Ausable Bayfield Conservation Authority

Loading Estimation Workshop

The Sharing Loading Estimation Experiences Workshop took place on January 20, 2015, in Guelph, Ontario.

The purpose of the workshop was to bring together people with varying levels of sediment and nutrient loading estimation experience in order to share relevant knowledge.

Sediment or nutrient loading is the mass of sediment or a nutrient that enters a waterbody, or passes a cross-section of a stream, in a specific period of time (e.g., a year, season, or high-flow event).

The workshop was attended by 46 people, who represented 17 organizations.

The day’s agenda included presentations on a current initiative in Ontario to update and improve loading estimates for tributaries of the Great Lakes, lessons from historical loading estimations in Ontario, and methods that have been used more recently for estimating loads in Ontario, as well as a discussion about how to approach loading estimations for two case studies.

Please find below links to the workshop proceedings and presentations, and to other documents about loadings.

Workshop Proceedings

Workshop Presentations

Introduction to the Multi-Watershed Nutrient Study – Mohamed Mohamed, Surface Water Scientist, Ontario Ministry of the Environment and Climate Change

Lessons from loads – Trevor Dickinson, Professor Emeritus, University of Guelph

An empirically-based regression method for estimating total phosphorus loads to Hamilton Harbour from the four tributary inputs – Tanya Long, Environmental Scientist, Ontario Ministry of the Environment and Climate Change

Regression-based loading estimates applied in small, agricultural watersheds – Mohamed Mohamed, Surface Water Scientist, Ontario Ministry of the Environment and Climate Change

City of Toronto Wet Weather Flow Monitoring Network: Baseline conditions 2008 to 2011 – Derek Smith, Surface Water Field Coordinator, Ontario Ministry of the Environment and Climate Change

Lake Erie loadings estimations in support of the Great Lakes Nutrient Initiative – Alice Dove, Environmental Scientist, Environment Canada

Optimization of water quality sampling and load estimation modeling in the Lake Simcoe watershed: Evaluations using a continuous phosphorus dataset – Eavan O’Connor, Water Quality Specialist, Lake Simcoe Region Conservation Authority

Case Study #1: Predicting blue-green algae blooms at a Wheatley drinking water intake in western Lake Erie – Chitra Gowda, Source Water Protection Lead, Conservation Ontario; Katie Stammler, Water Quality Scientist and Source Water Protection Project Manager, Essex Region Conservation Authority

Case Study #2: Evaluating stewardship actions for Healthy Lake Huron – Mari Veliz, Healthy Watersheds Supervisor, Ausable Bayfield Conservation Authority

Introductory Loading Documents

A brief introduction to loading estimation approaches

Estimation of pollutant loads in rivers and streams: A guidance document for NPS programs – Richards 1998

Load estimation techniques – United States Environmental Protection Agency 2003

Other Relevant Documents

Comparison of load estimation methods and their associated error – Marsh and Waters 2009

Inventorying urban phosphorus loads: A report to the Bi-National Annex 4 Municipal and Rural Non-Farm Task Group – McElmurry 2014

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