naches river water treatment plant screen project why did the city install a screen? september 13,...
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Naches River Water Treatment Plant Screen
Project
Naches River Water Treatment Plant Screen
Project
Why did the City install a Screen?
September 13, 2006David Brown
Water/Irrigation Division Manager
Naches River Water Treatment Plant Screen Project
Naches River Water Treatment Plant Screen Project
Water Treatment Plant and Intake Structure built in 1969 – 1970
Moved to present location from Oak Flats Plant put on line in 1972 Idea was that water supply for the WTP would be from
PP&L’s Wapatox CanalTown of Naches Waste Water Effluent would be bypassedFish and debris screening done at Wapatox Canal diversion
Naches River Water Treatment Plant Screen Project
Naches River Water Treatment Plant Screen Project
As the issue of returning fish surfaced John Easterbrook was instrumental in the installation of upstream barriers
Naches River Water Treatment Plant Screen ProjectNaches River Water Treatment Plant Screen Project
The City’s WTP diversion was not addressed during Phase 1 of the BPA Screening
Wapatox had installed state of the art screens
Naches River Water Treatment Plant Screen ProjectNaches River Water Treatment Plant Screen Project
Bureau of Reclamation and PP&L started conservations about shutting down the Wapatox
Looked like the canal would be down during the winter monthsThe City would need fish screens as water would no longer be screened by Wapatox
Naches River Water Treatment Plant Screen ProjectNaches River Water Treatment Plant Screen Project
The City applied to BPA for fundsBPA grant for partial funding
The City applied to SRFB for fundingSRFB made small grant
Total Project cost $1,838,430$1,124,000 from BPA$300,000 from SRFB$414,430 from City funds
Naches River Water Treatment Plant Screen Project
Naches River Water Treatment Plant Screen Project
Main Structure built by a contractor Chuck Lenberg and crew built and installed the
screens and upstream barriers
BeforeBefore
ScreenScreen
ScreenScreen
ScreenScreen
Upstream Migrant BarrierUpstream Migrant Barrier
Automatic Air Burst Backwash
Automatic Air Burst Backwash
Automatic Air Burst Backwash
Automatic Air Burst Backwash
Level ControlLevel Control
IssuesIssues
Mud Behind ScreensLong way to run vacuum truck, but doable
Algal build up on screens in summerThought we could hand clean twice a year. Before Wapatox turns on and after they shut downThis year with the HOT we have had to hand clean about twice a month
– Takes about an hour
IssuesIssues
Slush Ice
Naches River Water Treatment Plant Screen
Project
Naches River Water Treatment Plant Screen
Project Why did the City install a Screen?
September 13, 2006David Brown
Water/Irrigation Division Manager
Tour this afternoon
Questions?