Experimental Study of Hydraulics of Drill-Drop Manholes
Bibliographic record
Abstract
The results of an experimental study of a drill-drop manhole used in the City of Edmonton, Alberta, Canada, are presented. A drill-drop manhole is a vertical drop manhole connected to a deep trunk sewer with an upper manhole and a lower manhole. The upper manhole diameter is only two or three times that of the lower manhole. Further, the flow in the upper manhole is dominated by the momentum of the incoming flow and as a result, the weir and orifice outflow types occurring in a relatively larger upper reservoir do not occur in drill-drop manholes. Instead, four regimes were discovered: deflected jet, stable pool, filling and emptying, and full pipe flow regimes. Dimensionless head-discharge curves were developed for the upper manhole for all flow regimes, and an expression for the sum of the losses in the upper manhole, including the entrance loss to the outlet pipe was found from the experimental results. Effects of outlet diameter and its length, inlet diameters, and their elevations were studied.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".