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Morris Lake, Dartmouth

Soil & Water Conservation Society of Metro Halifax (SWCSMH)

Upadated: March 09, 2014      Cow Bay River homepage

Caution: Since Morris is a shallow lake, the standard limnetic (i.e., open water) trophic parameters may not represent the true trophic status of the lake

Acknowledgements


Contents


Water Quality

Chemical vs Biological monitoring


Select scientific modelling and chemical/biological limnology are part of our miscellaneous archives


The bathymetric map; the morphological data; the watershed map; the location map; the flow chart of the Cow Bay River watershed; the paleolimnology of lakes in HRM




Research biologist, Kim Hynes, of Ontario carrying out preliminary soundings prior to sublittoral benthic studies

Future and monitoring:

It is hoped that further investigations will be carried out by us along with chironomid mentum deformity studies of this valuable urban lake.

Since Morris is a shallow lake, the standard limnetic (i.e., open-water or pelagic) trophic parameters may not represent the true trophic status of the lake.

The limnetic parameters may not reflect changes in the watershed unless those changes are significant in relationship to the overall size of the watershed and/or in its prevailing inputs!

To reliably ascertain incremental inputs from new developments, outflows of every storm pipe outlet, of in-situ devices (e.g., CDS, Stormceptor or Vortechnics), of constructed wetlands outlets, and others have to be monitored almost on an hourly basis during runoff, and pollutographs have to be developed.



Total stormwater treatment recommended:

Total stormwater treatment should also include removal of other urban pollutants as well, not just phosphorus! The CDS technology, the Stormceptor, and the Vortechnics are superb devices for pre-treatment, but they have to be followed by sophisticated polishing systems, for example a scientifically designed wetland with the attendant maintenance in perpetuity! This combination may or may not work (see the note of caution)!

A note of caution: There have been conflicting results in the long term removal of typical stressors in storm drainage using constructed (or engineered) wetlands. Further, such wetlands have not had a successful history in the amelioration of acid drainage in HRM. Hence, the only sustainable methodology would be treatment of urban and suburban stormwater by traditional wastewater treatment plants (WWTP) based on the tertiary removal process in the case of stressed lakes! This implies considerable capital costs and operation & maintenance!

The other option is to disallow any further development similar to what residents in Lower Sackville triumphed at Second Lake after years of intense lobbying! Even there, significant amount of chemical and biological limnology was conducted by us!



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Events relating to the HRM's regulatory process




Public Info meeting w.r.t the Morris-Russell Lakes Stormwater Management Plan. Only relevant parts of the HRM's recorded minutes of interest to us have been inserted here in order to economize on web space; June 27, 2001:

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Public Info meeting w.r.t Phase-1 of Portland Hills. Only relevant parts of the HRM's recorded minutes of interest to us have been inserted here in order to economize on web space; May 31, 2000:

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Concerns of stakeholders (there were many others during the early 1990s)


Acknowledgements

Google Earth for the maps!


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