{
  "id": "ark:/99999/dp-american-rivers-dam-removal-database.v1",
  "concept": "ark:/99999/dp-american-rivers-dam-removal-database",
  "type": "datasetpaper",
  "title": "Do dam structural dimensions predict upstream river miles reconnected?",
  "discipline": "Environmental science / river restoration",
  "description": "Using the American Rivers Dam Removal Database (2,325 removed dams), we asked whether two structural dimensions of a removed dam — its height and its leng…",
  "url": "https://datasetpapers.com/papers/dam-size-vs-upstream-miles-reconnected/",
  "status": "gated",
  "trust_distance": 0,
  "gate": {
    "passed": true,
    "version": "gate-0.1",
    "novelty_grade": "C",
    "failed": []
  },
  "verification": {
    "claims": 5,
    "self_reported_re_executed": 0,
    "independent_reexecution": {
      "status": "matched",
      "reproduced": true,
      "method": "re_execution",
      "ran_at": "2026-07-13T14:07:37Z",
      "values_compared": 57,
      "numeric_mismatches": 0,
      "record": "verification.json"
    }
  },
  "byline": {
    "software_agent": {
      "name": "Claude Opus 4.8",
      "model_id": "claude-opus-4-8"
    },
    "data_creators": [
      "American Rivers"
    ],
    "data_creator_orcids": {},
    "question_asker": "Mark Hahnel"
  },
  "source_dataset": {
    "title": "American Rivers Dam Removal Database",
    "doi": "10.6084/m9.figshare.5234068.v13",
    "license": "CC BY 4.0",
    "landing_url": "https://doi.org/10.6084/m9.figshare.5234068.v13",
    "download_url": "https://ndownloader.figshare.com/files/62712199"
  },
  "components": [
    {
      "name": "analysis",
      "type": "code",
      "path": "analysis.py",
      "ark": "ark:/99999/dp-american-rivers-dam-removal-database.v1/analysis",
      "produced_by": null
    },
    {
      "name": "fig-1",
      "type": "figure",
      "path": "figures/fig-1-height-vs-miles.png",
      "ark": "ark:/99999/dp-american-rivers-dam-removal-database.v1/fig-1",
      "produced_by": null
    },
    {
      "name": "fig-2",
      "type": "figure",
      "path": "figures/fig-2-length-vs-miles.png",
      "ark": "ark:/99999/dp-american-rivers-dam-removal-database.v1/fig-2",
      "produced_by": null
    },
    {
      "name": "fig-3",
      "type": "figure",
      "path": "figures/fig-3-robustness.png",
      "ark": "ark:/99999/dp-american-rivers-dam-removal-database.v1/fig-3",
      "produced_by": null
    },
    {
      "name": "tbl-1",
      "type": "table",
      "path": "tables/tbl-1-primary-correlations.csv",
      "ark": "ark:/99999/dp-american-rivers-dam-removal-database.v1/tbl-1",
      "produced_by": null
    },
    {
      "name": "tbl-2",
      "type": "table",
      "path": "tables/tbl-2-robustness.csv",
      "ark": "ark:/99999/dp-american-rivers-dam-removal-database.v1/tbl-2",
      "produced_by": null
    },
    {
      "name": "tbl-3",
      "type": "table",
      "path": "tables/tbl-3-variable-summary.csv",
      "ark": "ark:/99999/dp-american-rivers-dam-removal-database.v1/tbl-3",
      "produced_by": null
    },
    {
      "name": "narrative",
      "type": "narrative",
      "path": "narrative.md",
      "ark": "ark:/99999/dp-american-rivers-dam-removal-database.v1/narrative",
      "produced_by": null
    }
  ],
  "claims": [
    {
      "n": 1,
      "subject": "Dam height (Dam_Height_ft) of removed dams",
      "predicate": "is not associated with",
      "object": "upstream river miles reconnected (Miles_Restored_US)",
      "assertion_text": "Dam height shows no detectable monotonic association with upstream miles reconnected (Spearman rho = 0.047, raw p = 0.34, Holm-corrected p = 0.34, 95% bootstrap CI [-0.052, 0.145], n = 420); the confidence interval includes zero.",
      "supported_by": [
        "fig-1",
        "tbl-1",
        "analysis"
      ],
      "confidence": 0.85,
      "novelty_grade": "C",
      "mode": "observational-correlational",
      "verification_status": "unverified",
      "ark": "ark:/99999/dp-american-rivers-dam-removal-database.v1/claim-1"
    },
    {
      "n": 2,
      "subject": "Dam length (Dam_Length_ft) of removed dams",
      "predicate": "is weakly positively associated with",
      "object": "upstream river miles reconnected (Miles_Restored_US)",
      "assertion_text": "Dam length is weakly positively associated with upstream miles reconnected (Spearman rho = 0.129, raw p = 0.0092, Holm-corrected p = 0.018, 95% bootstrap CI [0.032, 0.226], n = 404); the association survives Holm-Bonferroni correction across the two primary tests.",
      "supported_by": [
        "fig-2",
        "tbl-1",
        "analysis"
      ],
      "confidence": 0.75,
      "novelty_grade": "C",
      "mode": "observational-correlational",
      "verification_status": "unverified",
      "ark": "ark:/99999/dp-american-rivers-dam-removal-database.v1/claim-2"
    },
    {
      "n": 3,
      "subject": "The marginal dam-height association with upstream miles reconnected",
      "predicate": "is attributable to",
      "object": "collinearity between dam height and dam length",
      "assertion_text": "In a rank-based partial correlation on the common subset (n = 400), the length-reconnection association holds controlling for height (partial rho = 0.121, p = 0.015), whereas the height-reconnection association vanishes controlling for length (partial rho = -0.028, p = 0.578).",
      "supported_by": [
        "fig-3",
        "tbl-2",
        "analysis"
      ],
      "confidence": 0.7,
      "novelty_grade": "C",
      "mode": "observational-correlational",
      "verification_status": "unverified",
      "ark": "ark:/99999/dp-american-rivers-dam-removal-database.v1/claim-3"
    },
    {
      "n": 4,
      "subject": "The dam-length association with upstream miles reconnected",
      "predicate": "is robust to",
      "object": "outlier winsorization of the outcome at its 99th percentile",
      "assertion_text": "Winsorizing Miles_Restored_US at its 99th percentile (cap = 614.45 miles) leaves both primary coefficients essentially unchanged (length rho = 0.129, p = 0.0092; height rho = 0.047, p = 0.34), so neither result is driven by extreme reconnection values.",
      "supported_by": [
        "fig-3",
        "tbl-2",
        "analysis"
      ],
      "confidence": 0.8,
      "novelty_grade": "C",
      "mode": "observational-correlational",
      "verification_status": "unverified",
      "ark": "ark:/99999/dp-american-rivers-dam-removal-database.v1/claim-4"
    },
    {
      "n": 5,
      "subject": "Dam structural size (height and length)",
      "predicate": "explains a negligible fraction of variance in",
      "object": "upstream river miles reconnected",
      "assertion_text": "The strongest observed association (length, Spearman rho = 0.129) corresponds to under 2% of rank variance in upstream miles reconnected (rho-squared = 0.0167), indicating dam physical scale is a minor determinant of how much upstream river a removal reconnects; no causal claim is made.",
      "supported_by": [
        "fig-3",
        "tbl-1",
        "narrative"
      ],
      "confidence": 0.7,
      "novelty_grade": "C",
      "mode": "observational-correlational",
      "verification_status": "unverified",
      "ark": "ark:/99999/dp-american-rivers-dam-removal-database.v1/claim-5"
    }
  ],
  "exports": {
    "object_json": "object.json",
    "claims_json": "claims.json",
    "ro_crate": "ro-crate-metadata.json",
    "verification": "verification.json",
    "code": "analysis.py",
    "emissions": [
      {
        "file": "datapackage.json"
      }
    ]
  }
}