Report by Michael Lukyniuk at Annual Assembly, 2013
Last year, the provincial water agency – the
Centre d’expertise hydrique du Québec – agreed to change the operation of the
dam at Lac 31 Milles on a trial basis and to take measurements of the water
levels on the Gatineau River, our lake, Petit Lac Rond (aka, Lac des Pères),
and Lac Michel. This was done after our
Association presented persuasive data and arguments demonstrating that the
stability of Grand Lac Rond was being compromised through the operation of the
dam – in the spring and fall, discharges from the dam flood Grand Lac Rond; and
in the summer, the retention of water by the dam results in the lake being
drained by a creek into the Gatineau River.
The response of the CEHQ was very positive. Our
Association also received encouraging messages from the President of the
Association pour la protection du Lac des 31 Milles who supported our requests.
In 2012, we saw that the CEHQ stopped the
spring discharge from the dam one month earlier – which may have been the
reason why we were not flooded in April and May 2012. Throughout the summer of
2012, there was less precipitation than normal – and water levels were low but
stable. The levels could have been lower but the CEHQ released a continuous
flow of water from the dam. Normally, the CEHQ drops the water level on Lac 31
Milles in September to assist the spawning of lake trout there. Unfortunately,
this has often resulted in flooding on Grand Lac Rond. In 2012, the CEHQ began
the discharge gradually in mid-August so that there was no flooding on Grand
Lac Rond. (The level only rose by 27 cm in 2012 versus 52 cm in 2011 and 59 cm
in 2010!) Water levels were optimal in October 2012 due to discharge and
precipitation, and dropped gradually over the rest of the year.
During the winter of 2012-13, there was no
presence of red algae contrary to the case in 2011-12. We suspect that this was
because water levels were higher and that there were healthy levels of oxygen
in the water.
The spring of 2013 saw considerable flooding on
Grand Lac Rond due to a lot of snowfall during the winter and heavy
precipitation in the spring. This year, the CEHQ only stopped the spring discharge
in mid-April because of dangerous water volumes. To the end of June, water
levels were extremely high on Grand Lac Rond.
The CEHQ has confirmed that it is continuing to
monitor water levels in our water basin and that it is still testing the
operation of the dam. At the end of the year, it has promised to share a report
on its findings with the Association’s Board of Directors.
The instability of water levels on Grand Lac
Rond has been going on for decades to the detriment of the lake – the shoreline
is threatened by erosion, the warming of low water levels encourages the growth
of damaging aquatic plants and bacteria, and fluctuating levels pose hazards to
boating and inconveniences to residents. While it is not possible to control
precipitation, it is possible to manage man’s influence on the water basin.
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