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

docs/web-applications/system-response/cle-foundation-abutment-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 Foundation/Abutment Compaction Screening Technical Reference Manual
+reportSubTitle: System Response Library
+reportAuthors: ['Adam Gohs, P.E.']
+reportAbstract: Technical reference documenting the concentrated leak erosion (CLE) screening model for poor compaction along the foundation or abutment contact in the System Response library. The model computes a system response probability (SRP) at each headwater level from the eight-node CLE event tree. The probability of a continuous flaw is scored from three site factors (the preparation of the foundation or abutment surface, the method used to compact the embankment fill against it, and the width and width-to-height ratio of the embankment section) by risk-factor and likelihood-factor scoring, and is multiplied by a flaw-continuity probability keyed to the compaction method; a well-prepared surface forces the flaw probability to a negligible value. The flaw sits at the embankment-foundation contact, or for an abutment at an elevation one third of the way from normal pool to the crest. Initiation is evaluated by a Monte Carlo cylindrical-pipe shear stress analysis. This manual documents what is specific to the mechanism and refers to the shared CLE and continuation manuals for the common methods.
+reportSubjectTerms: ['CLE', 'Concentrated Leak Erosion', 'Foundation Contact', 'Abutment Contact', 'Compaction', 'Foundation Preparation', 'Screening', 'Event Tree', 'System Response Probability', 'Risk Factor', 'Likelihood Factor', 'Cylindrical Pipe', 'Monte Carlo']
+citationGuide: 'U.S. Army Corps of Engineers, Risk Management Center, <i>Concentrated Leak Erosion Foundation/Abutment 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-foundation-abutment-compaction-screening"
+/>
+
+# Document Information
+
+<DocumentMetadata metadata={frontMatter} />

docs/web-applications/system-response/cle-foundation-abutment-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-foundation-abutment-compaction-screening"
+/>
+
+# Version History
+
+<TableVersionHistory
+  versions={['1.0']}
+  dates={['October 2026']}
+  descriptions={['Initial release as an online document.']}
+  modifiedBy={['-']}
+  reviewedBy={['-']}
+  approvedBy={['-']}
+/>

docs/web-applications/system-response/cle-foundation-abutment-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-foundation-abutment-compaction-screening" />
+
+# Preface
+
+This document provides a technical reference for the concentrated leak erosion (CLE) screening model for poor compaction along the foundation or
+abutment contact 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 zone of poorly compacted embankment fill placed against the foundation or an abutment. 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, one flaw-scoring scheme, one initiation analysis for compaction flaws,
+and one set of failure-pathway and progression rules. Those common 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 of 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 manual documents only what is specific to the foundation or abutment compaction mechanism — its flaw, its inputs, where it departs from the
+common event tree, and its assumptions — and refers to the specific chapters of the two shared manuals for the rest.
+
+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, its engineering basis,
+  a comparison with detailed methods, and how it draws on the shared CLE and continuation methods.
+- **[Input Parameters](./03-input-parameters.mdx)** — The inputs specific to the mechanism: the choice between a foundation and an abutment
+  contact and the elevations it requires, the three flaw-factor selections, the optional section dimensions for scoring, the initial pipe diameter
+  default, and the filter-presence selection, with a guide to the inputs shared with the family.
+- **[Flaw Assessment](./04-flaw-assessment.mdx)** — The base-of-flaw elevation, the three scored factors and their likelihood factors, the
+  weighted sum and its flaw-probability curve, the well-prepared-surface rule, and the flaw-continuity stage, with the resulting range of flaw
+  probabilities.
+- **[Event Tree](./05-event-tree.mdx)** — How the model populates each of the eight nodes, where it follows and where it departs from the common
+  tree, and how the SRP is computed.
+- **[Assumptions and Limitations](./06-assumptions-and-limitations.mdx)** — Each assumption specific to the mechanism, 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 flaw-assessment results the model reports, how they bound the system
+  response curve, and how to read and check a result.

docs/web-applications/system-response/cle-foundation-abutment-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-foundation-abutment-compaction-screening" />
+
+# Model Overview
+
+## Purpose
+
+The model computes a system response curve for concentrated leak erosion through poorly compacted fill along the foundation or abutment contact,
+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 this mechanism, given that pool level.
+
+The mechanism is a continuous zone of loose or poorly compacted embankment fill against the surface the embankment is built on — the foundation
+along the valley floor, or the abutment along the valley walls. Such a zone forms where the foundation surface was left irregular or poorly
+prepared, or where the fill against it could not be, or was not, compacted as well as the body of the embankment. Water from the reservoir flowing
+along the zone can erode its walls; if the exit is unfiltered and the enlarging pipe stays open, the erosion can progress to breach.
+
+## Intended Use
+
+The model is a screening-level assessment of concentrated leak erosion along the foundation or abutment contact. Like the other CLE screening
+models, it makes simplifying and generally conservative assumptions to prevent false negatives and to reduce input burden (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 common methods
+manual). The placement of an abutment flaw by the normal-pool heuristic is an exception: for a flaw that lies lower on the abutment it is
+unconservative, because it gives a negligible SRP from the actual flaw elevation up to the heuristic elevation above normal pool (see Assumption 2
+in [Assumptions and Limitations](./06-assumptions-and-limitations.mdx#flaw-location)). For this mechanism the input burden is reduced to three qualitative selections describing the contact — the foundation material, how its
+surface was prepared, and how the fill against it was compacted — together with the embankment section and the screening inputs shared by the
+family.
+
+The model is not intended for detailed or semi-quantitative risk assessments (see
+[Comparison with Detailed Models](#comparison-with-detailed-models)).
+
+## How the Model Works
+
+The model executes the three stages common to the CLE family (see
+[How the Model Works](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/cle-common-methods-screening/v1.0/model-overview#how-the-model-works) in the
+common methods manual), with the following mechanism-specific content:
+
+1. **Flaw assessment** — The model places the base of the flaw at the embankment–foundation contact elevation for a foundation contact, or at
+   one third of the way from normal pool to the crest for an abutment contact. It scores three factors: the preparation of the foundation or
+   abutment surface, the method used to compact the fill in the contact zone, and the width and width-to-height ratio of the embankment section.
+   The weighted score is converted to a raw flaw probability, which is multiplied by a flaw-continuity probability keyed to the compaction method.
+   A well-prepared surface forces the flaw probability to a negligible value. The model has no observation override
+   (see [Flaw Assessment](./04-flaw-assessment.mdx)).
+
+2. **Pathway resolution** — The failure pathway runs through the embankment section at the base of the flaw. The user states whether a filter
+   intercepts it; the materials it passes through set roof support; and the upstream seepage-limiting elements are checked against the base of the
+   flaw (see [Event Tree](./05-event-tree.mdx)).
+
+3. **Event-tree assembly** — At each headwater level, the model multiplies the eight node probabilities. Initiation is the cylindrical-pipe Monte
+   Carlo analysis of the common methods, with this model's default initial pipe diameter; every other node is the same at every pool level
+   (see [Event Tree](./05-event-tree.mdx)).
+
+## Physics Basis
+
+The model combines the methods of the CLE family (see
+[Physics Basis](https://usace-rmc.github.io/RMC-Software-Documentation/docs/web-applications/system-response/cle-common-methods-screening/v1.0/model-overview#physics-basis) in the common methods
+manual). Specific to this mechanism:
+
+- **Risk-factor and likelihood-factor scoring** of the probability of a continuous flaw along the contact <Citation citationKey="Fell2024" />, with
+  three factors that describe the contact surface, the compaction of the contact zone, and the embankment section, and a flaw-continuity stage
+  keyed to the compaction method (see [Flaw Assessment](./04-flaw-assessment.mdx)).
+- **Hydraulic shear stress on the walls of a cylindrical pipe** at the base of the flaw, compared with the critical shear stress assigned
+  through the core soil classification, by the cylindrical-pipe initiation analysis shared by the four compaction models (see
+  [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)
+  in the common methods manual). Which soil along the contact that classification describes is requested at marker IN-14 in
+  [Initiation Default](./03-input-parameters.mdx#initiation-default).
+- **Tabulated progression probabilities** for roof support, crack filling, and flow limitation <Citation citationKey="Fell2024" />, applied as for
+  every compaction model, and **filter evaluation** by the shared continuation method when a filter intercepts the pathway.
+
+## Comparison with Detailed Models
+
+The detailed counterpart is an internal-erosion risk analysis of a flaw at the soil–rock or soil–soil contact, following
+Fell et al. (2024) <Citation citationKey="Fell2024" /> in full. The common methods manual compares the CLE screening family with the detailed methods (see
+[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)).
+<TableReference tableKey="cle-foundation-abutment-screening-table-1" /> lists the differences specific to this mechanism.
+
+<TableVertical
+  tableKey="cle-foundation-abutment-screening-table-1"
+  alt="Comparison of the foundation or abutment compaction screening model and a detailed analysis"
+  caption="Comparison of the foundation or abutment compaction screening model and a detailed analysis."
+  headers={[[{ value: 'Aspect' }, { value: 'Screening Model' }, { value: 'Detailed Analysis' }]]}
+  columns={[
+    [
+      'Flaw probability',
+      'Flaw location',
+      'Foundation defects',
+      'Section geometry',
+      'Observed seepage at the contact',
+    ],
+    [
+      'Scored from three selections and the section dimensions',
+      'One elevation: the contact, or a heuristic level for an abutment',
+      'Described only through the surface preparation selection',
+      'Width and height of the core section, or the shell, unless the user supplies them',
+      'Not accepted as an override',
+    ],
+    [
+      'Estimated by the risk team from the totality of the evidence',
+      'Located from construction records, geology, and performance',
+      'Continuous rock defects assessed separately from the treatment',
+      'Section at the flaw location',
+      'Weighed directly as evidence of a flaw',
+    ],
+  ]}
+/>
+
+## Relationship to the Shared Methods
+
+The model shares everything except its flaw assessment with the other CLE compaction models:
+
+- **Common CLE methods** — the event tree and SRP product, the risk-factor and likelihood-factor scoring and flaw-continuity conventions, the
+  cylindrical-pipe initiation analysis with its critical shear stress table, and the roof-support, crack-filling, and flow-limitation tables are
+  documented 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).
+  [Event Tree](./05-event-tree.mdx) links each node to its section there.
+- **Continuation** — when a filter intercepts the pathway, the continuation node is the result of the shared continuation 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)
+  (see [Node 3: Continuation](./05-event-tree.mdx#node-3-continuation)).
+
+Within the family, the model is closest to the core compaction model: both band the width and width-to-height ratio of the embankment section,
+both place a flaw by the normal-pool heuristic (here only for an abutment contact), both apply the flaw-continuity stage, and both use the same
+default initial pipe diameter range. It differs in having a foundation-preparation factor in place of a core-compaction category, a
+well-prepared-surface rule in place of an observation override, and in the factor that keys the flaw-continuity stage: both key it to their
+compaction factor, but here that factor carries a risk factor of 2, while in the core compaction model it is the factor with the highest risk
+factor, 3.
+
+<CitationFootnote />