impacts of growth on swpp - southwest water authority
TRANSCRIPT
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Southwest Pipeline Project Impacts of Growth
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Oil wells drilled since 2007
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2010 2024 2038
Popu
la'on
Year
Rural
Stark County
Rural CommuniDes
Dickinson
Total
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Intake • Water Service Agreement with Basin Electric for their exisDng
intake which serves AVS, DGC. State’s cost was $4.2m • 1986 agreement only provides for 10,600 GPM to SWPP • Actual capacity dependent on lake level i.e. 11,600 GPM at 1811
(2008) Raw Water Main Transmission Line • Design Capacity of 9,150 GPM to Dickinson (13.2 MGD) • Leaves 1,450 GPM for Oliver Mercer Northern Dunn (OMND)
WTP -‐ Currently (2012) takes up to 2,800 GPM, (UlDmate 4,200 GPM)
Dickinson Water Treatment Facility • 12 MGD Facility
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2038 Demand Projec'ons 17,200 GPM for the Intake to OMND WTP 13,000 GPM for OMND WTP to Dickinson
Intake • Supplementary Intake needed as BEPC is reserving capacity (40kgpm)
Main Transmission Line (MTL) Facili'es • Parallel Pipelines • Pump StaDon Upgrades • Surge Control (Air Chamber) Upgrades Dickinson Water Treatment Facility • Expand/NEW for addiDonal Capacity
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Two Exis'ng Facili'es 1) Basin Electric Power Coopera've (BEPC) Intake Building • SWPP has one 100 HP and three 200 HP Pumps in Caisson 2) Adjacent SWPP Intake Booster Pump Sta'on • One 300 HP and three 600 HP Pumps • Surge Control Air Chamber, 1,850 cf
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Exis'ng Intake
• ExisDng Intake Agreement allows 10,600 GPM to SWPP
• Demand ProjecDons
• 17,200 GPM required for 2038 populaDon Supplementary Intake
• 7,000 GPM Secondary intake (Screen at 10,000 gpm)
• VerDcal Caisson (Horizontally DirecDon Drilled -‐ HDD)
• New 1,200 cf Surge Control Air Chamber
• 3 pumps at 600 HP
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Pipeline • 86.5 miles of 24”, 30”, and 36” DucDle Iron and Steel Pipe Pump Sta'ons • Dodge-‐ two 150 HP and three 700 HP Pumps • Richardton-‐ two 400 HP and three 900 HP Pumps Reservoirs • OMND WTP site-‐ Two 1 MG raw water steel ground storage res. • Richardton-‐ 1.3 MG steel ground storage reservoir • Dickinson-‐ 4.8 MG concrete reservoir Surge Control Air Chambers • One Air Chamber at the Intake BPS and one at Richardton BPS • Three underground Air Chambers, one US of Dodge and two DS
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Incrementally Parallel Pipelines as needed • 4 Miles of Paralleling between the Intake and OMND WTP • 5.5 Miles of Paralleling between OMND WTP and Dodge • 14.8 Miles of Paralleling between Dodge and Richardton • 6.5 Miles of Paralleling between Richardton and Dickinson Pump Sta'on Upgrades • Dodge – Replace three 700 HP pumps with 900 HP, add one 900 HP • Richardton – Replace three 900 HP pumps with 1200 HP Upgraded Surge Control Facili'es • New Richardton AC 1,400 cf and two new underground AC’s
between Dodge and Richardton, 1,050 cf and 1,700 cf
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Parallel Pipe
Parallel Pipe
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Exis'ng Facility • Built in 1951 (2 MGD), expanded in 1966 (6 MGD), 1988 • Converted to Missouri River water in 1991 • Capacity Upgrade in 1994 and Treatment Upgrade in 1996
increased capacity to 12 MGD • Allowed parallel operaDon of 8 MGD and 4 MGD Solids Contact Basins • Dual Media Filters with higher loading rate
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6 MGD of addiDonal Capacity Needed 1. Expansion of exisDng facility from 12 to 18 MGD 2. ConstrucDon of new Expandable 6 MGD Facility on
adjacent site 3. New 18 MGD facility at OMND 4. New 18 MGD facility to East of Dickinson
Also need a new Joint Finished Water Pumping Facility
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Dickinson WTP Site
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