Basin B has thick permeable soils, thus much of the infiltrated precipitation will percolate to the water table, there is likely less throughflow and overland flow. The hydrograph of Basin B shows a gradual increase and decrease in discharge, this reflects the slower pathways that water moves in that system. The suspended sediment concentrations increase and reach their peak before the discharge peak largely due to the routes that sediments take to the channel. As the stream discharge increases, the flow velocity increases. For example, after overland flow has stopped that source of sediment is cut off from the channel.
Streams can do a great deal of work.