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Appendix D Water Supply AECOM Alberta Flood Recovery Task Force Appendix D – Water Supply Appendix D Water Supply RPT3-2014-06-06-App_D_Sheep_River_Water_Supply.Docx AECOM Alberta Flood Recovery Task Force Appendix D – Water Supply Table of Contents page 1. Background ...................................................................................................................................................... 1 2. Communities’ Water Sources ......................................................................................................................... 2 2.1 Communities’ Water Sources Affected due to the June 2013 Flood .................................................... 2 2.1.1 Town of Okotoks ...................................................................................................................... 2 2.1.2 Town of Turner Valley.............................................................................................................. 2 2.1.3 Town of Black Diamond ........................................................................................................... 3 2.1.4 Hamlet of Millarville .................................................................................................................. 3 3. Summary Table of Communities’ Water Sources and Locations ............................................................... 7 4. References ....................................................................................................................................................... 8 5. Sign-Off ............................................................................................................................................................. 9 List of Figures Figure 2-1: Communities in the Highwood and Sheep River Basin ............................................................................. 4 Figure 2-2: Water Supply Infrastructure at Okotoks ..................................................................................................... 5 Figure 2-3: Water Supply Infrastructure at Black Diamond and Turner Valley ............................................................ 6 List of Tables Table 3-1: Water Sources, Water Treatment Plants, and Pump Stations Locations ................................................... 7 RPT3-2014-06-06-App_D_Sheep_River_Water_Supply.Docx AECOM Alberta Flood Recovery Task Force Appendix D – Water Supply 1. Background The Sheep River originates in the Canadian Rockies Kananaskis area from Rae Creek. The river flows east through the Towns of Turner Valley, Black Diamond, and Okotoks and joins the Highwood River near Aldersyde. Threepoint Creek, a major tributary to Sheep River, joins the Sheep River between the Towns of Black Diamond and Okotoks. In the June 2013, southern Alberta experienced extensive flooding of the Sheep River which impacted several communities’ water sources along the river. As a result, communities’ water sources impacted due to the June 2013 flood in the Sheep River Basin were investigated including: water source damages, repair, mitigation, and interdependencies. The information was obtained by correspondence, phone or e-mail with communities, municipalities and water treatment plant personnel. The purpose of investigating communities’ water sources was to identify those communities most at risk due to future flood or drought conditions and is summarized in Section 3 of the main body of the report. RPT3-2014-06-06-App_D_Sheep_River_Water_Supply.Docx 1 AECOM Alberta Flood Recovery Task Force Appendix D – Water Supply 2. Communities’ Water Sources The following section contains communities’ water sources that could have potentially been impacted due to the June 2013 flood in the Sheep River Basin and are shown on Figure 2-1. Communities outside the flood hazard area, but that could be dependent on flood affected communities, were also considered. Rural communities that are dependent on private wells, surface water, or have water trucked in that are far beyond the flood hazard area were not investigated further in this study. All information about the communities was obtained by correspondence with communities, municipalities, and water treatment plant personnel. 2.1 Communities’ Water Sources Affected due to the June 2013 Flood 2.1.1 Town of Okotoks The Town of Okotoks draws its water from the Sheep River via 12 active wells. Wells 7 to 10 are located in an area at the west border of the town and directly south of the river where Highway 549 and the river are approximately parallel to each other. Wells 1 to 6 are located in an area directly south of the Sheep River that is in line with the Okotoks Public Library. Okotoks’ wells are shown on Figure 2-2. Well 1 was lost during both the 2005 and June 2013 floods and was subsequently relocated in close proximity after each flood event. Well 1 was relocated within approximately 20 feet after the June 2013 flood and scheduled to be operational in March 2104. The replacement well will have a lower capacity and so a supplemental well may be required. All wells suffered from high turbidity levels and stayed above normal until approximately July 2013. The high turbidity levels increased the load on the Water Treatment Plant’s filters; however, they did not impact treated water production. There were no water supply interruptions or water restrictions issued to the Town of Okotoks due to the June 2013 flood. Rip rap was washed out in the water reservoir during the June 2013 flood and was restored. Okotoks is currently investigating additional water supply options to satisfy an increasing water demand due to population growth. Options to expand water supply include: treated water from Calgary, increase raw water supply from the Bow River or Highwood River (BSEI Municipal Consulting Engineers, 2013). 2.1.2 Town of Turner Valley The Town of Turner Valley had three active water wells directly north of Sheep River prior to the June 2013 flood that supplied the town and a few acreages north of the town with water and are shown on Figure 2-3. Wells 5 and 8 were lost and production from Well 7 was halted due to the June 2013 flood. The town’s raw water reservoir was at full capacity during the June 2013 flood and half of the volume was used before pumping of raw water to the reservoir from any wells or an infiltration pit was resumed. Raw water was diverted from an infiltration pit next to Sheep River to the raw water reservoir from July to November 2013 to recharge the reservoir in the interim until well production could be resumed. Well 7 resumed production in August 2013 and an emergency water line was installed from Well 7 to the raw water reservoir at the water treatment plant. Pumping of raw water from the infiltration pit to the raw water reservoir was halted when a replacement well 5 A was drilled and operational in November 2013. RPT3-2014-06-06-App_D_Sheep_River_Water_Supply.Docx 2 AECOM Alberta Flood Recovery Task Force Appendix D – Water Supply The Town of Tuner Valley currently has two active wells; namely, Wells 5 A and 7 located approximately 100 m north of Sheep River in the centre of the town. Wells 2, 3, and 7 are inactive and on standby, and Well 6 is inactive and has no water license associated with it. The Town has issued water restrictions since the June 2013 flood which will be lifted when an additional raw water source is obtained to meet the water demand. Water restrictions include: no outside water usage (lawn watering, hot tubs) and full loads of laundry, minimal inside use (quick showers, flush toilet only when necessary). The water supply was not interrupted due to the June 2013 flood since the raw water reservoir could satisfy the water demand in the interim. 2.1.3 Town of Black Diamond Town of Black Diamond had three wells and a water treatment plant north of the Sheep River prior to the June 2013 flood. Wells 1 and 2 and the water treatment plant were lost due to the June 2013 flood. The Town of Black Diamond may use the remaining Well 3 as a source of non-potable water in the future; however, no plans have been made. A 4 inch fire hose was connected and laid overland from Turner Valley to temporarily supply Black Diamond with treated water during the June 2013 flood. A permanent water supply line has been installed, withdrawing treated water from the Town of Turner Valley. The permanent supply line connects to Turner Valley’s Water Treatment Plant and was installed along 16th Avenue going east and proceeds north along Highway 2, where treated water is supplied to the Town of Black Diamond. Black Diamond is under water restrictions until additional water sources are implemented to meet the water demand. Water restrictions include: no outside water usage (lawn watering, hot tubs) and full loads of laundry, minimal inside use (quick showers, flush toilet only when necessary). Black Diamond has cut down on water usage by approximately 30%. 2.1.4 Hamlet of Millarville The Hamlet of Millarville has water trucked in due to well water quality issues that are unrelated to the June 2013 Flood event, according to the MD of Foothills. One community well along Threepoint Creek was identified from documents provided by the MD of Foothills. Additional information was unavailable from the MD of Foothills. Damages, effects and mitigations measures pertaining to Millarville’s water supply due to the June 2013 flood could not be determined since there was no other contact was available for Millarville at the time of the investigation. RPT3-2014-06-06-App_D_Sheep_River_Water_Supply.Docx
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