WSP06927 - Laserfiche WebLink

Home Browse Search

the introduction of sediment into the Colorado River and changes in the water quality. These changes should be accomplished through a mixture of both operational and structural changes. Warming of the water could be accomplished by installing a multilevel outlet on the dam the sam benefit could possibly be accomplished by holding the water high and steady to warm the water in the backwaters. This alternative requires sediment augmentation. This may require a slurry pipe or other structures. There is probably a need to add nutrients the system but more research is needed into this area. of the nutrient addition may be accomplished as a part the sediment augmentation. or into Some of 6. Structural Alternative. This is the high tech, super alternative and identifies only structural features such as the development of a reregulating dam or smaller attenuating dams. Sediment augmentation would be handled through the development of a sluiceway, pipeline or other method of depositing sediment at the Paria River. Beaches should be artificially stabilized through the use of binwalls, rocks, dredging or vegetation planting. Fish barriers could be installed at the mouth of the Little Colorado River and backwaters could be artificially developed. The creation of wetlands and spawning bars could be artificially manipulated. Boating access above Lee's Ferry could be improved through channelization. Key beaches would have designated landing areas with beach stairs and sand ladders to help control erosion. A warm water hatchery could be developed near the Little Colorado River and a cold water hatchery could be developed near the dam for the trout. 7. Maximize the resources of the Grand Canyon Ecosystem. These priorities include; sediments, native fishes, native fauna, riparian plants, recreation, and trout fishery. The following management issues would be addressed: high minimum flows, less frequent flooding, reduction in short- term (daily) fluctuations, ramping. 8. Yellow Flag Alternative. This alternative could be called the "adaptive management alternative." Under this alternative the various resource priorities are identified or, through the research, "windows" are established to meet the needs of the specific resources. The resource priorities would come from the managing agencies and through the monitoring program. When critical or unacceptable levels of resource degradation are occurring the operation will be modified to minimize the impact to the resource and bring it back to an acceptable level. 18 ~