A pair of 70-year-old reservoir dams that protect downtown Houston from flooding began overflowing Tuesday, adding to the rising floodwaters from Harvey that have crippled the city after five consecutive days of rain.
Engineers began releasing water from the Addicks and Barker reservoirs Monday to ease the strain on the dams. But the releases were not enough to relieve the pressure after one of the heaviest downpours in U.S. history, Army Corps of Engineers officials said. Both reservoirs are at record highs.

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