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HARRISON, PHILIP  Earth Sciences, University of Northern Colorado.

This work compares three computer instream flow models. The models are the Physical HABitat SIMulation System, SALMOD and CompMech model. The National Environmental Policy Act of 1969 and its requirement for instream flow water allocations spurred the development of two Federal instream flow models: the Physical HABitat SIMulation System and SALMOD.

The Physical HABitat SIMulation System models the physical properties of stream habitat (hydrology) and then conceptually represents the fish habitat requirements by weighted useable area or habitats theoretically suitable for fish. The SALMOD model is an extension of the Physical HABitat SIMulation System model. SALMOD simulates the addition of various fish cohorts throughout their life cycle. These two models represent the state of the art for instream flow models used by the Federal government.

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