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Florida Fish and Wildlife Conservation Commission

PHABSIM is a tool by Florida Fish and Wildlife Conservation Commission for flow evaluation in Florida streams. It combines hydrological and biological models to predict habitat changes over various discharges. Learn about its components, output, limitations, and criticisms.

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Florida Fish and Wildlife Conservation Commission

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  1. A TOOL FOR EVALUATING FLOW REQUIREMENTS IN FLORIDA STREAMS? Florida Fish and Wildlife Conservation Commission Eric Nagid and Gary Warren PHABSIM:

  2. Physical HABitat SIMulation System • Combines hydrological and biological models to predict changes in habitat area over a range of discharges. • Is a component of the Instream Flow Incremental Methodology (IFIM). • Is the most widely used model for deductive estimation of biological effects of stream flow alteration. • Has been successfully defended in court.

  3. Biological • Habitat Preference Criteria – for each life stage. • velocity • depth • substrate / cover Primary Components of PHABSIM • Hydrological • Field measurements of physical habitat conditions • along transects. • velocity • depth • substrate / cover 2. Hydrological modeling of flow / stage relationships.

  4. PHABSIM Flowchart

  5. PHABSIM Output Weighted Usable Area • The usable area of habitat available, in a stream reach, to a given species at a given discharge. • The product of velocity, depth, and substrate/cover preferences multiplied by cell size. • WUAs are summed over an entire reach and used as an index of habitat quality and availability.

  6. Limited range – SSC Recreationally important Easily sampled Flow sensitive Sessile Easily sampled Biological Suspectsfor the Suwannee River Basin Suwannee bass (Micropterus notius) Net-spinning caddisflies (Hydropsychidae), Mayflies (Baetidae)

  7. Little evidence that fish populations actually respond to changes in weighted usable area. • Does not perform well in soft-bottomed, shifting sediment streams. • PHABSIM is unidimensional. Locally: • Fish in peninsular Florida, particularly Centrarchids, are ubiquitous. Therefore, HSC may be vague and uninformative. Criticisms of PHABSIM General:

  8. Evaluation of Stream Flow Models Selecting and Modifying the Most Appropriate Model for Florida Streams • PHABSIM / IFIM • River 2D • Channel Units / Channel Types (CU / CT) • Indicators of Hydrologic Alteration (IHA) • System Impact Assessment Model(SIAM)

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