Hi, this is carolyn. ;]
Today's lesson was about the drainage basin. Everything that was on the powerpoint slide is printed on the handout we have so I don't intend to summarize or mention any of it here as reflection. I think constrasting the concepts taught might be more thought provoking actually.

Firstly, we have the difference between infiltration and percolation. Percolation is a subset of infiltration, infiltration represents the overall flow of water into the soil while percolation is specifically, the downward movement of water under the influence of gravity through pores, joints and bedding planes of a permeable rock. Percolation is the flow of water into the zone of saturation while infiltration is the general flow of water into the ground surface layer and because this water flows through both the zone of aeration and saturation, we say that percolation is merely a branch of infiltration.

Secondly, the difference between stream flow and overland flow. Overland flow, as defined by our handout, is water moving above or over the ground. Stream flow comprises of surface and subsurface runoff (interflow and groundwater/base flow) *interflow-infiltration of water by means of gravity toward a stream channel, a long narrow sloping depression on land that is shaped by its flowing water

Lastly, I think that perhaps baseflow and groundwater flow cannot be used interchangeably. Because according to the handout, it states groundwater flow as the soaking of water into the permeable bedrock below water, hence I think it should be a downward motion. However, as we all know, baseflow is the lateral, steady flow of water feeding rivers. Hence, baseflow and groundwater flow are different in concepts. Besides, a book by the american society of civil engineers states baseflow as consisting of slow interflow and groundwater flow.