What is sewer flow monitoring?

Sewer flow monitoring is the continuous measurement of wastewater velocity, depth, and flow rate inside active sewer manholes using area-velocity sensors and cellular telemetry.

What is a sewer capacity study?

A sewer capacity study measures existing flow conditions in a downstream sewer to confirm adequate hydraulic capacity for proposed development. Municipalities require a PE-stamped certification and LVL I & II inspection support letter before issuing building permits.

How long does sewer flow monitoring take?

Capacity studies: 7-14 days. I/I and RDII studies: 30-56 days. Model calibration: 3-6 months. US3 delivers proposals within approximately 24 hours.

Rainfall Dependent Infiltration and Inflow is stormwater entering the sanitary sewer during rain events. It is the primary cause of wet weather sanitary sewer overflows. US3 quantifies RDII using the EPA RTK unit hydrograph method.

Capacity Management Operations and Maintenance is EPA's framework for managing sanitary sewer collection systems. US3 provides the flow monitoring data that forms the evidentiary foundation of CMOM programs.

What states does US3 operate in?

US3 operates in all 50 states with additional coverage in Canada, Mexico, and Puerto Rico. Call (855) 872-8233.

Sewer Flow Monitoring & Engineering Services

All Clients

Sewer Flow Monitoring

Continuous measurement of wastewater flow rate, velocity, and depth. Cellular telemetry with near real time uploads. 95%+ data uptime target.

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Civil Firms & Developers

Sewer Capacity Studies

PE-stamped certification and LVL I & II inspection support for building permits, sewer connection agreements, and development entitlements. Most studies complete in 7–14 days.

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Municipalities & Utilities

RDII Analysis

RTK unit hydrograph method. Supports CMOM programs, EPA consent decree compliance, SSO reduction, and CIP prioritization.

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Hydraulic Modeling Engineers

Hydraulic Model Calibration

15-minute DWF diurnal datasets for EPA SWMM, InfoWorks ICM, SewerGEMS, XPSWMM, and ESRI. Ready for direct import.

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Field Services

Flow Meter Installation

Professional area-velocity sensor installation per OSHA confined-space protocols. Site photos and velocity profile verification included.

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Municipalities

CMOM Program Support

Long-term monitoring for EPA consent decree milestones, CMOM capacity assessments, and sanitary sewer evaluation surveys (SSES).

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Products

Flow Monitoring Equipment

Explore US3 flow monitoring equipment designed for sewer and open-channel applications.

Monitoring Equipment

FlexFlow IQ

Non-contact radar velocity and depth sensing for sewer and open-channel flow monitoring, with wireless and wired connectivity options.

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Our Services

Sewer Flow Monitoring

Sewer Capacity Studies

RDII Analysis

Hydraulic Model Calibration

Flow Meter Installation

CMOM Program Support

Flow Monitoring Equipment

FlexFlow IQ

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