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 […]
FAQs
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A double mass analysis is one method to compare cumulative rainfall from various rain gauges where consistency between rain gauges is deemed an indicator of proper operation. Keep in mind […]
Most I/I studies look to quantify rainfall entering a sewer system as I/I. As a result, frozen precipitation events that occur during an I/I study are often ignored. Keep in […]
The primary, independent recommendation for rain gauge density in the United States is from the American Society of Civil Engineers (ASCE) and the Water Environment Federation (WEF). They recommend a […]
When determining sewer basin and sub-basin areas for an I/I analysis, do you typically use the entire acreage of the sub-basin, or do you subtract out undeveloped areas, native growth […]
The ADS ECHO can help you judge the timing of I/I by observing the quickness of the flow response and the rate at which the system recovers. ECHOs can also […]