Water was then removed, and "clean" water (no P added) was used for a desorption experiment, lasting 1 d. The sediments were placed in a stream simulator, and stream water was loaded with 0.55 mM P for 5 d (adsorption experiment). Ditch sediments were collected from a drainage ditch in northeastern Indiana immediately before and after dredging.
This laboratory study was conducted to determine the impact of ditch dredging on soluble phosphorus (P) transport.
These ditches are designed to remove water from fields as quickly as possible, and sediment buildup necessitates dredging, to ensure adequate water removal. Managed drainage ditches are common in the midwestern United States.
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