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This executive summary explains how optimizing the design of water retention projects in the Canadian Prairies can maximize phosphorus reduction to prevent algal blooms. Using data from the De Salaberry project (2019-2023), the authors demonstrate that increasing hydraulic retention time through strategic design changes, such as modifying outlet culvert diameters, significantly improves phosphorus removal. The report recommends integrating quantitative phosphorus reduction estimates into planning, targeting phosphorus hotspots, and developing practical tools for engineers to balance water quality with flood mitigation.

The 'Essential Monitor’s Guide for Prairie Water Retention' is a technical guidebook published by the International Institute for Sustainable Development (IISD) in February 2024. It provides a framework for monitoring the water quantity and quality of water retention projects—natural infrastructure designed for flood and drought mitigation, water quality improvement, and biodiversity enhancement. The guide details the necessity of water and contaminant mass balances, recommends specific monitoring tools and equipment, and explains how to use rating curves and automated samplers to collect data in the challenging environments of the Canadian Prairies.