_______________________________________________________

__________________
|      |      |      |         ||      |      |      |
Pressure  | I_{1}| I_{3}| I_{3}| I_{3}   || I_{2}| I_{4}| I_{4}| I_{4}
per square|Earth.|Earth.|Water.|Combined.||Earth.|Earth.|Wat

er.|Combined.
foot, at  |      |      |      |         ||      |      |      |
__________|______|______|______|_________||______|______|___

___|_________
|      |      |      |         ||      |      |      |
A        | 3,240| 3,690| 1,500|   5,190 || 2,325| 2,880| 2,250| 5,130
B        | 2,745| 3,105| 1,500|   4,605 || 1,845| 2,385| 2,250| 4,635
C        | 2,160| 2,475| 1,500|   3,975 || 1,350| 1,800| 2,250| 4,050
D        |   450|   540| 1,500|   2,040 ||   450|   450| 2,250| 2,700
E        |   360|   360| 1,625|   1,985 ||   450|   450| 2,438| 2,888
F        |   270|   270| 1,750|   2,025 ||   450|   360| 2,626| 2,986
G        |   225|   225| 1,875|   2,100 ||   360|   270| 2,814| 3,084
__________|______|______|______|_________||______|______|___

___|_________
____________________________________________________________

_____________
|      |      |      |         ||      |      |      |
Pressure  |II_{1}|II_{3}|II_{3}|II_{3}   ||II_{2}|II_{4}|II_{4}|II_{4}
per square|Earth.|Earth.|Water.|Combined.||Earth.|Earth.|Wat

er.|Combined.
foot at   |      |      |      |         ||      |      |      |
__________|______|______|______|_________||______|______|___

___|_________
|      |      |      |         ||      |      |      |
A        | 1,485| 1,755| 1,500|   3,255 || 1,035| 1,305| 2,250| 3,555
B        | 1,305| 1,485| 1,500|   2,985 ||   945| 1,170| 2,250| 3,420
C        | 1,125| 1,215| 1,500|   2,715 ||   810|   990| 2,250| 3,240
D        |   405|   405| 1,500|   1,905 ||   540|   450| 2,250| 2,700
E        |   405|   405| 1,625|   2,030 ||   540|   450| 2,438| 2,888
F        |   360|   360| 1,750|   2,110 ||   540|   450| 2,626| 3,076
G        |   315|   315| 1,875|   2,190 ||   360|   360| 2,814| 3,174
H        |   180|   225| 2,000|   2,225 ||   180|   180| 3,000| 3,180
I        |    90|   110| 2,175|   2,285 ||   135|   135| 3,188| 3,323
__________|______|______|______|_________||______|______|___

___|_________

APPROXIMATE PRESSURES ON SHEETED TRENCH FACES OR WALLS

_______________________________________________________

____________________
|       |       |       |       ||       |       |       |
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