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1 城区地理位置及排洪现状光山县城地处河南省南部,大别山的北麓,属于华北平原向大别山的过渡带。历史上城区范围仅限于护城河之内,人口不超过万人;50年代到70年代末,城区范围基本上不超过3.5km~2,总人数不到4万人;到1997年底城区面积发展到10km~2,城区总人数已超过8.3万人。城区范围及人口较解放初期成倍扩大与增长,但城区的防洪排涝能力没什么变化。城区西北部的洪水大部分仍是通过何油坊、三里桥、七
1 Urban Geographic Location and Status of Flood Discharge Guangshan County is located in the southern part of Henan Province and the northern foot of the Dabie Mountains. It belongs to the transitional zone between the North China Plain and the Dabie Mountains. The history of the urban area is limited to the moat, the population does not exceed 10,000 people; from the 1950s to the late 1970s, the urban area basically does not exceed 3.5km ~ 2, the total number of less than 40,000 people; by the end of 1997 the urban area to 10km ~ 2, the total number of urban areas has more than 83,000 people. The urban area and its population doubled and increased as compared with the early days of liberation, but there was no change in the flood control and drainage capacity of urban areas. Most of the flood in the northwest of the city is still through the oil mill, Sanliqiao, VII