The flooded areas were mainly along the middle and upper reaches of the Keelung River. One reason is that the rainfall in these areas was particularly heavy, and another is that this portion of the river is narrow and the rolling flood-waters found nowhere to go except over the bank.
分析起來，這次淹水區域主要是基隆河中、上游兩岸，原因之一，這些地區雨下得特別多；加上基隆河河道狹窄，滾滾洪流從上游下衝，水要漫出去，卻發現無路可通﹘﹘下游兩岸築了堤防，於是又往回竄。