Sample Answer
On a recent wastewater collection system rehab project for a city of about 85,000 people, I was the analyst responsible for QC on the modeling results and the basis-of-design report. We were sizing rehab and upsizing for roughly 40 miles of gravity sewer and 6 pump stations. My first step was a structured checklist: model build review, data sources, calibration benchmarks, and design criteria (peaking factors, I/I assumptions, freeboard). I spot-checked about 15% of pipes and all critical junctions by hand using Excel and Manning’s equation. During review, I noticed one sub-basin’s modeled peak flow was about 30% higher than historical SCADA and flow meter data. Instead of adjusting the model to fit, I traced the data back and found a GIS connectivity error and a double-counted pump station. After fixing it and re-running scenarios, projected surcharge locations dropped by about 20%. I documented all assumptions, checks, and corrections in a QC log that became part of the final report.
Keywords
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