Laserfiche WebLink
RECOMMENDATIONS <br />• Entrainment (and probable mortality) of native species into the irrigation canals and the <br />power plant is an issue that needs to be addressed. Screens small enough to exclude <br />larval fish would help reduce mortality rates of native fish species, but the amount of <br />debris and sediment in the Green River will probably make the use of such screens <br />impractical. If larval screens are determined to be impractical, larger screens or vertical <br />louvers should be installed to protect larger fish. Other options to reduce. larval fish <br />mortality are available (e.g. use of rotating drums to return larval fish to the river or <br />reducing the amount of water that enters the canal system during larval drift periods), and <br />should be evaluated for effectiveness and cost efficiency. <br />• Efforts should be made to determine if subadult and adult native fish species can pass <br />Tusher Wash Diversion Dam during low-flow periods. Data should be collected when <br />flows are approximately 2,500 cfs in order to determine whether or not a fish ladder is <br />needed to facilitate fish passage during average low-flow conditions. <br />• Future drift netting efforts should include the use of electronic flow meters. The high <br />failure rate of the mechanical flow meters used during this study was probably related to <br />the silt and debris load carried in the water. These factors should not affect the <br />performance of electronic flow meters, and this difference would improve the accuracy of <br />the data collected. <br />11 <br />