Open Access Research Paper Views (969) Estimating the probable maximum flood (PMF) using HEC-HMS Model: A case study in Northwest Iran-Ajichay’s Basin Ali. Hanafi, Faramarz Khoshakhlagh J. Biodiv. & Environ. Sci. 6(1), 227-235, January 2015. Keywords: Ajichay Basin, HEC-HMS Mathematical Model, Hydrograph, Probable Maximum Flood Details