Rotating Drum Screen
Design Flows
WDFW Yakima Screen Shop
Rotating Drum Screen Design Flows1 in CFS
|
Nominal Drum Length (feet) |
| Screen Diameter (feet) |
4.02 |
6.03 |
8.04 |
10.05 |
12.06 |
14.07
|
| 1.5 |
1.6 (1.7) |
2.5 (2.7) |
NA |
NA |
NA |
NA |
| 2.0 |
2.2 (2.3) |
3.4 (3.6) |
4.6 (4.8) |
NA |
NA |
NA |
| 2.5 |
2.7 (2.9) |
4.2 (4.5) |
5.7 (6.1) |
7.2 (7.6) |
NA |
NA |
| 3.0 |
NA |
5.0 (5.3) |
6.7 (7.1) |
8.5 (9.0) |
10.2 (10.9) |
NA |
| 3.5 |
NA |
5.8 (6.2) |
7.8 (8.3) |
9.9 (10.5) |
12.0 (12.7) |
NA |
| 4.0 |
NA |
NA |
9.0 (9.5) |
11.3 (12.0) |
13.7 (14.5) |
16.0 (17.0) |
| 4.5 |
NA |
NA |
NA |
12.7 (13.5) |
15.4 (16.3) |
18.0 (19.1) |
| 5.0 |
NA |
NA |
NA |
14.1 (15.0) |
17.1 (18.1) |
20.0 (21.2) |
| 5.5 |
NA |
NA |
NA |
NA |
18.8 (20.0) |
22.0 (23.4) |
| 6.0 |
NA |
NA |
NA |
NA |
20.5 (21.8) |
24.0 (25.5) |
| 6.5 |
NA |
NA |
NA |
NA |
NA |
26.0 (27.6) |
| 7.0 |
NA |
NA |
NA |
NA |
NA |
28.0 (29.7) |
- Maximum Flow @ 0.4 fps approach velocity w/ 80% optimum drum submergence; (flow @ 85% max. submergence)
- effective length = 3.37 feet
- effective length = 5.25 feet (5.17 feet 3' dia.)
- effective length = 7.12 feet (7.00 feet 3' dia.)
- effective length = 9.00 feet (8.83 feet 3' dia.)
- effective length = 10.67 feet
- effective length = 12.50 feet
Effective Length deductions: 3" for each side seal; 1.5" bands @ 2' centers for drum dia. 2.5' (2" bands for dia. 3.0')
J.A. Easterbrooks/Revised May 10, 1999
Fish Passage Technical Assistance Index
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© 1999 Washington Department of Fish and Wildlife
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