#11 Embankment Specifications - II
Combined upstream and downstream side slopes of embankment shall not be steeper than 5:1 (h:v) with neither slope exceeding 2:1
Provide freeboard, depending on dam classification (usually 1 to 2 feet)
Provide anti-seep collars or seepage diaphragms for all conduit pipes through the embankment greater than six inches in diameter
Notes:
Most of these criteria are designed to ensure safety and prevent dam breach. The �combined upstream and downstream side slopes� refers to the addition of the two h:v ratios. For example, a 4:1 upstream slope and a 3:1 downstream slope would result in a 7:1 combined slope.