Calculating excavation slope.
|Type of Soil||Slope |
(x : y)
|Solid rock, shale or cemented sand and gravels||0 : 1|
|Compact angular gravels||1/2 : 1|
|Recommended slope for average soils||1 : 1|
|Compact sharp sand||1 1/2 : 1|
|Well-rounded loose sand||2 : 1|
Example - An Excavation in Sharp Sand, 10 ft deep
Excavation in sharp sand should be sloped 1 1/2 unit for each unit depth.
(10 feet) (1 1/2 feet/foot) = 15 feet