Welcome to PondHawk® BRIEFS™ – Tangible Tools that Educate!

Each quarter we canvas the industry’s most reliable sources to bring you up-to-date and relevant information on aquatic research, Best Management Practices (BMPs) and methods that help keep your water assets healthy. Additionally, our BRIEFS are presented as concise summaries, giving you what you need to know quickly. Subjects range from water management & monitoring to water quality issues to pond habitat and more. All designed to keep you informed, knowledgable and current.

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How to Stop Ponds From Releasing Phosphorus

Authored by: Vinicius Taguchi, St. Anthony Falls Lab, University of Minnesota

Published: Webinar: Chesapeake Stormwater Network April 2019


Stormwater ponds are designed to leverage the natural relationship between phosphate, iron, and oxygen. In the presence of oxygen, iron maintains a 3+ charge, which binds it to the 3- charge of phosphate, allowing them to precipitate out of the water and remain in the sediment. However, in an anoxic environment with strong temperature stratification, the water does not maintain sufficient dissolved oxygen at the bottom, and iron changes to a 2+ charge. This no longer fits with the phosphate 3- charge so the iron and phosphate are released into the water. This webinar discusses the recent research on the impact of chloride introduced from winter road treatment, the relationship sheltering from trees has on stratification, and the importance of mixing the water column throughout the year.


PondHawk® BRIEFS™ (Beneficial Research Intended Exclusively For Superintendents) is provided by LINNE Industries, © 2018