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Province of Manitoba » Water Stewardship » Water Information » Flood Forecasting Reports »
Flood Report for Southern Manitoba - May 24, 2006
Water Information
FLOOD UPDATE FOR MANITOBA
May
24, 2006.
A flood sheet for the
Assiniboine River for May 24, 2006 is attached. It also shows conditions and
forecasts for the Red River in Winnipeg and for Red Deer Lake.
Levels of the Assiniboine
River declined 0.5 to 0.8 feet from Miniota to Brandon in the 24 hour period
ending this morning. Elsewhere levels declined more slowly.
The river is now well within
its banks at all points with the exception of the Shellmouth area. Portions of
the Assiniboine Valley which were flooded until late last week may require one
to two weeks of favourable weather to drain and dry before seeding is possible.
Rainfall during the next few weeks will be very important in determining whether
a crop can still be seeded before the insurance deadlines pass
The water level of Shellmouth
Reservoir declined 0.07 feet in the 24 hour period ending this morning. The
inflow this morning was 1470 cfs while the outflow was 2010 cfs. The conduit
will remain closed until the spillway flow has decreased to 1300 cfs at which
time the outflow will be held at 1300 cfs until the reservoir water level falls
to 1405 feet or so.
There has been some heavy
rain in the headwater area of the Assiniboine River in the past 24 hours, which
has resulted in a sudden rise of the river at Sturgis, SK overnight. It is not
yet known how much rain fell and how high the river will rise. However it
appears that inflows to Shellmouth Reservoir will increase temporarily and this
will further delay the recession to below bankfull conditions just downstream of
the Reservoir. Additional rain expected today and on the weekend may cause
reservoir levels to rise next week. Despite the rain the Assiniboine River is
likely to remain below bankfull from Millwood to Winnipeg.
The Portage Diversion
continues to be operated to reduce levels of the Assiniboine River from Portage
la Prairie to Winnipeg. Diversion flows should decline to zero before the end of
May unless heavy rain develops.
The level of Red Deer Lake
declined only 0.03 feet at the community of Red Deer Lake since yesterday, but
the minor decline may have been influenced by wind. Manitoba Emergency
Management staff met with officials from ANA and INAC late last week to plan the
clean up and recovery process at the Community. Restoration of the power and
water supply systems and a check on surface contamination are among the first
issues to be dealt with. A further decline in water levels will be needed before
the clean-up can proceed in all areas.
The level of the Red River in
downtown Winnipeg has declined to 9.7 feet, which is 3.4 feet higher than the
normal summer level. The Forks walkways should be clear of water near the end of
May.
Scattered showers and
thundershowers are expected to continue today, especially in western Manitoba
and eastern Saskatchewan as far north as The Pas. There is a high probability of
rain again on Friday. Western Manitoba and eastern Saskatchewan may
receive additional rain Sunday to Monday.
Hydrologic Forecast Centre,
Water Branch,
Manitoba Water Stewardship
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