Technical Abstract: Sediment P dynamics are a constantly changing group of parameters that control P concentrations in surface water. Removal of existing sediments and deposition of new sediments will change the physiochemical parameters controlling P transport in ditches, however these phenomenon are not well documented. This study was conducted to determine the impact of severe storms on sediment P dynamics in tile-fed drainage ditches within agricultural watersheds in Northeast Indiana. Exchangeable P in ditch sediments ranged from 0.5 to 1.32 mg/kg. The equilibrium P concentration (EPCo) in sediments ranged from 0.02 to 0.11 mg/L. When comparing the EPCo with soluble P in ditch water, sediments acted as a sink for P in five of the seven sites monitored. Phosphorus buffering capacity of sediments ranged from 2.7 to 13.8 L/kg, increases of four to ten times higher than the P buffering capacity observed at the same sites prior to sediment disturbance from the storms. Chemical amendments did not seem to induce tremendous changes in P kinetics. These data indicate that while chemical amendments can be used to reduce P transport in streams and ditches, this practice should be targeted to times of the year when they will be most effective. This research impacts land resource managers by demonstrating how storm events can impact nutrient transport in streams and ditches.