APPROXIMATE PRESSURES ON SHEETED TRENCH FACES OR WALLS

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| | | | || | | |
Pressure |III_{1}|III_{3}|III_{3}|III_{3}||III_{2}|III_{4}|III_{4}|III_{4}
per square|Earth. |Earth. |Water. | Total ||Earth. |Earth. |Water. | Total
foot at | | | | earth || | | | earth
| | | | and || | | | and
| | | | water.|| | | | water.
__________|_______|_______|_______|_______||_______|_______|_______|_______
| | | | || | | |
A | 575 | 510 | 100 | 610 || 1,350 | 810 | 140 | 950
B | 400 | 350 | 190 | 540 || 900 | 540 | 260 | 800
C | 200 | 175 | 280 | 455 || 450 | 270 | 380 | 650
__________|_______|_______|_______|_______||_______|_______|_______|_______
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| | | | || | | |
Pressure |IV_{1}|IV_{3}|IV_{3}|IV_{3}||IV_{2}|IV_{4}|IV_{4}|IV_{4}
per square|Earth.|Earth.|Water.|Total ||Earth.|Earth.|Water.|Total
foot at | | | |earth || | | |earth
| | | | and || | | | and
| | | |water.|| | | |water.
__________|______|______|______|______||______|______|______|______
| | | | || | | |
A | 1,370| 1,210| 100 | 1,310|| 3,175| 1,910| 150| 2,060
B | 1,170| 1,030| 200 | 1,230|| 2,700| 1,610| 290| 1,900
C | 970| 855| 290 | 1,145|| 2,250| 1,355| 430| 1,785
D | 775| 680| 370 | 1,050|| 1,800| 1,100| 570| 1,670
E | 590| 515| 460 | 975|| 1,350| 820| 710| 1,530
F | 400| 350| 560 | 910|| 900| 540| 860| 1,400