Abstract: A liquid containment device and method for containing leakage from a liquid reservoir. The liquid containment device comprises a base and a peripheral wall that comprises flexible resilient folds that allow a portion of the peripheral wall to be flattened against the floor to slide the liquid containment device under the liquid reservoir. The peripheral wall is resilient and returns readily to a position where it extends upwardly from the base when released. The liquid containment device can be installed by lifting slightly a reservoir, flattening a portion of the peripheral wall, sliding it under the reservoir until the flattened portion protrudes past the far edge of the reservoir whereupon it resiliently regains its shape forming a receptacle under the reservoir. Abstract not to be interpreted as limiting.