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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
abutment walls

= . 45 Spillway stilling basin walls

= . 50 Abutment walls (no downstream
earth loads)

Overturning factor
(minimum) 1.50

Weight of dry earth fill 120 Ib. per cu. ft.

130 (for conduits, spillway inlet walls)

Weight of saturated
earth fill 135 Ib. per cu. ft.

Horizontal dry earth- 40 Ib. per cu. ft.
fill load !_/ . 43 (for conduits and spillway

inlet walls)

Horizontal saturated
earth-fill load !_/ 75 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:

fc= 1,350

fs = 20,000, in flexual members
16,000, in web reinforcement

v = 90
u = 200

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
external loads 2/ 1,350

Extraordinary loading (investigated only)

Internal load combined with vertical
loads and no lateral loads 2/ 3,000

Vertical loads and no lateral
loads 3/ 3,000


18,000 - 40h
(h = head in
feet on center-
line of conduit)


21 Pressure conduit only
7/ Horseshoe conduit only

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