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https://hdl.handle.net/11681/47529| Title: | Little Goose Dam, Snake River, Washington : Hydraulic Model Investigation |
| Authors: | Johnson, Richard L. Perkins, Louis Z. |
| Keywords: | Fishways Hydraulic models Locks (Hydraulic engineering) Snake River (Wyo.-Wash.) Little Goose Dam (Wash.) |
| Publisher: | United States. Army. Corps of Engineers. Walla Walla District. |
| Abstract: | A 1:100-scale hydraulic model was used to study the alignment of structures, excavation requirements, and flow conditions at Little Goose Dam. Tests of first-step construction led to relocation of the temporary fishway, use of rockfill groins along the north shore, selection of limits for disposal fills, and reductions of excavation, number of cofferdam cells, and height of embankments. The tests indicated that flow conditions during the first phase of second-step construction would be acceptable and that excavation planned for the second phase could be reduced. Approach flow into the completed spillway and powerhouse was satisfactory. The excavated tailrace could be raised 20 ft without decreasing head on the powerhouse. Poor entrance conditions into the lower lock approach were eliminated by shortening and reshaping a protective fill along the river side of the approach. Performance of the fish collection system improved when the north fishway entrance was moved upstream and a 90-ft-long rock dike was placed adjacent to the right wall of the spillway roller bucket. Differences between final design (model) and contract (prototype) structures and excavation plans had no significant effect on flow conditions in the tailrace. Should the dentates in the spillway bucket erode, the hydraulic jump will move downstream, desired head between the fishway entrances will be eliminated, and erosion of the riverbed will be increased. |
| Description: | Technical Report |
| Rights: | Approved for Public Release; Distribution is Unlimited |
| URI: | https://hdl.handle.net/11681/47529 |
| Appears in Collections: | Technical Reports |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Technical Report 110-1.pdf | 42.96 MB | Adobe PDF |  View/Open |