eflowcalc: a streamflow characteristics calculator in Python

eflowcalc is an open-source calculator of ecological streamflow characteristics in Python. It is licensed under GNU GPL-3.0. The package currently gives the Python scientific community access to 159 ecologically relevant streamflow characteristics inventoried by Olden and Poff (2003). A key strength of eflowcalc is the vectorisation of all calculations (using numpy), and therefore C code in the background) which makes for very efficient computation of the streamflow characteristics.