Physical habitat simulation system reference manual - Version II, Instream flow information paper no. 26

The purpose of this manual is to provide information on the programs that comprise the U.S. Fish and Wildlife Service's Physical Habitat Simulation System (PHABSIM)--Version II. In Version I of PHABSIM there were essentially two steps. The first was to do hydraulic simulation and the second was to do habitat simulation. In Version II there are four steps. The first is to simulate water surface elevations, the second to simulate velocities, the tired is to simulate the physical habitat versus streamflow relationship, and the fourth is to simulate the physical habitat when combinations of flows are involved.