County surrounded by mountains, the territory of diverse terrain, for the south-central hilly areas in the eastern and northern mountainous deep valley, the mountains to the west basin.
县境四周环山，境内地形多样，中南部为低山丘陵区，东部、北部山多谷深，西部为山间盆地。
Flash flood is a kind of sudden flood which is caused by the sudden rainfall, rises up and down sharply in the basin hilly and mountainous areas.
山洪是山丘区中流域由降雨引起的突发性、暴涨暴落的洪水。
Soil and water erosion in hilly areas of the middle Sichuan Basin is extraordinary seriously in China. This area has an enormous population, but the field is not enough.
川中丘陵区是我国水土流失最为严重的区域之一，人口众多，耕地稀少，土壤侵蚀严重，因此被列入长江上游水土流失重点防治工程的核心区域。
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