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Global Assessment of Hydrologic Alteration (Grill et al. 2019)
Global-scale assessment mapping the degree of flow regulation and hydrological alteration across 12 million river kilometres worldwide. Published in Nature, this study found... -
Pairwise IHA Analysis: Python Toolkit for Assessing Reservoir Impacts
Python-based tool for pairwise upstream-downstream IHA analysis at reservoirs and dams. Enables comparison of flow regime characteristics above and below impoundments to... -
IHA R Package: Indicators of Hydrologic Alteration Implementation
Open-source R package implementing the full Indicators of Hydrological Alteration (IHA) methodology for reproducible, scriptable analysis. Provides functions for calculating all... -
Ecological Reserve Determination and Compliance Monitoring: Crocodile River Catchment
Reserve determination and compliance assessment for the Crocodile (West) River using IHA-based flow analysis. Documents recommended ecological flows based on the Building Block... -
Understanding Hydrological Processes at Ungauged Points in the Incomati...
Application of the IHA methodology to 33 gauging stations across the Incomati (Inkomati) River Basin in South Africa. Analyses streamflow variability and identifies... -
The Ecological Limits of Hydrologic Alteration (ELOHA): A New Framework...
Framework for developing regional environmental flow standards that scales the IHA approach from individual sites to entire regions. ELOHA consists of four steps: (1)... -
The Natural Flow Regime: A Paradigm for River Conservation and Restoration...
Landmark paper establishing the natural flow regime as the central paradigm for river conservation and restoration. Identifies five critical components of flow regime —... -
How Much Water Does a River Need? The Range of Variability Approach (Richter...
Key companion paper to the 1996 IHA methodology introducing the Range of Variability Approach (RVA) for setting streamflow-based river ecosystem management targets. Defines a... -
A Method for Assessing Hydrological Alteration within Ecosystems (Richter et...
Foundational scientific paper introducing the Indicators of Hydrological Alteration (IHA) methodology. Presents 32 hydrological parameters (later expanded to 33) organised in 5... -
IHA Software Version 7.1: User's Guide
The Nature Conservancy's Indicators of Hydrological Alteration (IHA) software manual, version 7.1. Provides comprehensive guidance on using the free IHA software for calculating...
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