The Influence of the Instantaneous Collapse of Tailings Pond on Downstream Facilities

Table 1

Roughness coefficient n of the natural river bed [36].

Pattern of riverbed	Minimum value	Normal value	Maximum value
Flooded path with many weeds and deep pools or trees and undergrowth that severely retard water	0.075	0.100	0.150
No plants on the riverbed, the mountains on both side are steep,and trees and shrubs on the river banks are flooded at high water levels	0.030	0.040	0.050