1. the main factors and reasons) apply to drainage systems: flooding can be classified based on severity levels in three levels: (1) level of catastrophic floods occurred in areas with high slope is the main factor, and caused by the torrent and contact each other for long periods of time. Resulted in great floods from the high areas down to low level areas (2) floods are major factors in moderate and heavy rains and caused each other for long periods of time. In addition, there are factors that support is the convergence of the river tributaries of several points. With no sources, water catchment and river conditions have a low Bank. Resulted in floods ebb overflow Bank (3) some light flood levels occurred in the plains area and main factors caused by the torrent and contact each other for long periods of time. In addition, there are factors that support is there are no drainage system network performance because River basin out of bounds. Mae Mae rivers meet Marietta noton. Moreover, the lower River is a river on a winding narrow tightly noton and shallow with complementary factors of land utilization with wireless expansion direction until the invasion occurred and the waterfront area, the construction of a dam and Weir pools to slow down without door open-close. Resulted in floods ebb overflow Bank and global flooding
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