This software contains a method of objectively identifying floodplains and terraces from digital elevation models based on local gradient and elevation compared to the nearest channel. The method is described in detail by Clubb et al., 2017. The terrace and floodplain code is based on the Edinburgh Land Surface Topographic Tools package. Detailed documentation and tutorials for installation and running the code can be found at http://lsdtopotools.github.io/LSDTT_book/ Use of this software for research should cite: Clubb, F. J., Mudd, S. M., Milodowski, D. T., Valters, D. A., Slater, L. J., Hurst, M. D., and Limaye, A. B. (2017) Geomorphometric delineation of floodplains and terraces from objectively defined topographic thresholds, Earth Surf. Dynam., 5, 369-385, https://doi.org/10.5194/esurf-5-369-2017