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APPENDIX F Design criteria:
The stability factors and loadings used in the design of the spillway and outlet works were as follows:
Allowable sliding factor = . 30 Spillway gate structure (maximum)
= .35 Spillway inlet walls
= .40 Spillway chute walls and
= . 45 Spillway stilling basin walls
= . 50 Abutment walls (no downstream
Weight of dry earth fill 120 Ib. per cu. ft.
130 (for conduits, spillway inlet walls)
Weight of saturated
Horizontal dry earth- 40 Ib. per cu. ft.
Weight of water 62.5 Ib. per cu. ft. .
Weight of concrete 150 Ib. per cu. ft.
_!_/ By equivalent fluid pressure theory
Design of all concrete structures was based on concrete of 3,000 pounds per square inch compressive strength at 28 days and a modular ratio of 10. Allowable working stresses in pounds per square inch for all concrete structures except pressure and horseshoe conduits, for which other steel tension and concrete compressive stresses were used under certain loading conditions, are indicated below:
fs = 20,000, in flexual members
v = 90
Allowable steel tension and concrete compressive stresses in pounds per square inch for conduits are as follows:
APPENDIX F (Continued) Normal loading f
External loads 1,350
Internal load combined with
Extraordinary loading (investigated only)
Internal load combined with vertical
Vertical loads and no lateral
18,000 - 40h
21 Pressure conduit only