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D5718-13 – Standard Test Method Technical Guide
ASTM D5718-13 establishes a comprehensive framework for the documentation and archival of numerical groundwater flow model applications. By adhering to this standard, hydrogeologists and engineers can ensure robust quality assurance and defensibility in their modeling efforts. The standard is issued under the fixed designation D5718 and was last approved in 2013.
📝 Model Documentation and Archival Components
Per Section 1.1, complete model documentation must include a written and graphical presentation of model assumptions and objectives, the conceptual model, code description, model construction, model calibration, predictive simulations, and conclusions. The archival process requires a file or set of files (in written and digital format) containing logs of significant model simulations (calibration, sensitivity, and prediction), supplemental calculations, a copy of the model source code or executable files, and the associated input and output data sets.
| 🟦 Documentation Component | 📐 Archival Requirement |
|---|---|
| Model Assumptions & Objectives | Written and graphical presentation |
| Conceptual Model | Written and graphical presentation |
| Code Description | Copy of source code(s) or executable file(s) used |
| Model Construction | Input and output data sets |
| Model Calibration | Logs of significant calibration simulations |
| Sensitivity Analysis | Supplemental calculations and detailed logs |
| Predictive Simulations | Logs, input, and output data sets for prediction runs |
| Conclusions | Final written summary and supporting data |
⚙️ Scope, Application, and Quality Assurance
While Section 1.3 specifically addresses saturated, uniform density groundwater flow, the documentation elements are stated to be applicable to a wide range of modeled processes and can be tailored accordingly. The standard functions as a critical quality assurance measure (Section 4.1), ensuring all components of a modeling study are transparent, reproducible, and defensible.
| 🟦 Designation | 📐 Referenced Standard Title |
|---|---|
| D653 | Terminology Relating to Soil, Rock, and Contained Fluids |
| D5490 | Guide for Comparing Groundwater Flow Model Simulations to Site-Specific Information |
| D5609 | Guide for Defining Boundary Conditions in Groundwater Flow Modeling |
| D5610 | Guide for Defining Initial Conditions in Groundwater Flow Modeling |
| D5611 | Guide for Conducting a Sensitivity Analysis for a Groundwater Flow Model Application |
💡 Tip: Integrating Professional Judgment
Section 1.6 clearly states that this guide cannot replace education or experience. It offers an organized collection of information and a series of options, but it does not recommend a specific course of action. The standard must always be applied with professional judgment and consideration of the project’s unique aspects.
📊 Key Components of a Groundwater Flow Model Application
A successful model application is built on clearly articulated objectives and assumptions. The standard guides the user through the entire workflow, from the initial conceptual model and code selection through model construction and calibration to final prediction simulations. Archival files must preserve the complete history of the modeling effort to support future review and defensibility.
⚠️ Tailoring for Non-Standard Applications
Per Section 1.4, this guide is not intended to be all-inclusive. Each model application is unique and may require supplementary documentation and archival. Users dealing with variable density, unsaturated flow, or other specialized processes must expand upon the presented elements to ensure comprehensive documentation.
❓ Frequently Asked Questions
🔍 How broadly can this guide be applied to different modeling studies?
Section 1.3 indicates that while specifically written for saturated, uniform density groundwater flow, the elements presented for documentation and archival are relevant and applicable to a wide range of modeled processes, both in and out of the realm of groundwater flow, and can be tailored for those applications.
💡 What is the primary purpose of formal documentation according to the standard?
According to Section 4.1 (Significance and Use), due to the significance of many decisions based upon modeling results, complete model documentation serves as a critical quality assurance mechanism to ensure the integrity and quality of the effort.
📌 Does this standard represent the standard of care for professional services?
No. Section 1.6 explicitly states this ASTM standard is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should it be applied without consideration of a project’s many unique aspects.
⚡ What specific items must be included in the model archival file?
Per Section 1.1, the archival file must contain logs of significant model simulations (calibration, sensitivity, prediction), supplemental calculations, model documentation, a copy of the source code(s) or executable file(s) used, and the input and output data sets for significant model simulations.