through the City of New Orleans overflowed their normal boundaries. The flood-control
measures, i.e., levees, that man had put in place to prevent the canals’ floodwaters from
reaching the city failed. The result was an enormous and devastating inundation of water
into the city, damaging the plaintiffs’ property. This event was a “flood” within that
term’s generally prevailing meaning as used in common parlance, and our interpretation
Lastly we turn to the doctrine of efficient proximate cause. Under this doctrine, as it is
applied in many jurisdictions, where a loss is caused by a combination of a covered risk
and an excluded risk, the loss is covered if the covered risk was the efficient proximate
cause of the loss.FN28 See, e.g., Chadwick v. Fire Ins. Exch., 17 Cal.App.4th 1112, 21
Cal.Rptr.2d 871, 873 (1993); Kish v. Ins. Co. of N. Am., 125 Wash.2d 164, 883 P.2d
provided coverage only for loss caused by windstorm) that “if a windstorm is the
dominant and efficient cause of the loss, the insured may recover notwithstanding that
another cause or causes contributed to the damage suffered.” Lorio v. Aetna Ins. Co., 255
La. 721, 232 So.2d 490, 493 (1970); see also Roach-Strayhan-Holland Post No. 20, Am.
Legion Club, Inc. v. Continental Ins. Co. of N.Y., 237 La. 973, 112 So.2d 680, 683
indirectly by” flood “regardless of any other cause or event contributing concurrently or
in any sequence to the loss.” This language, which the district court referred to as an anti–
concurrent-causation clause, has been recognized as demonstrating an insurer’s intent to
contract around the operation of the efficient-proximate-cause rule. See, e.g., TNT Speed
& Sport Ctr., Inc. v. Am. States Ins. Co., 114 F.3d 731, 732-33 (8th Cir.1997).
LEXIS 34710 (S.D.Miss. May 24, 2006) (unpublished opinion) (Hurricane Katrina case
involving alleged damage from wind, rain, and storm surge), appeal docketed, Nos. 06–