A 19-chapter interactive deep-dive on retaining wall engineering, built from a single continuous use case: a sloped residential yard with active erosion and no usable flat space. The guide follows one property from topographic survey and geotechnical investigation through soil mechanics, drainage design, wall-system selection, code-based structural design (IBC, ASCE 7, ACI 318-19), construction sequencing, permitting and inspection, professional liability, cost, and long-term maintenance — with a real permit-grade drawing set illustrating every chapter.
Part I–II (Chapters 1–5) establish the problem and the ground beneath it: yard slope conditions and erosion symptoms, topographic site evaluation, applied soil mechanics, geotechnical investigation and boring logs, and drainage/groundwater/surface-water design. Part III (Chapters 6–7) compares gravity, cantilever reinforced concrete, segmental block, timber, and soldier-pile wall systems and selects the right one for the use case. Part IV (Chapters 8–11) works through code-governed structural design — lateral earth pressure (Rankine), sliding/overturning/bearing stability checks, and full ACI 318-19 stem and footing member design. Part V (Chapters 12–14) covers construction details, sequencing, and the most common field mistakes. Part VI–VII (Chapters 15–19) close out permitting and approvals, inspections and quality control, engineer/contractor/owner liability, cost breakdown, and long-term maintenance and monitoring.
Use the Prev / Next buttons at the bottom, or press the arrow keys on your keyboard. Click the ☰ menu button in the top-right to open the table of contents and jump to any chapter. Each chapter's reference drawing follows immediately after its text as its own dedicated, full-size slide, so permit-grade plans, sections, and schedules stay legible.
Structural and civil engineers and EITs who want a complete, code-grounded retaining wall design workflow in one place; contractors and inspectors who need to understand the drainage, reinforcement, and sequencing decisions behind the drawings they build and verify from; and property owners who want informed oversight of a retaining wall project on their own site, from first erosion symptom through long-term monitoring.
The guide covers 19 chapters built from a single residential use case: site evaluation and topography, applied soil mechanics, geotechnical investigation, drainage and groundwater management, retaining wall system selection, code-based structural design (lateral earth pressure, stability checks, and ACI 318-19 member design), construction details and sequencing, common field mistakes, permitting and inspections, engineer/contractor/owner liability, cost breakdown, and long-term maintenance — illustrated throughout with a real permit-grade civil, geotechnical, structural, and architectural drawing set.
The Residential Structural Integrity & Diagnostics guide is a 46-chapter survey of residential structural diagnostics and repair broadly, of which only 2 chapters touch on retaining walls. This guide is a single, dedicated 19-chapter deep-dive on retaining wall design and construction alone — soil mechanics, drainage, code-compliant structural calculations, constructability, permitting, liability, cost, and maintenance — following one project from problem identification through long-term performance.
Rankine theory, using the active earth pressure coefficient Ka = tan²(45° − φ/2). For the use case’s friction angle of φ = 30°, Ka ≈ 0.33, applied through the full sliding, overturning, and bearing stability checks and into the ACI 318-19 stem and footing reinforcement design.
The International Building Code (IBC), ASCE 7 for minimum design loads and load combinations (including seismic earth pressure via the Mononobe-Okabe method for higher seismic design categories), and ACI 318-19 for reinforced concrete design, alongside AASHTO LRFD and ASTM material standards shown on the permit-grade drawing set.
Because water pressure, not undersized reinforcement, is the most common cause of retaining wall distress and failure. Hydrostatic pressure from a clogged or omitted drainage system can exceed the lateral soil pressure the wall was actually designed for, which is why subdrains, weep holes, and free-draining backfill are treated as a primary structural consideration rather than an afterthought.
Disclaimer: This guide summarizes a representative retaining wall use case for educational purposes only. The project, site, and all figures are illustrative and not a real project. Always consult a licensed structural or geotechnical engineer and the applicable, locally adopted building codes for actual project design, permitting, and construction.