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that are not well documented elsewhere: the development of species' micro- habitat preference criteria; the options for using substrate and cover information in the model; and the evaluation of passage flows. Chapter 8 is a brief description of how PHABSIM can be used to evaluate channel modifications to increase habitat potential. Conspicuously absent from this information paper is any detailed dis- cussion about predicting water quality. This should not be interpreted to mean that water quality is not a part of the IFIM. Indeed, water quality analysis is an integral part of the method. It has been omitted from this manual because the subject has been covered in another information paper in this series, Instream Flow Information Paper 17. The use of water quality information in the methodology is explained in Chapter 5. We would suggest that Part I be read at least once in its entirety. This will give the reader an appreciation of how the entire methodology fits together. Individual chapters in Parts I and II should be reviewed, as needed, during an actual application. A word regarding units of measurement is appropriate. The IFIM involves the disciplines of hydrology, engineering, sedimentation, water chemistry, biology, and ecology. We have used the units of measurement traditionally utilized by each discipline. Most hydrologic and engineering data and equa- tions are in English units. Water chemistry and biology use metric units. When these disciplines interface, the potential exists for mixing units. We have attempted to minimize such mixtures, but the reader should not be too surprized to see standing crop expressed in grams per square foot. We apologize for any inconveniences this may cause the reader, but due to the diversity of subject material, we could not see a satisfactory alternative. Questions or comments regarding this manual would be welcomed by the Instream Flow Group. They should be addressed to: Ken Bovee or Dr. Clair Stalnaker Instream Flow and Aquatic Systems Group Western Energy and Land Use Team U.S. Fish and Wildlife Service 2625 Redwing Road Fort Collins, Colorado 80526 (303) 226-9331 iv