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On April Fools Day weekend, the Washington Post ran an editorial promoting “a pretty sensible idea”: building a giant garage under the National Mall. The proposal, it turned out, was not made in jest—-and one influential Washingtonian is taking it very seriously.

Del. Eleanor Holmes Norton introduced an amendment to a bill last night in the House Rules Committee that would have authorized a study of the feasibility of this idea, which would help with water management as well as providing parking. (Norton offered it as an amendment to a water resources bill.)

“The appeal of the facility, brought to Norton by constituents, is that the cost would be paid by parking fees and it would aid in flood management, which has become a major issue in the wake of Hurricane Sandy and the 2006 flood that left portions of Federal Triangle and the National Mall underwater,” Norton’s office says in an email.

Alas, Norton’s colleagues didn’t see the appeal; the amendment didn’t pass a vote to move to the House floor.

Renderings from savethemall.org