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<br />586 <br /> <br />Using data on substrate size distribution, the boundary shear stress required to entrain the size cobble <br />encountered will be detennined and plotted against the available shear stress to detennine flowrate <br />at which cobble and gravel sizes found in suspected spawning locations are entrained at these <br />locations. <br /> <br />5. Analyze Mechanism of Backwater Habitat Formation and Maintenance. In 1995 and 1996, <br />backwaters that have persisted for more than 1 year and more than 2 years were identified and <br />habitat quality parameters were measured. A representative sample of these persistent backwaters <br />will be surveyed for a second year, along with the channel control necessary for their formation and <br />maintenance and the hydraulics of the reaches characterized. Those conditions unique to these <br />backwaters will be identified and the hydraulic conditions necessary to create and maintain them <br />determined. The feasibility of augmenting backwater habitat by construction of similar features will <br />be examined. <br /> <br />Budget (Funded by BIA): <br /> <br />Category <br />Labor <br />Travel, per diem <br />Vehicie/Equipment Use <br />Supplies <br />Overhead <br />TOTAL: <br /> <br />Cost <br />$110,020.00 <br />$17,020.00 <br />$2,650.00 <br />$6,000.00 <br />$700.00 <br />$136,390.00 <br /> <br />HABITAT MAPPING AND RESOURCE UTILIZATION <br /> <br />Background: <br /> <br />The documentation of habitat types within the San Juan River from RM 180 to RM 0 will be continued <br />during FY97, although at a reduced scale. Sufficient data have been collected to develop habitat/flow <br />relationships, with verification of stability with time and flow change. More emphasis will be placed on <br />habitat quality assessment and its spacial and tempera! variability. <br /> <br />Habitat utilization information collected during the squawfish radio tracking studies in 1994 and 1995 will <br />be correlated with the habitat distribution data. In a similar manner, y-o-y captures will also be correlated <br />with habitat data where possible. <br /> <br />Objectives: <br /> <br />1. Main River Habitat Mapping:. Map San Juan River habitat from RM 180 to RM 0 at sub-sample <br />locations in January and the full range during September-October. This objective is a continuation <br />of the 1996 work at a reduced scale. <br /> <br />2. Digitize and process data utilizing GIS. Habitat mapping data will be digitized and entered into the <br />ArcCAD system. <br /> <br />46 <br />