Hydrology is a long continuing hydroscience and much work done in this field in the past, particularly in India, was of empirical nature related to development of empirical formulae, tables and curves for yield and flood of river basins applicable to the particular region in which they were evolved by investigators like Binnie, Barlow, Beale and Whiting, Strange, Ryves, Dicken, Inglis, Laceā¦