Markham Staff Presentation to General Committee June 15 2020
The following presentation was made by Rob Grech, Manager Stormwater Management, City of Markham Markham Staff Report_Swan Lake Water Quality Improvement Program
Management Goals For Oxygen Levels
Swan Lake is essentially a stagnant pond, without any surface levels inflows of freshwater. The local aquifer adds about 15% in freshwater each year with the balance of freshwater rising from rainfall. Dissolved Oxygen is the amount of oxygen dissolved in lake water. Living organisms breathe in oxygen that is dissolved in the water. Dissolved
Fish Management Goals
The original design of Swan Lake included environmental elements to support a healthy fish habitat. Early reports cite Swan Lake as supporting pumpkinseed sunfish, fathead minnows and largemouth bass (believed to have been stocked prior to 1992 by TRCA). Many fish died prior to the Phoslock treatment in 2013. Establishing a healthy aquatic environment for
Management Goals For Water Quality
It is important that the City commit to defining what they think success looks like. Scientists have developed a rating system for lakes that can be used to set out measurable goals. Water Quality and Community Role Scientists categorize water quality environments into “Trophic States”. Swan Lake is categorized as a hypereutrophic lake, the lowest
Markham Council Actions Initiated in 2020
In 2020, the City of Markham Council recognized the need to address a variety of the issues in the Park and authorized three programs that will immediately address some of the critical issues: Approved a treatment of Phoslock for Swan Lake in spring of 2021, a chemical treatment that will help minimize the current excessive
Markham Council Initiates First Steps Toward Restoration
At a meeting on June 23, 2020, Markham Council approved the first steps towards a program for long term improvement of water quality in Swan Lake. In the spring of 2021, a chemical treatment to improve water quality levels is planned. City staff will be reporting back to Council by February 2021 on what treatment
Remember the Good Old Days – Lakeview June 2020
Remember the Good Old Days_Lakeview June 2020 Photo courtesy of Markham Review.