Abstract

Hydraulic models of sewer systems require accurate flow monitoring data. Without accurate data, models of combined sewer and separated sewer areas are unreliable. How can a project manager far removed from decisions made in the field be assured that the flow data not only represent adequate coverage of the system, but also are reliable for calibration of the model?

This chapter reviews the first step in the flow monitoring program developed for the Cincinnati System Wide Model, namely site selection. Site selection involves three components; modeling objectives, data quality, and site conditions. How any given manhole satisfies these three components is determined using both GIS and field inspections. GIS mapping provides most of the information necessary to determine which manholes satisfy modeling objectives. Conversely, field inspection of candidate manholes is necessary to assess the site conditions, which affect the data collection costs. Recognizing that these three components are each important and often competing provides a basis for developing an efficient flow monitoring program to support the modeling. The application of these site selection components is highlighted by a large modeling project in Cincinnati.

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