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二、一级流域(区域)河流基本情况
2-2-1 河流数量
![](https://epubservercos.yuewen.com/05FD3F/21277076401898006/epubprivate/OEBPS/Images/19435_41_1.jpg?sign=1734432533-5qTjtiCmeeXxcF8IcR3C2o0SlF3RjCir-0-bb26a36f4dfc1321920957d862509a15)
2-2-2 河流总长度
![](https://epubservercos.yuewen.com/05FD3F/21277076401898006/epubprivate/OEBPS/Images/19435_42_1.jpg?sign=1734432533-rJVwULvRZxnznqAXgpQy7GghTu5rY4W4-0-bb265a82c5d39f86a2d420bfb8c1fefe)
2-2-3 河流密度
![](https://epubservercos.yuewen.com/05FD3F/21277076401898006/epubprivate/OEBPS/Images/19435_43_1.jpg?sign=1734432533-aukaiAHgYGmcYUJhjPv6MbfytAcUCKR9-0-fae1d66ce622de1eb6dcf815215c6c6f)
2-2-4 按长度分的流域面积50km2及以上河流数量及比重
![](https://epubservercos.yuewen.com/05FD3F/21277076401898006/epubprivate/OEBPS/Images/19435_44_1.jpg?sign=1734432533-e3S9NKidUieEtT0cxJGSQjbMRODT7mzQ-0-3b2fd85a11b8f1fca39fd6e40ed4b7a2)
2-2-5 按比降分的流域面积100km2及以上河流数量及比重
![](https://epubservercos.yuewen.com/05FD3F/21277076401898006/epubprivate/OEBPS/Images/19435_45_1.jpg?sign=1734432533-81c2xqkoY37YKQROVMlkPYVKmbCAx5cV-0-f6770192660b45027c78a983d89d8a6a)
注 表中流域面积100km2及以上的河流数据为山地河流的统计数据。
2-2-6 河流水文站和水位站
![](https://epubservercos.yuewen.com/05FD3F/21277076401898006/epubprivate/OEBPS/Images/19435_46_1.jpg?sign=1734432533-SnMC4akMbxE9KGAjt58UQthHYZznJyr8-0-2f4c8d6f0f1188e8827d5bcade4f5e4c)
2-2-7 调查和实测历史洪水
![](https://epubservercos.yuewen.com/05FD3F/21277076401898006/epubprivate/OEBPS/Images/19435_47_1.jpg?sign=1734432533-x3BhSDu1IGj17juLDxSJYiC1dK4cxh4w-0-83a6e6680820f1cc76ff1738d85ac810)
2-2-8 按多年平均年降水深分的流域面积100km2及以上河流比重
![](https://epubservercos.yuewen.com/05FD3F/21277076401898006/epubprivate/OEBPS/Images/19435_48_1.jpg?sign=1734432533-aOqGIQjYFs2x6SFs7LAKzoyTtyoYyb3j-0-b3c1348ed896e4e002198c10713feaa9)
2-2-9 按多年平均年径流深分的流域面积100km2及以上河流比重
![](https://epubservercos.yuewen.com/05FD3F/21277076401898006/epubprivate/OEBPS/Images/19435_49_1.jpg?sign=1734432533-1yQ2NWocQDTQUivfWLwRcIafJenSyYW4-0-b553d65bbed4637fc6fd983d7889fc84)