1. An Innovative Approach for Increasing Lift Station Pumping Capacity
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An Innovative Approach for Increasing Lift Station Pumping Capacity
Presented by: Wes Bramlett, PE, HIGHFILL
Jeff Jones, PE, Salisbury-Rowan Utilities
NC AWWA-WEA 2018 Spring Symposium | March 26, 2018

2. Presentation Outline Project Background Lift Station Upgrade
Low Altitude Photogrammetry using UAS

3. Project Background

4. Existing Lift Station
Triplex station with space and piping for a forth pump
Three 1,400 GPM submersible pumps with 100 HP motors
Firm capacity = 3.17 MGD
Adjacent valve vault
Stand-by generator (can run two of the three pumps)
Existing 10-inch force main

6. Existing Lift Station Receives Wastewater From:
A large service area south of I-85
The communities of Granite Quarry, Rockwell, and Faith.
Transfers wastewater to a 42-inch interceptor for conveyance to the Grant Creek WWTP

7. Service Area

8. Reasons for Lift Station Upgrade
Expand capacity to serve growth in communities and areas south of I-85
Pump No. 2 experiences significant cavitation
Over 300 start/stop cycles per day
Limited station redundancy
Limitations of existing 10-inch force main
Unable to fully utilize available pumping capacity

9. SRU Design Criteria Increase overall station capacity
Limited to no wet well expansion
Complete operational redundancy of LS and FM
By-pass pumping capabilities
Incorporate a wastewater screen

10. Evaluation of Alternatives
HIGHFILL performed an alternatives evaluation to:
Develop station design capacity
Plan to expand the lift station

11. Proposed Expansion The proposed expansion includes:
Reconfigure the existing station to operate as two duplex stations
Each pair of pumps consists of 800 GPM & 1,400 GPM
Utilizes existing wet well
Reconfigure existing 24-inch influent sewer to prevent pump cavitation
Install a parallel 10-inch force main to increase system redundancy

13. Duplex Pumping System Operation
Each pair of pumps consists of 800 GPM and 1,400 GPM pumps.
800 GPM pump will normally operate (about ADF)
LAG pump on = second 800 GPM pump (Total Q = 1,600 GPM)
If flows increase, one 800 GPM drops out and 1,400 GPM starts (Firm Capacity = 2,200 GPM)
Ultimately, two 1,400 GPM pumps will operate (Maximum Capacity = 2,800 GPM)

16. Advantages Operational redundancy (pumps and FM)
Reduced station cycle times
Utilizes existing 1,400 GPM pumps
Increases pumping capacity with no net increase in total station HP
No generator upgrade required
New firm capacity of 4.0 MGD vs existing capacity of 3.17 MGD

17. Low Altitude Photogrammetry using UAS

18. Survey Accuracy for Design
Feature Location
H – 0.05 to 0.2 ft
V – 0.1 to 0.3 ft
Contours - 1 ft
Federal Geographic Data Committee
FGDC-STD

19. Enter the UAV Project is a good fit for low altitude photogrammetry
Size (approximately 9 acres)
Scope (topography and feature collection)
Location (away from the city and airport)

20. Equipment DJI Matrice 100 Airframe Zenmuse X5 Camera 4 rotor
Approx 20 min flight time
Approx 8 lbs maximum weight
Zenmuse X5 Camera
16 MP (4,608 x 3,456)
15 mm lens - 72° field of view

21. Flight Plan End Lap/Side Lap = 80% Flight Level ≈ 150 ft
Ground Sample Distance ≈ 1.15 cm
Images = 458
Flight Time ≈ 1 hr
Ground Control Points = 9

22. Flight Path

23. Statewide High Resolution Orthophoto

24. Statewide High Resolution Orthophoto

25. UAV Orthophoto

26. Point Cloud

27. UAV Orthophoto

28. Point Cloud

31. Shadows…

32. Cows

33. Questions? Wes Bramlett, PE Jeff Jones, PE HIGHFILL
Jeff Jones, PE
Salisbury-Rowan Utilities