Sources of Uncertainty in Canadian Low Flow Hydrometric Data
Bibliographic record
Abstract
The uncertainty of estimated daily mean discharge is 5% at the 95% confidence interval (Herschy, 1999a). The use of this unique value requires acceptance of the assumption of uniformity of uncertainty within the hydrometric dataset. It is the implicit responsibility of each researcher to challenge this assumption with respect to any given hypothesis test. This paper evaluates this assumption of uniformity for a subset of the hydrometric dataset-low flow in Canada. Studies of low flow phenomena are becoming more prevalent with increasing recognition of the importance of low flows for viable ecosystems and sustainable economies and as a sentinel of change. Environmental and operational circumstances are identified that elevate the opportunity for error with respect to measurement of low flows. These factors are examined qualitatively and are found to exist throughout all steps of the data production process. The uncertainty of low flows in Canada is very likely different from the uncertainty of the global hydrometric dataset. The magnitude of low flow uncertainty remains undefined because no field experiments were conducted as part of this study. It is hoped that these findings will inspire the design of future research needed to overcome this deficiency.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.016 | 0.097 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.007 | 0.015 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.005 | 0.001 |
| Open science | 0.002 | 0.003 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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".