presented by tyler patterson fisheries biologist august 9 ... · 8/6/2018 · fisheries biologist...
TRANSCRIPT
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Tacoma Water
Water Supply Management
Presented by Tyler Patterson Fisheries Biologist August 9th, 2018
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2nd Diversion Water Right (1986)
Pipeline 5 2005 - $136M (100 cfs)
1st Diversion Water Right (1912)
Pipeline 1 (113 cfs)
Environmental Mitigation
(MITA/HCP/AWSP)
COMPONENTS OF THE GREEN RIVER SUPPLY AND SERVICE AREA
320K direct customers 200K wholesale and partner connections Large commercial & industrial customers
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Tacoma Water Diversion Dam
Howard Hanson Dam
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Municipal Watershed Land Ownership
Tacoma Water Diversion Dam
Howard Hanson Dam
147,000 total acres, Tacoma owns 11% or 16,000+ acres
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1920s Green River Treatment Facility
Chlorine Gas
Raw Water Treated Water
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Green River Filtration Facility
Today
NF Green River Wellfield Water
Green River Surface Water
Green River
Treated Water to Town
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Tacoma Water’s Surface Water Rights on the Green River
First Diversion Water Right Pipeline 1 1906 400 cfs Now (MITA, HCP) 113 cfs NF Well Field 110 cfs* *Only used to blend with surface water above 5 NTU, combined cannot exceed 113 cfs Second Diversion Water Right (1986) Pipeline 5 100 cfs** **first exercised in 2006
Location August 6, 2018* Peak Day Demand*
Pipeline 1 93 cfs 93 cfs
NF Well Field 0 cfs 0 cfs
Pipeline 5 56 cfs 117 – 136 cfs
Combined 149 cfs 167 – 186 cfs
*Must meet minimum flow requirement of 250 cfs at Auburn
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First Diversion Water Right Instream Flow Commitment
(min. 250 cfs at Auburn)
Year
Augmentation Period Flow Statistics at the USGS Auburn
Gage
Start End Mean Minimum Maximum 2012 July 15 November 4 637 340 4,080
2013 July 15 November 14 712 281 3,040
2014 July 15 November 18 779 345 2,810
2015 July 15 November 2 454 226* 5,840
2016 July 15 November 19 814 322 2,990
*USGS rerated the Auburn gage because it was off by 50 cfs.
MIT Agreement (1995) and HCP (2001)
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Additional Water Storage Project
• Tacoma Water needed additional water for its Second Supply Project (SSP)
• Corps raised HHD spring pool by 20 ft in 2007
• 20,000 acre feet of municipal & industrial water storage for Tacoma Water’s (SSP)
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Reservoir Pool Water Allocations
Tacoma Water’s
(Currently donating 10K ac ft annually for fish conservation)
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Tacoma Water HCP
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50 Year Commitment
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https://www.washington.edu
32 Species
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66 Habitat Conservation Measures
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Restore Fish Passage
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Diversion Dam Intake
1920s Tacoma Water Municipal Intake
Raw water pipeline
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Today
Diversion Dam
Intake
Adult Fish Ladder
Juvenile Bypass
Adult Trap and Haul Facility
Raw Water Pipeline
Juvenile Fish Screen
Tacoma Water Municipal Intake
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• 30 projects completed • >23 miles of habitat opened • $4.2 million spent
Fish Passage Barrier Corrections Since 2001
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Fish Habitat Restoration
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Thank you