# Presentation: 351546

## Fish Screen Cleaning Using Underwater, Stationary Nozzles  A Case Study......

- Michael Lambert, Fish Passage Engineer,
- Oregon Department of Fish and Wildlife
- John Dummer, Project Engineer,
- Black & Veatch Portland, Oregon
- Gary Myzak, Project Manager
- City of Salem, Oregon

## Today’s Presentation

- Site used for case study
- Variables associated with underwater cleaning system
- Nozzles in use and available
- Approach to testing nozzles
- Data from nozzle testing
- Insights gained from data gathered
- Questions

## Site used for case study
Mill Race Fish Screen, Salem, Oregon
Purpose:
Aesthetics
Historic hydro facility
Flow through screen ~ 25 to 30 cfs 
10 bays with vertical screens
Each screen 4’ wide x 5.25’ tall
Hendrick profile bar screen
Cleaning system
Nozzle manifold controlled by solenoid valves
15 Hp pump

- Mill Race Fish Screen, Salem, Oregon
- Purpose:
- Aesthetics
- Historic hydro facility
- Flow through screen ~ 25 to 30 cfs
- 10 bays with vertical screens
- Each screen 4’ wide x 5.25’ tall
- Hendrick profile bar screen
- Cleaning system
- Nozzle manifold controlled by solenoid valves
- 15 Hp pump

## Nozzle Manifold Array

## Variables associated with underwater cleaning system
Pressure
Area
Velocity
Distance from screen
Nozzles 

- Pressure
- Area
- Velocity
- Distance from screen
- Nozzles

## Nozzles in use and available
Nozzles in use
Eductor nozzles
~ 11 inches from screen
Other Nozzles available
Solid spray nozzles
Spiral nozzles

- Nozzles in use
- Eductor nozzles
- ~ 11 inches from screen
- Other Nozzles available
- Solid spray nozzles
- Spiral nozzles

## Approach to testing nozzles
Consistent Approach for Evaluation
Pressure gauge
Flutter Frame
Introduction of Common Media
Grass Clippings
Underwater Video Camera
Nozzles/Nozzle Configurations 
No Nozzle
Eductor
Solid Spray, with and without straightener
Solid Spray with fan
Spiral 
Modify distance from screen

- Consistent Approach for Evaluation
- Pressure gauge
- Flutter Frame
- Introduction of Common Media
- Grass Clippings
- Underwater Video Camera
- Nozzles/Nozzle Configurations
- No Nozzle
- Eductor
- Solid Spray, with and without straightener
- Solid Spray with fan
- Spiral
- Modify distance from screen

## all ports open, no nozzles

- spiral nozzle showing spray pattern in air

- Solid Spray w/ flow straightener, H1/4U-0070

- Solid Spray w/ flow straightener, H1/4U-0070

## Data from nozzle testing
Area cleaned by existing nozzles ~ 4 to 6 inches in diameter
Spiral nozzle
10-inch width of flutter
Weak force
15 degree spray angle w/stabilizer 
6 inch wide by 10 inches high flutter area
Strong force
Moving eductor nozzle further from screen
Did not provide consistent increase in area cleaned
Difficult to evaluate due to piping

- Area cleaned by existing nozzles ~ 4 to 6 inches in diameter
- Spiral nozzle
- 10-inch width of flutter
- Weak force
- 15 degree spray angle w/stabilizer
- 6 inch wide by 10 inches high flutter area
- Strong force
- Moving eductor nozzle further from screen
- Did not provide consistent increase in area cleaned
- Difficult to evaluate due to piping

## Screen Coverage

## Screen Coverage

## Insights gained from data gathered
Little data available describing submerged nozzles
Nozzles designed to spray into atmosphere 
Difficult to quantify performance of submerged nozzles 
Submerged nozzle effectiveness depends on several variables
Of the nozzles and nozzle configurations tested none were found to be definitively superior to the eductors

- Little data available describing submerged nozzles
- Nozzles designed to spray into atmosphere
- Difficult to quantify performance of submerged nozzles
- Submerged nozzle effectiveness depends on several variables
- Of the nozzles and nozzle configurations tested none were found to be definitively superior to the eductors

## Thanks

- Cooperative Effort
- Special Thanks to the City of Salem
- Gary Myzak, Senior Project Manager
- Brandon Clarke and Angel Garcia, City Maintenance Staff

## 
Questions

- Questions