Spillway and Stilling Basin, Lower Monumental Dam, Snake River, Washington PDF Download

Author: Richard L. Johnson
Publisher:
ISBN:
Category : Hydraulic models
Languages : en
Pages : 98

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 71

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A 3-bay-wide section of upstream approach, spillway and stilling basin, and exit channel were reproduced in a 1:42.47-scale hydraulic model. Flow conditions adjacent to the spillway were also observed in a 1:100-scale general model. The model tests indicated that capacity of the spillway would be slightly less than computed because of losses at the abutments. Pressures on the crest and piers were above the range of cavitation for all discharges and methods of spillway operation. The original stilling basin would not contain the hydraulic jump at the spillway design flow of 850,000 cfs. Additional excavation in the exit channel, or erosion of the river bed to elev 392, provided the desired capacity for the stilling basin. Minimum excavation requirements and optimum heights of vertical and sloping end sills were determined. (Modified author abstract).

Author: Richard L. Johnson
Publisher:
ISBN:
Category : Hydraulic models
Languages : en
Pages : 132

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Author: Alvin J. Chanda
Publisher:
ISBN:
Category : Hydraulic models
Languages : en
Pages : 182

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Author: Bonneville Hydraulic Laboratory
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Category :
Languages : en
Pages :

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Author: ARMY ENGINEER DIV NORTH PACIFIC BONNEVILLE OREG DIV OF HYDRAULIC LAB.
Publisher:
ISBN:
Category :
Languages : en
Pages : 79

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A three-bay-wide section of the approach channel, spillway and stilling basin, and exit area was reproduced in a 1:40-scale model. Pressures along the center line of a typical spillway bay were satisfactory, but cavitation damage adjacent to stop-log slots in the crest piers was indicated. The spillway design discharge of 850 000 cfs was passed over the crest under a head of 55.5 ft; the computed head was 55.4 ft. Spillway capacity at normal pool elev 440.0 was 684 000 cfs. Use of a sharper exponential curve on the crest pier noses improved but did not eliminate low pressures in the stop-log slots and on adjacent crest areas during the project design discharge. The two pier shapes tested had no significant effect on spillway capacity.

Author:
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Category :
Languages : en
Pages : 0

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The spillway for Little Goose Dam, designed to pass discharges up to 850,000 cfs (2125 cfs per ft of crest), was studied in a 1:42.47-scale, 3-bay, sectional model and a 1:100-scale general model to investigate the performance of various elements of the structure and to determine flow conditions in the tailrace. Maximum velocities that fluctuated between 5 and 12 fps along the north embankment upstream from the spillway were indicated by the spillway model. Tests indicated that the stilling basin of original design was not satisfactory. An acceptable stilling basin was developed in the model, but unusual artesian flow at the site would have required a costly drainage system to protect the basin slab against uplift. Sixteen roller bucket plans were investigated in efforts to eliminate the basin slab and drainage system. A modified Angostura-type bucket, with simpler teeth and shorter apron, was adopted.

Author: Richard L. Johnson
Publisher:
ISBN:
Category : Fishways
Languages : en
Pages : 160

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Book Description
The spillway for Little Goose Dam, designed to pass discharges up to 850,000 cfs (2125 cfs per ft of crest), was studied in a 1:42.47-scale, 3-bay, sectional model and a 1:100-scale general model to investigate the performance of various elements of the structure and to determine flow conditions in the tailrace. Maximum velocities that fluctuated between 5 and 12 fps along the north embankment upstream from the spillway were indicated by the spillway model. Tests indicated that the stilling basin of original design was not satisfactory. An acceptable stilling basin was developed in the model, but unusual artesian flow at the site would have required a costly drainage system to protect the basin slab against uplift. Sixteen roller bucket plans were investigated in efforts to eliminate the basin slab and drainage system. A modified Angostura-type bucket, with simpler teeth and shorter apron, was adopted.

Author: United States. Bonneville Power Administration
Publisher:
ISBN:
Category : Chief Joseph Dam (Wash.)
Languages : en
Pages : 354

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