FAQ Category: Inflow and Infiltration

The answer depends on the type of sewer. For storm sewers, specified rainfall return frequencies are used to provide various levels of service and are often specified in local storm […]

Think of the minimum Rainfall Threshold as a default value to automatically identify rainfall events, not as an ideal value. As a rule-of-thumb, we often do not evaluate a rainfall […]

The National Oceanic and Atmospheric Administration (NOAA) and USGS both maintain networks of rain gauges across the United States, and data from them are available for public use. Our recommendation […]

We call this situation a flow imbalance, and this is indeed a problem. This first thing to do is evaluate the data from each flow monitor. Were both monitors installed […]

Yes. ADS flow monitoring services, including data approval in PRISM, are governed by written procedures that are part of our quality assurance and quality control program which is certified under […]

Nighttime flow isolations can be effective in the extreme upper reaches of the sewer system. However, the most useful nighttime flow isolations are the ones where no flow is observed, […]