(These reports are available for view or download in pdf format.)

Water Related

Sustainable Water Management Strategy

St. Mary Lake Hydrology Report  – St. Mary Lake Watershed Water Availability and Demand – Climate Change Assessment: Kerr Wood Leidal; Craig Sutherland, M.Sc., P.Eng. and Wendy Yao, M.A. Sc., P.Eng., June 2015

Maxwell Lake Hydrology Report  – Maxwell Lake, Rippon Creek and Larmour Creek Watersheds Water Availability – Climate Change Assessment: Kerr Wood Leidal; Craig Sutherland, M.Sc., P.Eng. and Wendy Yao, M.A. Sc., P.Eng., April 2015

Phosphorus Sources and Sinks at St. Mary Lake, Salt Spring Island, B.C.Results of the 2014-15 Special Study & Analysis of 40-years of Water Quality Data; Maggie Squires, Ph.D., Water Matters Consulting, September 20, 2017

Internal Phosphorus Loading in Lakes: How It Works and Why Artificial Aeration Doesn’t Work; Maggie Squires, Ph.D., Water Matters Consulting September 20, 2017

Salt Spring Island 2015 Drought Study

Can biomanipulation reduce algal biomass in St. Mary Lake?  An assessment of trophic levels & potential interactions in the context of physical, chemical, and biological regimes in St. Mary Lake, by Dr. Maggie Squires, PhD, limnologist, January 16, 2016

A Guide To St. Mary LakeUse, Misuse, & Disuse of Artificial Aeration, plus What’s Normal for St. Mary & Recommendations for Lake Research, by Dr. Maggie Squires, PhD, limnologist, February 2016


To the Community of Salt Spring Island,

June 2015

In 2013, North Salt Spring Waterworks District engaged Kerr Wood Leidal Consulting Engineers to assess water availability to meet the District’s licensed allocation for both St. Mary and Maxwell Lakes.

These investigations examined the specific cases of average rainfall, and a single drought year followed by an average year. Recent experience has shown, however, that we are now experiencing low rainfall years in succession. There is certainly the possibility that level 3 or 4 drought conditions could occur in close proximity, with the result that the lakes do not re-fill (spill over the weir) each year. Such events are very dire, and indicate that there is much less water available than previously thought, requiring very careful planning by the District.

In response, NSSWD has developed a Sustainable Water Management Strategy, outlined in the document below. It clearly lays out what steps, to-date, the District has taken in response to the conclusions and recommendations in the reports, and its assessment of recent trends in rainfall over the past decade. In addition, it identifies further efforts and initiatives required by the District, such as the raising the Duck Creek Weir, working with other agencies to calculate current and future water demand, continued conservation awareness and adopting a precautionary approach to additional water services.

These are the first steps in an ongoing process to manage the water available, under license, to NSSWD. Going forward, environmental monitoring at both Maxwell and St. Mary Lakes will continue in order to improve our current understanding and facilitate implementation of our management plan.

If you have questions or comments please direct them to the to the Board of Trustees by email or letter addressed to 761 Upper Ganges Road, Sslt Spring Island, BC V8K 1S1

Board of Trustees

Other Topics

Report to the Board of Trustees: Lakeshore Property Owners Liaison, Consultation, and Remediation Design Project – Fletcher & Company Municipal Consulting Inc., 2016

Recommendations for NSSWD Parcel Tax Reform – InterGroup Consultants Ltd. 2016