DHRAM (The Dundee Hydrological Regime Assessment Method) is a method for assessing the alterations in the hydrology of the watercourses. The model is a simple MS-Excel application. It calculates several statistical factors from the flow data. The model compares statistical differences between the flow data measured or modelled in an impacted and unimpacted state of the river. The method is only statistical, and does not have any measured biological response of the flow alterations.