Client Program Success


Client Project A

Faced with mounting regulatory compliance orders, this City began an extensive overflow mitigation program to address rainfall dependent infiltration/inflow as well as hydraulic constrictions within their existing collection system. As part of those orders, an intermediate flow investigation was required at a specific milestone along the rehabilitation timeline. Interra Hydro was contracted to monitor and report on the intermediate changes in RDi/i contribution across the selected basin, representing the end of Phase One Rehabilitation efforts.

The segmented Scope of Work required the array of services provided by Interra Hydro's skilled field and technical personnel.

  • Temporary flow monitoring using area-velocity meters at eighteen (18) sites, including four (4) tipping bucket style rain gauges, conducted over a 180-day period to include both dry and wet weather patterns.
  • Five (5) permanent flow meters were installed at key sites throughout the City's interceptor collection system.
  • On-site training of City personnel included setup, operation, maintenance, and troubleshooting of the flow meters, rain gauges, software, and all ancillary equipment pertinent to flow monitoring and data acquisition.
  • The conversion of the City's Hydroworks hydraulic modeling software over to the more robust and graphically oriented Infoworks.

Sixteen (16) flow meters, capturing 60% of the City's nearly 2.3 million linear feet of collection system, were incorporated into the basin investigation with two (2) meter sites selected in neighboring basins for control sub-area comparison. Each flow monitor was verified, cleaned, and downloaded on a weekly basis to provide the City with the most reliable data possible.

Along with a hydraulic modeling software upgrade, the City's modeling staff requested a conversion of two (2) historical model files along with the inclusion/correction of updated rehabilitation information be amended to the model's network layout.

Throughout the project, the data---both raw and finished---was accessible to City personnel via a secure intranet site. This on-line storage and file transfer allowed for quicker information delivery and ensured that all parties were working from the latest version of data.

The flow monitoring data obtained from this intermediate investigation was incorporated into the model to provide the City with an up-to-date and dynamically editable version for future RDi/i reduction and collection system expansion evaluations.