[Content] Add the Concentrated Leak Erosion Core Compaction Screening technical reference manual to the System Response Library

docs/web-applications/system-response/cle-core-compaction-screening/v1.0/00-document-info.mdx

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+---
+title: Document Info
+reportDate: October 2026
+reportType: Technical Reference
+reportTitle: Concentrated Leak Erosion Core Compaction Screening Technical Reference Manual
+reportSubTitle: System Response Library
+reportAuthors: ['Adam Gohs, P.E.']
+reportAbstract: Technical reference documenting the concentrated leak erosion (CLE) core compaction screening model in the System Response library. The model computes a system response probability (SRP) at each headwater level for concentrated leak erosion through a continuous zone of poorly compacted soil within the embankment core. The probability of the flaw is estimated by risk-factor and likelihood-factor scoring of the core compaction category, the width and width-to-height ratio of the embankment section, and borrow variability, followed by a flaw-continuity stage keyed to the compaction category; an observation of embankment leakage or wet spots overrides the flaw probability to certainty and sets the flaw elevation. Initiation is evaluated by a Monte Carlo cylindrical-pipe hydraulic shear stress analysis at the base of the flaw, and the remaining nodes of the eight-node CLE event tree follow the methods shared by the CLE screening family. The model applies simplifications appropriate for screening-level risk analysis.
+reportSubjectTerms: ['CLE', 'Concentrated Leak Erosion', 'Core Compaction', 'Poor Compaction', 'Screening', 'Event Tree', 'System Response Probability', 'System Response Curve', 'Risk Factor', 'Likelihood Factor', 'Cylindrical Pipe', 'Critical Shear Stress', 'Monte Carlo']
+citationGuide: 'U.S. Army Corps of Engineers, Risk Management Center, <i>Concentrated Leak Erosion Core Compaction Screening Technical Reference Manual</i>, Lakewood, CO: U.S. Army Corps of Engineers, Risk Management Center, 2026.'
+---
+
+import Link from '@docusaurus/Link';
+import DocumentMetadata from '@site/src/components/DocumentMetadata';
+import NavContainer from '@site/src/components/NavContainer';
+
+<NavContainer
+  link="/web-applications/system-response"
+  linkTitle="System Response Library"
+  document="web-applications/system-response/cle-core-compaction-screening"
+/>
+
+# Document Information
+
+<DocumentMetadata metadata={frontMatter} />

docs/web-applications/system-response/cle-core-compaction-screening/v1.0/00-version-history.mdx

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+---
+title: Version History
+---
+
+import NavContainer from '@site/src/components/NavContainer';
+import TableVersionHistory from '@site/src/components/TableVersionHistory';
+
+<NavContainer
+  link="/web-applications/system-response"
+  linkTitle="System Response Library"
+  document="web-applications/system-response/cle-core-compaction-screening"
+/>
+
+# Version History
+
+<TableVersionHistory
+  versions={['1.0']}
+  dates={['October 2026']}
+  descriptions={['Initial release.']}
+  modifiedBy={['-']}
+  reviewedBy={['-']}
+  approvedBy={['-']}
+/>

docs/web-applications/system-response/cle-core-compaction-screening/v1.0/01-preface.mdx

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+---
+title: Preface
+---
+
+import NavContainer from '@site/src/components/NavContainer';
+
+<NavContainer link="/web-applications/system-response" linkTitle="System Response Library" document="web-applications/system-response/cle-core-compaction-screening" />
+
+# Preface
+
+This document provides a technical reference for the concentrated leak erosion (CLE) core compaction screening model in the System Response
+library. The model computes a system response probability (SRP) as a function of headwater elevation for concentrated leak erosion through a
+continuous zone of poorly compacted soil within the embankment core. It is a screening-level model: it applies simplifications intended to reduce
+input burden while avoiding false negatives, and any application that performs screening-level risk analysis can use it.
+
+The model is one of eight CLE screening models that share one event tree and most of their methods. Those shared methods are documented once, in
+the [Concentrated Leak Erosion Common Methods Screening Technical Reference Manual](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/cle-common-methods-screening/v1.0/preface),
+and the continuation node is evaluated by the shared method documented in the
+[Continuation (Filter Evaluation) Screening Technical Reference Manual](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/continuation-screening/v1.0/preface).
+This document covers what is specific to the core compaction mechanism: its flaw assessment, its mechanism-specific inputs, how it populates each
+node of the shared event tree, the assumptions it adds, and the results it reports. Each section that relies on a shared method links the chapter
+that documents it.
+
+The intended audience includes dam safety engineers evaluating whether the model is appropriate for their assessment, and peer reviewers checking
+the technical basis of screening-level results. Readers are assumed to have a general background in internal-erosion risk analysis — event trees,
+concentrated leak erosion mechanics, and probability concepts — but no familiarity with the software implementation is required.
+
+## Document Organization
+
+- **[Model Overview](./02-model-overview.mdx)** — The model's purpose and intended use, a summary of its execution pathway from inputs to
+  results, its engineering basis, a comparison with detailed methods, and how it relates to the shared CLE methods and the toolbox methods.
+- **[Input Parameters](./03-input-parameters.mdx)** — The mechanism-specific inputs (the normal pool elevation, the core compaction category, the
+  leakage observation and its elevation, and the optional flaw base width and height), and how the model takes each of the inputs it shares with
+  the CLE family.
+- **[Flaw Assessment](./04-flaw-assessment.mdx)** — The three scored factors, the weighted sum and its flaw-probability curve, the flaw-continuity
+  stage, the resulting flaw probabilities, the observation override, and the base-of-flaw elevation.
+- **[Event Tree](./05-event-tree.mdx)** — How the model populates each of the eight nodes, including the cylindrical-pipe initiation analysis and
+  the continuation method it delegates to, and how the SRP is computed.
+- **[Assumptions and Limitations](./06-assumptions-and-limitations.mdx)** — Each assumption the model adds to the shared CLE assumptions, with its
+  engineering basis, its effect on results, and the conditions under which it may not hold.
+- **[Output and Interpretation](./07-output-and-interpretation.mdx)** — The results the model produces, how to read the flaw assessment and the
+  system response curve, checks on a result, and the role of screening results relative to detailed analysis.

docs/web-applications/system-response/cle-core-compaction-screening/v1.0/02-model-overview.mdx

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+---
+title: Model Overview
+---
+
+import Citation from '@site/src/components/Citation';
+import CitationFootnote from '@site/src/components/CitationFootnote';
+import NavContainer from '@site/src/components/NavContainer';
+import TableReference from '@site/src/components/TableReference';
+import TableVertical from '@site/src/components/TableVertical';
+
+<NavContainer link="/web-applications/system-response" linkTitle="System Response Library" document="web-applications/system-response/cle-core-compaction-screening" />
+
+# Model Overview
+
+## Purpose
+
+The CLE core compaction screening model computes a system response curve for concentrated leak erosion through a continuous zone of poorly
+compacted soil within the embankment core, as a function of headwater elevation. The system response probability (SRP) at each headwater level is
+the conditional probability of breach of the embankment by concentrated leak erosion along such a zone, given that pool level.
+
+The flaw is a zone of poorly compacted soil that runs continuously through the core from the upstream face to the downstream face, so that water
+from the reservoir can flow along it. The model idealizes the zone as a horizontal cylindrical pipe at a base-of-flaw elevation. Erosion begins when
+the hydraulic shear stress of the flow on the pipe wall exceeds the critical shear stress of the core soil, and breach requires the further
+conditions common to every concentrated leak erosion failure mode: an unfiltered exit, a pipe that stays open and is neither filled nor starved of
+flow, unsuccessful intervention, and an uncontrolled release of the impounded water (see the
+[Model Overview](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/cle-common-methods-screening/v1.0/model-overview#purpose) of the CLE Common Methods
+manual).
+
+## Intended Use
+
+The model is a screening-level assessment of concentrated leak erosion through poorly compacted core material. Like the other CLE screening models,
+it makes simplifying and generally conservative assumptions with two goals
+(see [Intended Use](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/cle-common-methods-screening/v1.0/model-overview#intended-use) in the CLE Common
+Methods manual):
+
+- **Preventing false negatives** — The model is designed to avoid underestimating risk at the screening level, so that embankments with a
+  potential core compaction concern are flagged for further analysis.
+- **Reducing input burden** — A qualitative core compaction category and the dimensions of the embankment section stand in for a detailed review of
+  construction records, and default distributions cover the critical shear stress of the core soil and the initial diameter of the flaw. Where the
+  compaction of the core is not known, the user selects Unknown rather than guessing.
+
+The model is not intended for detailed or semi-quantitative risk assessments. For those, the concentrated leak erosion toolbox methods and the
+internal-erosion probability methods of Fell et al. (2024) <Citation citationKey="Fell2024" /> provide the complete methodologies (see
+[Comparison with Detailed Models](#comparison-with-detailed-models)).
+
+## How the Model Works
+
+The model executes three stages:
+
+1. **Flaw assessment** — The model scores three factors: the core compaction category, the continuity of the embankment section (its base width and
+   its width-to-height ratio), and borrow variability, which is fixed. The weighted sum of the scores is converted to a raw flaw probability, which
+   is multiplied by a flaw-continuity probability keyed to the compaction category. The base of the flaw is placed one third of the way from the
+   normal pool to the crest. An observation of embankment leakage or wet spots replaces both results: the flaw probability becomes 1.0 and the base
+   of the flaw becomes the observed elevation. The flaw probability is the same at every pool level (see [Flaw Assessment](./04-flaw-assessment.mdx)).
+
+2. **Pathway resolution** — The flaw is at one elevation, so the failure pathway is fixed: the user states whether a filter intercepts it by
+   supplying, or omitting, the filter and base-soil description, and lists the embankment materials the pipe passes through and the upstream
+   seepage-limiting elements present. A wall whose top is below the base of the flaw is set aside (see [Event Tree](./05-event-tree.mdx)).
+
+3. **Event-tree assembly** — At each headwater level, the model multiplies the probabilities of the eight CLE event-tree nodes to produce the SRP.
+   Initiation is evaluated by a Monte Carlo cylindrical-pipe analysis of the hydraulic shear stress at the base of the flaw and is the only node that
+   varies with pool level; the other seven nodes are each one value (see [Event Tree](./05-event-tree.mdx)).
+
+## Physics Basis
+
+The model combines the following engineering methods:
+
+- **Risk-factor and likelihood-factor scoring** for the probability that a continuous poorly compacted zone exists, in which each factor is
+  assigned a likelihood factor, weighted by a risk factor, and the weighted sum is mapped to a flaw probability <Citation citationKey="Fell2024" />
+  (see the [Risk-Factor and Likelihood-Factor Scoring](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/cle-common-methods-screening/v1.0/flaw-conventions#risk-factor-and-likelihood-factor-scoring)
+  section of the CLE Common Methods manual)
+- **Hydraulic shear stress on the wall of a cylindrical pipe**, compared with the critical shear stress of the core soil, for the initiation of
+  erosion, as documented in the
+  [Cylindrical Pipe](/docs/toolbox-technical-manuals/internal-erosion-suite/concentrated-leak-erosion-initiation/v1.0/cylindrical-pipe) chapter
+  of the Concentrated Leak Erosion Initiation manual
+- **Filter evaluation** for the probability that erosion continues past a filter intercepting the pathway, through the shared continuation method
+  documented in the
+  [Method Selection and Governing Base Soil](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/continuation-screening/v1.0/method-selection-and-governing-base-soil)
+  chapter and the method chapters of the Continuation (Filter Evaluation) Screening manual
+- **Roof-support, crack-filling, and flow-limitation probabilities** for the progression conditions <Citation citationKey="Fell2024" />, as
+  documented in the
+  [Failure Pathway and Progression](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/cle-common-methods-screening/v1.0/failure-pathway-and-progression)
+  chapter of the CLE Common Methods manual
+
+## Comparison with Detailed Models
+
+The detailed counterparts of the screening model are the concentrated leak erosion toolbox methods and the internal-erosion probability methods of
+Fell et al. (2024) <Citation citationKey="Fell2024" /> applied in full. The comparison that holds for the whole CLE family is given in
+[Comparison with Detailed Models](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/cle-common-methods-screening/v1.0/model-overview#comparison-with-detailed-models)
+in the CLE Common Methods manual. <TableReference tableKey="cle-core-compaction-screening-table-1" /> summarizes the differences specific to a core
+compaction flaw.
+
+<TableVertical
+  tableKey="cle-core-compaction-screening-table-1"
+  alt="Comparison of the core compaction screening model and the detailed methods"
+  caption="Comparison of the core compaction screening model and the detailed methods."
+  headers={[[{ value: 'Aspect' }, { value: 'Screening Model' }, { value: 'Detailed Methods' }]]}
+  columns={[
+    ['Flaw probability', 'Flaw observed', 'Flaw elevation', 'Flaw geometry for initiation', 'Filter on the pathway'],
+    [
+      'Scored from the compaction category and the section geometry, with a fixed borrow-variability score',
+      'Leakage or wet spots set the flaw probability to 1.0',
+      'One third of the way from normal pool to crest, or the observed leakage elevation',
+      'Horizontal cylindrical pipe at the base of the flaw',
+      'User states filter presence; the shared screening filter evaluation gives one value at every pool level',
+    ],
+    [
+      'Estimated by the risk team from the totality of the evidence',
+      'Weighed by the risk team with the other evidence',
+      'Specified by the analyst',
+      'Cylindrical pipe or crack geometry (analyst selects)',
+      'Full filter evaluation of the base and filter soils',
+    ],
+  ]}
+/>
+
+## Relationship to the Common Methods and Toolbox Models
+
+The core compaction model is one of the four compaction models of the CLE family (see
+[The Two Model Groups](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/cle-common-methods-screening/v1.0/model-overview#the-two-model-groups) in the CLE
+Common Methods manual). It shares the following with the family, and this manual links the shared documentation rather than repeating it:
+
+- **The eight-node event tree and the SRP computation** — the
+  [Event Tree](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/cle-common-methods-screening/v1.0/event-tree) chapter of the CLE Common Methods manual.
+- **The scoring scheme, the flaw-continuity stage, and the normal-pool heuristic for the base of the flaw** — the
+  [Flaw Conventions](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/cle-common-methods-screening/v1.0/flaw-conventions) chapter.
+- **The cylindrical-pipe initiation analysis**, which the model hands to the same method as the standalone Concentrated Leak Erosion Initiation
+  toolbox, supplying the base of the flaw, the embankment section, and default distributions for the critical shear stress and the initial pipe
+  diameter — the
+  [Delegated Method: Cylindrical Pipe Initiation](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/cle-common-methods-screening/v1.0/initiation#delegated-method-cylindrical-pipe-initiation)
+  section of the Initiation chapter.
+- **The continuation, roof-support, crack-filling, and flow-limitation nodes** — the
+  [Failure Pathway and Progression](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/cle-common-methods-screening/v1.0/failure-pathway-and-progression)
+  chapter, with the continuation method itself in the Continuation (Filter Evaluation) Screening manual.
+
+What this manual documents in full is the flaw assessment ([Flaw Assessment](./04-flaw-assessment.mdx)), the mechanism-specific inputs
+([Input Parameters](./03-input-parameters.mdx)), and the choices this model makes where the family allows more than one
+([Event Tree](./05-event-tree.mdx)).
+
+<CitationFootnote />