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Sandy Lake, Hammonds Plains
Soil & Water Conservation Society of Metro Halifax (SWCSMH)
Updated: August 12, 2015
Chemical vs Biological monitoring
Select scientific modelling and chemical/biological limnology are part of our miscellaneous archives
The Sackville River watershed flow chart; peruse our predictive modelling, and view a relevant model; the paleolimnology of lakes in the HRM
SANDY LAKE, Glen Arbour:- Accelerated eutrophication based on the developer’s data of 1996-99, and HRM’s synoptic data of 2006-2011; September 19, 2013
Deep station total phosphorus (TP)- comparison with our hindcast models; October 18, 2013
Details on LCC (Lake Carrying Capacity)/Threshold values of lakes, and
comparison with artificially high values chosen by the HRM; March 14, 2014
Sandy Lake, Hammonds Plains is part of the
watershed of the Sackville River. During Fall 1996, the field chemical
data showed Sandy Lake to be almost at its natural background modelled values.
But Sandy Lake underwent a remarkable accelerated eutrophication during
the extremely short period of 1997-1999, a process which normally takes
tens of thousands of years, if at all.
Applied Limnologist, Shalom M. Mandaville, of the SWCSMH did indeed forewarn the HRM at the public hearing (see page-8 of the formal minutes of the HRM).
This once again proves that HRM badly needs a credible and a pragmatic Lakes Authority.
An appeal to the Minister of Environment:
We had anticipated the problems even prior
to the development dating back to the summer of 1996. Since the benthic
surveys were not conducted, even if Sandy Lake recovers to its
pre-development 1996 nutrient and chlorophyll a values, one can never be confident if the benthos has recovered.
As a result we appealed to
Minister of the Nova Scotia Department of the Environment with a
comprehensive brief on probable solutions and leading protocols. The Minister refused; Sept., 10, 1997.
The field data supplied by the proponent to the HRM plotted on our management model for Sandy Lake:
As per the proponent's own data supplied to
the HRM under a legal agreement, Sandy Lake (Hammonds Plains) was
ultraoligotrophic (totally undisturbed) prior to the development in the
Fall of 1996. One can also observe in the Predictive TP/Ch-a model
developed by us (SWCSMH), the field data of the proponent was in acquiescence with the theoretical model developed by Shalom M. Mandaville of the SWCSMH!
We had also supplied the HRM
approximately three (3) scenarios and by memory two (2) of the
scenarios predicted the inevitable rapid cultural eutrophication of
this once pristine lake. Now time will only tell if it will ever revert
back to the Fall 1996 state which can only be confirmed by similar
sampling preferably at the same times.
Multitude of concerns
Concerns of the Halifax Watershed Advisory Board (HWAB):
Communication from His Worship dated April 17, 2001:
Communication from the Regional Operations, HRM dated January 27, 1999:
Google Earth for the maps