Loading and Factor of Safety

The minimum factors of safety for embankment dams would be:

Upstream Slope

Immediately after completion with full construction pore pressure 1.3-1.5

Following rapid drawndown (slip circles between high and low water levels) 1.2-1.3

Downstream Slope

Earthquake and Reservoir Full	1.2
Reservoir full - steady seepage	1.5

In an area subject to earthquakes the following factors are indicative of acceptable values:

Seismic coefficient	0.1	FoS	1.8
Seismic coefficient	0.3	FoS	1.15

Immediately after completion with full construction pore pressure	1.3-1.5
Following rapid drawndown (slip circles between high and low water levels)	1.2-1.3