In 2020 New South Wales published 9 long-term water plans (LTWPs) for the NSW portion of the Murray–Darling Basin.
An environmental water requirement (EWR) for the purpose of NSW LTWPs, describes a set of recommended flow characteristics at a certain location (river gauge) to meet a particular set of environmental objectives in a particular river reach and its associated floodplain.
The EWR assessment code (EWR_Tool) is a computer code in Python that assesses the occurrence of flow conditions that meet or partially meet the LTWP EWRs in observed or modelled flow time series. A link to this code can be found here:
This document provides an outline of the technical details of the EWR_tool (assessment code) and how the EWRs are evaluated.
