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After the flood of 1607, the tunnel of Huehuetoca was undertaken, and constructed in eleven months, for the purpose of letting out of the valley the waters of the River Guautitlan, so as to prevent it from falling into Tezcuco or flooding the city.
The waters of the valley are now distributed in the best possible manner to favor evaporation; and yet so completely is this power taxed, that when, in 1629, a water-spout, bursting over the small river Guautitlan, had forced the waters of Zumpango over its barriers into the San Cristobal, and that again into the Tezcuco, the city was inundated to the depth of about three feet.
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