the unexpected volume of flooding water ... cascading from such a focused source on non-government property at the top of the hill, down the hillside, over the stone retaining wall and across the roadway before freezing.” (ECF No. 42-1, at 22). The Government ignores the crucial issue, however. Regardless of the initial source of the water, the NPS may nonetheless be responsible for water that collects on the Parkway because it allegedly failed to keep the drainage ditch clear of debris. See Jennings v. United States, 291 F.2d 880, 887 (4th Cir.1961) (observing that the United States may be liable for negligently maintaining a drainage ditch, the inadequacy of which may have contributed to an icy patch on the roadway); cf. True v. Mayor of Westemport, 196 Md. 280, 76 A.2d 135 (1950) (<HOLDING>). The potential consequences of an unmaintained
holding that an obstruction by a foreign object in a sewer line constitutes a defect holding a city liable for a dangerous condition caused by a submerged municipal sewer pipe in federal waters recognizing that city may be liable for negligent maintenance of sewer system even though doctrine of res ipsa loquitor was inapplicable holding that a municipal sewer system is liable for the acts of a third party that discharged hazardous waste into the system holding a municipality liable for negligently maintaining a sewer where despite extraordinary rainfall the unclogged sewer may have prevented damage to the plaintiffs property