c. Effective head, 90 ft.
d. Weight of water, 62.5 lbs. per cu. ft.
e. Weight of material, 125 lbs. per cu. ft.
f. Coefficient of friction, 1.00, or equal to the weight.
g. Factor of safety against sliding, 10.
The width corresponding to the vertical pressure of 1 ft. is,
| 62.5 × 10 | = 5 ft. |
| 125 |
FIG. 19.–GRAPHICAL INTERPRETATION OF STUDIES OF BOARD OF EXPERTS
ON THE ORIGINAL EARTH PORTION OF THE NEW CROTON DAM.