2000-07-31_GENERAL DOCUMENTS - M1978305

• Permit No: M1978305
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Date: 7/31/2000
• Doc Name: Highwall stability
• From: Allen Sorenson
• To: Bob Oswald
• Email Name: RCO
• Media Type: D
• Archive: No

Catch bench nomenclature and recommended dimensions.2
Gt, Lt
e�►C�'
OEHCH
HEIGHT
MINIMUM EENCH WIDTH
BERM IMPACT ZONE •
DERM
HEIGHT •�•
Design Catch Bench Geometry
Bench Impact Berm Berm
Height Zone Height Width
m (ft) m (ft) m (ft) m (ft)
12 (40) 3 (10) 1 (3) 3 00)
15 (50) 3 .5 (11.5) 1.5 (5) 4 (13)
18.5 (60) 3.7 (12) 1.6 (5) 4 .2 (14)
24 (80) 4 (13) 2 (6.5) 5 (16.5)
30 (100) 4 . 5 (15) 2 (6.5) 5.5 (18)
45 (150) 5 (16) 3 (10) 8 (26)
(adapted from Call, 1986)
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