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<p><b>New page</b></p><div><!-- PAGE METADATA<br />
page_type: tool_or_platform<br />
page_id: TOOL_PFHA<br />
canonical_hazard_id: N/A<br />
related_hazard_ids: EH-HYD, EH-HYD-RIV, EH-HYD-PLV<br />
authoritative: true<br />
revision_date: 2026-05-07<br />
status: placeholder_v1.0<br />
summary: Stochastic event-based modeling tools (SEFM and RORB_MC) used to perform probabilistic flood hazard assessments for riverine and pluvial flooding at nuclear power plant sites.<br />
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<span style="background:#5A9E6F; padding:3px 14px; border-radius:12px; font-size:80%; font-weight:bold; letter-spacing:1px;">[[Methods_and_Tools|<span style="color:#FFF;">TOOL / PLATFORM</span>]]</span><br />
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'''PFHA Tools — Stochastic Event Flood Models (SEFM / RORB_MC)'''<br />
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The Stochastic Event Flood Model and the Stochastic Runoff Routing Monte Carlo model are stochastic event-based simulation platforms used to develop probabilistic flood hazard assessments for nuclear power plant sites. These tools move beyond the traditional Probable Maximum Flood paradigm by estimating the full probability distribution of flood levels, including the likelihood of exceeding the PMF, and explicitly characterizing aleatory variability and epistemic uncertainty.<br />
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{{#tag:div|'''MORE INFO COMING SOON''' — This page is under active development. Detailed content will be available in an upcoming update to the External Hazards Knowledge System.|style=background:#E8F4FD;color:#1B4F72;padding:16px;border:2px solid #85C1E9;border-radius:8px;font-size:110%;margin:24px 0;text-align:center;}}<br />
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''Return to [[Methods and Tools]].'' | ''EPRI technical point of contact: Chris Rochon ([mailto:CRochon@epri.com CRochon@epri.com])''<br />
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''Date last reviewed: 2026-05-07''</div>10.1.236.167