Dikes shall be constructed as follows:
- (1) Topsoil. Before construction, all vegetation and topsoil shall be removed in the area of the dikes.
- (2) Lifts. Dikes shall be constructed of homogenous clay in six to nine inch (6"-9") compacted lifts.
- (3) Slope. Dikes shall be constructed with a slope of no more than one foot (1') vertical rise per three feet (3') horizontal run (1:3) with a minimum top width of four feet (4'). The top of dikes shall be uniformly graded with no depressions or mounds that would hinder maintenance.
- (4) Gravity flow systems. For gravity flow systems, the top of the dike shall be at least six inches (6") below the lowest floor elevation of any building served.
- (5) Surface runoff. The top of the dike shall be at least one foot (1') above the surrounding terrain to divert surface runoff.
Added at 16 Ok Reg 1895, eff 6-11-99
Amended at 25 Ok Reg 2318, eff 7-11-08