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Flocculation is the process where multiple particles are bridged together to form flocs or flakes. Flocculants added to stormwater runoff during flocculation the process enhance the binding effect of multiple particles to each other, thereby improving the size and particle settling velocity. Flocculants are characterized as both natural and synthetic in nature. Natural flocculants include: glues, gum, and starch. Synthetic flocculants include polyacrylamide monomer. Flocculation allows sediments to settle and controls turbidity at construction sites.

Fact Sheets

Flocculants and Polymers, Michigan Department of Environmental Quality

Using Flocculants to Reduce Construction Pollution, Minnesota

Flocculation of Construction Site Runoff in Oregon, Sisul Engineering Oregon

Polymers Coagulants/Flocculants for Sediment Control, Greenvile County, South Carolina

Handbooks and Dissertations

Sediment Basin Design Criteria for Flocculated Sediment , Research Report for North Carolina Department of Transportation

Measurement and Prediction of Chemical Flocculation for Sediment Control in Flowing Water, Doctoral Dissertation, Neha Bhadbhade, Oklahoma State University

Evaluation of the Performance of Flocculation to Eliminate Sediment Trap Efficiency, Master's Thesis, University of Kentucky


Flocculants, Polyacrylamide polymer rainfall erosion test, Stormwater Academy University of Central Florida