Late in the winter of 1824, the Hongze Lake was dangerously swollen from floods and seepage in the region. As a rainstorm lashed the lake, wind and the waves tore two huge breaches in the dike along the lake's eastern perimeter, sending flood waters cascading down into the Gao-Bao lakes to the east, into the Grand Canal, and beyond the canal into the flood-prone, low-lying Xiahe region between the canal and the sea. Controlling from Afar examines...