Tacoma Water

Water Supply Management

Presented by Tyler Patterson Fisheries Biologist August 9th, 2018

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

Tacoma Water Diversion Dam

Howard Hanson Dam

Municipal Watershed Land Ownership

Tacoma Water Diversion Dam

Howard Hanson Dam

147,000 total acres, Tacoma owns 11% or 16,000+ acres

1920s Green River Treatment Facility

Chlorine Gas

Raw Water Treated Water

Green River Filtration Facility

Today

NF Green River Wellfield Water

Green River Surface Water

Green River

Treated Water to Town

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

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)

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)

Reservoir Pool Water Allocations

Tacoma Water’s

(Currently donating 10K ac ft annually for fish conservation)

Tacoma Water HCP

50 Year Commitment

https://www.washington.edu

32 Species

66 Habitat Conservation Measures

Restore Fish Passage

Diversion Dam Intake

1920s Tacoma Water Municipal Intake

Raw water pipeline

Today

Diversion Dam

Intake

Adult Fish Ladder

Juvenile Bypass

Adult Trap and Haul Facility

Raw Water Pipeline

Juvenile Fish Screen

Tacoma Water Municipal Intake

• 30 projects completed • >23 miles of habitat opened • $4.2 million spent

Fish Passage Barrier Corrections Since 2001

Fish Habitat Restoration

Thank you