An Innovative Approach for Increasing Lift Station Pumping Capacity Add photo here 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

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

Project Background

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

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

Service Area

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

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

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

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

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)

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

Low Altitude Photogrammetry using UAS

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-007.4-2002

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)

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

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

Flight Path

Statewide High Resolution Orthophoto

Statewide High Resolution Orthophoto

UAV Orthophoto

Point Cloud

UAV Orthophoto

Point Cloud

Shadows…

Cows

Questions? Wes Bramlett, PE Jeff Jones, PE HIGHFILL wbramlett@hiepc.com 336-701-2910 Jeff Jones, PE Salisbury-Rowan Utilities jjone@salisburync.gov 704-638-2146