Verification of a Combined Sewer Model for Urban Drain Improvement
Model verification for a large combined sewer system can be expensive and time- consuming. Frequently, a governmental entity cannot afford to expand their flow meter network throughout an entire sewer system to obtain sufficient data for model verification. In an attempt to limit the costs related to the verification process, other avenues using available data were explored, while still maintaining a high level of reliability.
The objective of this chapter is to document two techniques used to verify a large combined sewer system modeled in Oakland County, Michigan. Initially, an area representing approximately 10% of the district modeled was verified with flow metering data. Secondly, to avoid the cost of installing additional meters in large diameter sewers, the overall model was verified by comparing modeled hydraulic grade lines with reported basement flooding elevations and measured high water marks.
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