Fig. 6
Schematic diagrams showing pathways for surface water infiltration. (a) and (b) Schematic diagrams showing pathways for surface water infiltration in the Niuyao and Banpo valleys, indicating that the surface water tends to infiltrate to the goaves along the paleo-valleys with thin overburden and high permeability but AMD converges in the goaves of the No. 10 coal seam and then overflows in the Modi Valley. (c) Cross section showing pathways for surface water infiltration in the Niuyao Valley, indicating that the surface water infiltrates into the paleo-valley and the goaves of the No. 2 coal seam, then forms perched water with the groundwater from the upper reaches, and finally slowly infiltrates into the goaves of the No. 10 coal seam.
