• Brief, infrequent wet-weather events may be allowed to approach d/D ≈ 1.0, but many guidelines still recommend that even wet-weather d/D not routinely exceed 1.0.• Existing systems with high […]
FAQ Category: A Look at the Basics
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• High d/D values indicate low residual capacity; agencies flag pipes with high d/D and low reserve capacity for further evaluation or upgrades.• Sustained high d/D (near or above 1.0) […]
• In circular pipes, velocity at partial flow can exceed the full-flow velocity, with maximum velocity typically occurring around d/D ≈ 0.8.• Discharge is not maximized at exactly full flow; […]
• Many design standards limit dry-weather d/D to about 0.5 for small sewers (≤ 15 in) and 0.75 for larger sewers to ensure reserve capacity and ventilation.• Peak or wet-weather […]
Asset criticality reflects how important an asset is to system performance, safety, and compliance, often driving which locations receive more monitoring, inspection, and rehabilitation.