This slide illustrates the interaction of transport capacity, sediment load, sediment production, and deposition on a complex slope.
Main points:
If transport capacity exceeds sediment load, sediment load will be determined by the amount of sediment made available by detachment.
If sediment load exceeds the amount of sediment produced by detachment, deposition occurs.
If the sediment load exceeds transport capacity because of a decrease in transport capacity, deposition occurs which reduces sediment load.
When deposition occurs, sediment loads “lags” transport capacity depending on the fineness of the sediment.
Deposition is a selective process where the coarse particles are deposited leaving the sediment load enriched in fines.
In this illustration, local deposition occurs on the very flat portion of the hillslope because interrill erosion produces more sediment than the flow can transport.
Deposition occurs on the lower end of the slope because of a decrease in transport capacity because of a flattening of the slope.  Deposition begins to occur where transport capacity equals sediment load.  Deposition does not necessarily begin to occur just where transport capacity begins to decease.