Theory 73/River & Floodplain/Floodplain sedimentation
Deposition Is Supply Against Duration
The claim
Floodplain sediment deposition is set by the ratio of sediment supply to flood duration, so a sediment-rich river with short floods deposits less than a moderate one with long floods.
01Mechanism
Deposition requires sediment to settle during inundation; the ratio sets the mass delivered per event.
02Prediction
Deposition should track the ratio.
03Refutation
Deposition tracking flood magnitude would remove duration.