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Water Management Water Management of Turtle Lake of Turtle Lake
WatershedWatershedSept 29, 2007Sept 29, 2007
by by Don DillDon Dill
PresentationPresentation Outline Outline
Watershed CharacteristicsWatershed Characteristics
SWA –Sask Water SWA –Sask Water Involvement with Water Involvement with Water Levels since 1984Levels since 1984
Roles SWA Plays in Water Roles SWA Plays in Water Management in WatershedManagement in Watershed
QuestionsQuestions
Watershed Watershed characteristicscharacteristics Gross Drainage Area Gross Drainage Area 649 km 649 km 22
Effective Drainage Effective Drainage Area Area 555 km 555 km 22
Area of Turtle Lake Area of Turtle Lake 64 km 64 km 22
Net evaporation Net evaporation About 340 mmAbout 340 mm
Watershed Watershed CharacteristicsCharacteristics
Inflow Volumes (1 dam = 1000mInflow Volumes (1 dam = 1000m3 3 or 220,000 or 220,000 gallons)gallons)
Volumes (damVolumes (dam3)3) Peaks (m Peaks (m33/sec)/sec) 1: 2 18,700 5.61: 2 18,700 5.6 1:5 26,800 9.01:5 26,800 9.0 1:10 33,000 12.01:10 33,000 12.0 1:25 42,000 15.51:25 42,000 15.5 1:50 49,000 20.01:50 49,000 20.0 Annual net evaporation = 21,200 dam Annual net evaporation = 21,200 dam 33
Water Level PeaksWater Level Peaks
Water level peak this year 655.24 m.Water level peak this year 655.24 m.
1:100 peak water level 655.16 m.1:100 peak water level 655.16 m.
used in hydrology used in hydrology
studiesstudies The 1:00 level is being reviewed to The 1:00 level is being reviewed to
determine if changes need to be made.determine if changes need to be made.
Historical Water LevelsHistorical Water Levels
Outlet of Turtle Lake Outlet of Turtle Lake
April 1990
Silt from ditching carried Silt from ditching carried out July 19, 1984out July 19, 1984
Obstruction placed July Obstruction placed July 19, 198419, 1984
Obstruction May 25, 1985Obstruction May 25, 1985
Obstruction in Channel Obstruction in Channel May 28, 1985May 28, 1985
Outlet July 16, 1985Outlet July 16, 1985
Sask Water Timber WeirSask Water Timber Weir
Overflow elevation varied between Overflow elevation varied between 654.62 m. and 654.93 m. between 1970 654.62 m. and 654.93 m. between 1970 and 1984.and 1984.
Set weir at historical average levelSet weir at historical average level Set at 654.78 m.Set at 654.78 m. Supposed to be temporary until Supposed to be temporary until
consultation completed and new consultation completed and new structure designedstructure designed
Temporary Wood Structure Temporary Wood Structure Installed April 25, 1986Installed April 25, 1986
Temporary Wood Strucutre Temporary Wood Strucutre Installed April 25, 1986Installed April 25, 1986
Planning Study Initiated Planning Study Initiated in 1986in 1986
Public Opinion Survey carried out in June Public Opinion Survey carried out in June of 1986of 1986
Public Meetings held in the summer of Public Meetings held in the summer of 1986.1986.
Petitions circulated with hundreds Petitions circulated with hundreds
signing to object to the elevation of the signing to object to the elevation of the timber weir ( too low)timber weir ( too low)
Lots of consultation but no consensusLots of consultation but no consensus
Watershed Authority Watershed Authority Water Management RolesWater Management Roles
Regulate Water UseRegulate Water Use Example water lines into cabins Example water lines into cabins
Regulate Drainage Activity Regulate Drainage Activity Example farm drainage or diversions for Example farm drainage or diversions for flood control.flood control.
Deal with Drainage ComplaintsDeal with Drainage ComplaintsExample – municipalities impounding Example – municipalities impounding
water with road gradeswater with road grades
Watershed Authority Watershed Authority Water Management RolesWater Management Roles
Deal with Water Management InquiriesDeal with Water Management Inquiries Example municipalities seeking advice on Example municipalities seeking advice on
proper placement of culvertproper placement of culvert
Review sub division applications and advise on Review sub division applications and advise on Estimate Peak Water Levels (Vary between 656.65 Estimate Peak Water Levels (Vary between 656.65 and 655.7 m. for various locations around lake )and 655.7 m. for various locations around lake )
Review Forest Management PlansReview Forest Management Plans
Review projects going through the Environmental Review projects going through the Environmental Assessment ProcessAssessment Process
Changing Watershed Changing Watershed from Forest Harvestingfrom Forest Harvesting
White blocks areas White blocks areas
north and east of lake north and east of lake
are harvested are harvested
areas in 1990 areas in 1990
Watershed Authority Watershed Authority Water Management RolesWater Management Roles
Undertake water quality monitoring with Undertake water quality monitoring with Stewardship groupsStewardship groups
Provide advice and assistance to protect Provide advice and assistance to protect riparian areasriparian areas
Take a lead role in preparing Source Take a lead role in preparing Source Water Protection plans for the north Water Protection plans for the north Sask. Watershed including Turtle Lake Sask. Watershed including Turtle Lake
Main Role of SWAMain Role of SWA
We are working on behalf of you to We are working on behalf of you to protect surface and groundwater supplies protect surface and groundwater supplies and quality.and quality.
Your views and comments are essential Your views and comments are essential for successful management of our water for successful management of our water resources resources
QuestionsQuestions