Field Scouring Experiment on the residues of shenfu dongdheng coalfield during exploitation was con- ducted with the method of simulate overland flow. Results showed that the shorter deposits time of the residues characterized the larger erodibility due to the gradually stable compaction after 4 to 7 years natural deposit process. Sediment load decreased with the order of residues of 1997

residues of 1994

coal and gangue under the same overland flow. Moreover

linear relation lies in runoff

sediment and overland flow. Sediment concentration in mining-site residues kept a high level and turned irregularly with time

which revealed high erosion potential in these sites. It decreased and approached to a constant in the last. In addition

debris flow goes with the runoff and sediment processes.