How a city finds a hidden water leak
A hidden water-main leak is found by narrowing the question: audit the missing water, meter a district, listen along a likely pipe, and test the answer in the field.
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The sewer beneath a rainy street
A curb inlet hides a consequential choice: runoff may enter a storm sewer bound for a waterway or join household wastewater in a combined pipe. Rainfall, pipe capacity, and the controls built around them decide what happens next.