11. The dam's crest was raised to prevent overtopping during the projected maximum flood condition. 12. However others have proposed that the lava dams were much more ephemeral and failed catastrophically before overtopping . 13. The muddy waters flowed rapidly downstream causing flooding in the evacuated town of Beichuan and overtopping of dams. 14. The floodway is operated by a controlled destruction of the levee, either with explosives or by overtopping . 15. Rainfall lasted from March 23 till April 78 and as a consequence the R�o Negro suffered an overtopping . 16. Prior to the landslide that caused the overtopping flood, the creep of the regolith had been per week. 17. However, Lake Pontchartrain rose to a higher level than previously recorded, overtopping some of the back levees. 18. The LSU report subsequently found that overtopping did not occur, rather, design failures precipited the levee failures. 19. The dam does not have a spillway capable of withstanding a 100 year flood, and thus often experiences overtopping . 20. Particular attention is given to the matter of surface erosion, overtopping prevention and protection of levee crest and downstream slope.
