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<br />Table 1. Occurrance of different combinations of depth and velocity, <br />expressed in square feet of surface area per 500 feet of stream <br />reach, Discharge = 800 cfs. <br /> <br />Depth VELOCITY IN FEET PER SECOND Row <br />(ft. ) Totals <br /> .5 .5-.99 1. 0-1. 49 1.50-1,99 2.0-2.49 2,5-2.99 3,0-3,49 3.5 <br />1 195 26 221 <br />1.0-1,5 90 47 41 l7 6 6 93 300 <br />1. 5-2, 0 29 38 32 44 108 79 38 172 540 <br />2.0-2,5 6 29 23 9 111 131 143 175 627 <br />2,5-3.0 6 15 55 79 41 64 41 105 406 <br />3,0-3,5 9 17 15 12 32 3 149 237 <br />3.5-4,0 9 20 17 47 17 82 192 <br />4,0-4,5 20 11 50 35 17 133 <br />4,5-5.0 II 5 115 20 151 <br />5,0-5,5 7 23 15 45 <br />5,5-6.0 10 31 20 61 <br />Column <br />Totals 344 233 l25 225 575 390 476 545 2913 <br /> <br />In order to translate changes in stream hydraulics into impacts or <br /> <br />effects on fish habitat it is necessary to identify describable relationships <br /> <br />between appropriate hydraulic parameters and the target species or target <br /> <br />group of species. Assemblege of such an information base was undertaken in <br /> <br />1977 by the IFG staff utilizing existing data from the scientific literature <br /> <br />and files of state fishery management agencies, Four techniques were used to <br /> <br />develop a preliminary information base in the form of two dimensional curves <br /> <br />(originally called probability-of-use curves and as suggested during the <br /> <br />workshop now called habitat suitability curves) describing species preference <br /> <br />for a particular stream flow parameter, (Bovee and Cochnauer 1977). <br /> <br />33 <br />