A Critique of the Instream Flow Incremental Methodology and Observations on Flow Determination in New Zealand

One of the most popular models for simulating the effect of regulated streamflow on fish habitat is the Instream Flow Incremental Methodology (IFIM). This model was developed by the Instream Flow Group (IFG) and is composed of components which simulate water temperature, water quality, and physical habitat. The physical habitat component (PHABSIM), however, is so frequently the only part of the method used that PHABSIM and IFIM are often confused.

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