SCBID TRAVELING WEED SCREEN PROGRAM ... A look at the weed problem...

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Transcript of SCBID TRAVELING WEED SCREEN PROGRAM ... A look at the weed problem...

  • SCBID TRAVELING WEED SCREEN PROGRAM Eric Dixon, P.E. Chief Engineer South Columbia Basin Irrigation District

  • OVERVIEW

    A look at the weed problem – Primarily in the context of pumping plants

    Some common approaches to handling weeds/debris

    SCBID traveling weed screen program Results

    **Primary focus is on techniques/methods used by SCBID

  • THE PROBLEM…

    Weeds, more weeds, and some other stuff – Weeds: aquatic, terrestrial – Other stuff: crops, garbage, general debris

  • THE PROBLEM CONT.

  • THE PROBLEM CONT.

    Sometimes the Debris is really big!!

    Public Safety Announcement: Don’t text will tractoring…

  • THE PROBLEM CONT.

    So what happens??? – Intake racks blocked – pumps shut down

    • Service interruptions • Canal/Ditch fluctuations upstream and downstream • Racks must be cleaned & pumps restarted

  • SCREENING/HANDLING

    Two approaches (not going to talk about weed treatment/prevention programs) – Manual Labor – Mechanical

  • SCREENING/HANDLING CONT.

    Manual Labor – Use of rakes/hand tools by employees – Labor intensive/time consuming – After hours call-outs and overtime – Safety hazards

    • Night work near water • Physical strain

  • SCREENING/HANDLING CONT.

    Mechanical – Various methods

    • Automated rakers (various types) • Rotating drum screens • Passive screens • Traveling screens • Use of heavy equipment: excavators, etc.

    – All three Districts in CBP using some or all of these mechanical methods.

  • SCREENING/HANDLING CONT.

    Mechanical – Automated Raker

  • SCREENING/HANDLING CONT.

    Traveling Screens – Simple design

    concept – Typical installations

    • Move material in a downstream direction

    • Require structural work in channel

    • Require space downstream for material deposit

  • SCREENING/HANDLING CONT.

    Traveling Screens Cont.

  • SCBID TRAVELING SCREEN PROGRAM

    We are a little backwards down South – Standard traveling screen concept but run

    them against the flow

  • SCBID TRAVELING SCREEN PROGRAM

    Why??? – No structural work required in the channel

    with one exception – Minimal modifications required to pumping

    plant structure – Material is deposited upstream away from the

    pumping plant for better access/cleanliness – Some redundancy is maintained with

    remaining bar racks

  • SCBID TRAVELING SCREEN PROGRAM

    The Prototype – Constructed in-house winter 2015 – 28 CFS (12,600 GPM) pumping plant

  • SCBID TRAVELING SCREEN PROGRAM The Basics

    – Box sits on P.P. apron – screen sits on box – Existing bar rack removed at box outlet – Flow over screen through box

  • SCBID TRAVELING SCREEN PROGRAM The Basics Cont.

    – Epoxy coated frame and box – Polymer screen material – No moving parts under water – Small ½ HP drive motor with timer/manual

    control

  • SCBID TRAVELING SCREEN PROGRAM

    Results – Very quick in-field installation time – Extremely reliable – Little to no maintenance – No fouling of polymer screen material

    • Spray bars not required – No pumping plant failures due to

    weeds/debris

  • SCBID TRAVELING SCREEN PROGRAM

    Results Cont. – Example: 2019

    Installation • EB1 PP: 75 CFS

    (33,700 GPM) • Typically offline

    20-25 times due to weeds/debris

    • This year no plant failures due to weeds/debris

  • CONCLUSION

    SCBID on 5th year of program – Exceeded expectations – In-house construction allows us to: control costs,

    implement unique configurations Weed/debris handling remains a continual

    problem for all CBP Districts. Various Methods, One Goal:

    – Deliver water to our landowners • Safely • Reliably • Efficiently

  • ANY QUESTIONS?

    Eric Dixon, P.E. Chief Engineer South Columbia Basin Irrigation District

    Edixon@scbid.org 509-547-1735

    mailto:Edixon@scbid.org

    Slide Number 1 OVERVIEW THE PROBLEM… THE PROBLEM CONT. THE PROBLEM CONT. THE PROBLEM CONT. SCREENING/HANDLING SCREENING/HANDLING CONT. SCREENING/HANDLING CONT. SCREENING/HANDLING CONT. SCREENING/HANDLING CONT. SCREENING/HANDLING CONT. SCBID TRAVELING SCREEN PROGRAM SCBID TRAVELING SCREEN PROGRAM SCBID TRAVELING SCREEN PROGRAM SCBID TRAVELING SCREEN PROGRAM SCBID TRAVELING SCREEN PROGRAM SCBID TRAVELING SCREEN PROGRAM SCBID TRAVELING SCREEN PROGRAM CONCLUSION ANY QUESTIONS?