Flow Monitoring

Flow Monitoring

Benefit from Duke’s Experienced Teams and Modern Equipment

At Duke’s, we maintain a full-time crew dedicated to open channel flow metering using our cutting-edge company-owned equipment and software utilities. With extensive experience monitoring rainfall and flow levels in a wide variety of wastewater and stormwater collection systems, we are your ideal source for accurate data and custom-targeted solutions.

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Delivering Versatility that Yields Accurate Results

We take pride in delivering the in-house knowledge, experience, and equipment necessary to yield accurate, actionable flow-monitoring results regardless of the scope of our clients’ needs. Our company-owned flow-monitoring equipment includes Marsh McBirney FloDar, American Sigma 910-950, and ADS FlowSarks, which enable us to provide the best data possible to our clients, even in challenging conditions.

Our equipment includes:

  • Twenty-five (25) Hach FL-900 flow loggers w/submersible A/V sensors and cellular modems for remote communication
  • Nine (9) Sigma 910 flow loggers w/submersible A/V sensors (including a wide variety of stainless steel mounting bands & hardware)
  • Five (5) Isco tipping-bucket rain gauges
  • Four (4) Hach DDS Logger Flow Meters
  • Five (5) AV Sensors
  • Thirteen (13) HOBO Rain Gauges
  • Six (6) full confined space entry sets including tripods, ventilators, & multi-gas detectors
  • One (1) Phaser V1000 hand-held radar surface velocity meter
  • Two (2) Yamaha Rhino 4×4 all-terrain vehicles
  • One (1) Flowmate 2000 Portable Velocity Meter


Examples of Our Extensive Flow-Monitoring Experience

  • Govalle/Union Creek, Austin, TX: 23 Flow Meters
  • Crooked Creek, Union County, NC: 67 Flow Meters
  • Northeast WFR, St. Petersburg, FL: 38 Flow Meters
  • Cross/Rockfish Creeks, Fayetteville, NC: 45 Flow Meters
  • Mid-Atlantic States WRF, St. Petersburg, FL: 36 Flow Meters
  • HRDS Consent Order, Hampton Roads, VA: 34 Flow Meters
  • Rocky Branch/Saluda Creek, Columbia, SC: 30 Flow Meters

Stemmers Run SRRRP, Baltimore County, MD: 5 Flow Meters

Featured Project Details:


Raleigh, North Carolina, City of Raleigh Public Utilities Department (CORPUD)

SERVICES: Manhole Inspections • Video Survey & Evaluation • Off-Road Sewer CCTV Inspections • Rehabilitation/Repair Recommendations • Capital Improvements Project Planning

WORK PERFORMED: 2010 – 2013


Evaluation of the gravity sewers located adjacent to sewer siphons throughout the City’s sewer collection and transmission system. The intent of the project was to identify the extent of hydrogen sulfide gas damage in the concrete sewer mains and precast manholes upstream and downstream of the siphon locations. Turbulence at both the upstream and downstream siphon manholes create conditions for release of hydrogen sulfide gas, well known as a corrosive agent that relentlessly attacks concrete and steel reinforcing. The project was initiated after several failures occurred and is the first phase of an overall project which will include inspection of the connecting siphons using multi-sensor inspection technologies. Our crews video inspected approximately 29,600 LF of large diameter reinforced concrete sewer mains ranging in size from 30” – 72” and approx. 116 manholes and siphon structures. Additionally, the project identified approximately 19,500 LF of corrosion ranging from moderate to severe.


The sewers in this project were located in extremely wet, off-road, environmentally sensitive areas which required the use of specialized equipment including all-terrain CCTV inspection vehicles. Video inspection of the large diameter mains required use of our in-house fabricated pontoon float used as a camera skid. The pontoon floated the camera downstream while being carefully guided with a series of cables.


The final phase of the project included performing condition assessments on all sewer mains and manholes, developing detailed rehabilitation and repair recommendations to correct defects resulting from hydrogen sulfide gas damage, preparing cost estimates for all recommendations and prioritizing repairs based on the severity of the damage observed. Evaluation results were used to develop project descriptions for inclusion in the City’s Capital Improvement Plan.

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