Sewer Monitoring Series · Water Environment Federation · 2025
Building a Sewer Flow Monitoring Practice
From $890K Engagement to $4.1M Follow-On Work
“The monitoring program was the engagement. The follow-on work was the business model.”
Civil engineering firms build profitable monitoring practices by treating monitoring as a core technical competency. The firm that collects, analyzes, and explains the monitoring data owns the analytical narrative and becomes the most credible author of downstream capital improvement recommendations.
Abstract
This case study documents how a 47-person regional civil engineering firm built an in-house sewer flow monitoring practice over 18 months and used that capability to create a durable consulting advantage.
Three initial monitoring contracts totaling $890,000 generated $4.1 million in follow-on design and construction administration work. The practice required about $375,000 in investment and achieved a 10.6x return within 36 months.
Background
Many engineering firms historically subcontract flow monitoring because it appears to be a specialized field task. That approach reduces upfront investment, but it can also give away the deepest technical understanding of the client’s system.
The strategic insight in the whitepaper is that the analyst becomes the trusted advisor. The team that characterizes RDII, calibrates the model, and explains system behavior is naturally positioned to recommend and design the resulting improvements.
Methodology
The practice build-out included equipment inventory, technical training, a cloud-based software platform, and a repeatable QA/QC and reporting protocol. The goal was not only to collect data, but to create a defensible methodology clients could trust.
The standardized workflow covered data cleaning, dry-weather characterization, event selection, RTK estimation, RDII density mapping, and reporting. That repeatable approach made monitoring results easier to turn into engineering recommendations.
Results
The firm’s initial monitoring contracts led directly to follow-on design work because each program produced specific findings: illegal cross-connections, SSO volume correction, wet-weather pump station complaints, and rehabilitation priorities.
The whitepaper also shows why equipment ownership can become economically superior to rental when annual deployment exceeds roughly 200 meter-months. With concurrent clients, the practice exceeded break-even utilization quickly.
Engineering Significance
Monitoring creates incumbency. Once a firm owns the data narrative, competitors cannot easily replicate the same knowledge without conducting their own monitoring campaign.
For civil engineering firms, sewer flow monitoring should be viewed as a strategic capability, not a commodity service. It creates technical authority, client confidence, and a clearer path to design-phase work.
Conclusion & Next Steps
Engineering firms should evaluate sewer monitoring as a business development tool that produces the data behind future engineering decisions. The downloadable PDF includes the full formatted whitepaper for internal planning, client education, and practice development.