Frequently Asked Questions
Common questions about sewer flow monitoring, capacity studies, and RDII analysis.
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. Read our complete guide.
A sewer capacity study measures existing flow conditions to confirm adequate hydraulic capacity for proposed development. Municipalities require PE-stamped certification and LVL I & II inspection support before issuing building permits. Learn how capacity studies work.
Capacity studies: 7–14 days. I/I and RDII studies: 30–56 days. Hydraulic model calibration: 3–6 months. Consent decree programs: 12–18 months. US3 delivers proposals within approximately 24 hours.
RDII is stormwater entering the sanitary sewer during rain events — the primary cause of wet weather SSOs. US3 quantifies it using the EPA RTK method. Read our complete RDII guide.
Capacity Management Operations and Maintenance is EPA's framework for managing sanitary sewer systems. US3 provides the flow monitoring data that forms the evidentiary foundation of CMOM programs. Learn about our CMOM support.
Yes. All US3 datasets are formatted for direct import into EPA SWMM, InfoWorks ICM, SewerGEMS, XPSWMM, and ESRI — including 15-minute DWF diurnal patterns, peaking factors, and RTK-calibrated RDII parameters.
US3 operates in all 50 states with additional coverage in Canada, Mexico, and Puerto Rico. Call (855) 872-8233 to confirm availability.
Flow meters are installed in active sewer manholes following OSHA 29 CFR 1910.146 confined-space protocols. Read our installation guide.
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