint or reproduce a technical presentation, please contact ASABE at rutter@asabe.org or 269-932-7004 (2950 Niles Road, St. Joseph, MI 49085-9659 USA). An ASABE Meeting Presentation Paper Number: 12-1337239 Development a Fluvial Detachment Rate Model to Predict the Erodibility of Cohesive Soils under the Influence of Seepage Abdul-Sahib T. Al-Madhhachi, Ph.D. Research Scholar School of Civil and Environmental Engineering, Oklahoma State University, Stillwater, OK 74078; PH (405) 744-9307, FAX (405) 744-7554; email: abdu@okstate.edu Garey A. Fox, Associate Professor, Orville L. and Helen L. Buchanan Endowed Chair Department of Biosystems and Agricultural Engineering, Oklahoma State University, 120 Ag Hall, Stillwater, OK 74078; PH (405) 744-8423, FAX (405) 744-6059; email: garey.fox@okstate.edu Greg J. Hanson, Research Leader USDA-ARS Hydraulic Laboratory, 1301 N. Western, Stillwater, OK 74075; PH (405) 624- 4135; email: greg.hanson@ars.usda.gov Avdhesh K. Tyagi, Associate Professor School of Civil and Environmental Engineering, Oklahoma State University, Stillwater, OK 74078; PH (405) 744-9307, FAX (405) 744-7554; email: tyagi@okstate.edu Rifat Bulut, Assistant Professor School of Civil and Environmental Engineering, Oklahoma State University, Stillwater, OK 74078; PH (405) 744-7436, FAX (405) 744-7554; email: rifat.bulut@okstate.edu Written for presentation at the 2012 ASABE Annual International Meeting Sponsored by ASABE Hilton Anatole Dallas, Texas July 29 – August 1, 2012 Abstract. Seepage influences the erodibility of streambanks, streambeds, dams, and embankments. Usually the erosion rate of cohesive soils due to fluvial forces is computed using an excess shear stress model, dependent on two major soil parameters: the critical shear stress ( c ) and the erodibility coefficient (k d ). A submerged jet test apparatus (JET – Jet Erosion Test) is one method for measuring these parameters. However, no mechanistic approaches are available for incorporating