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Geotextile Filtration Apparent Opening Size (AOS) & Soil Retention Calculator

Easily calculate and compute geotextile filtration apparent opening size (aos) & soil retention calculator with accurate equations, live formulas, and expert guidance.

Particle size at which 85% of soil mass is finer.

Particle size gradation distribution factor.

Permeability of retained foundation soil.

Calculated Result
0.36 mm

Max AOS (O_95)

Max AOS (O_95)

0.36 mm

Max Allowable Aos O95 Mm

0.36

Max Allowable Us Sieve Number

No. 50 Sieve (300 µm)

Min Required Geotextile Permeability Cm S

0.03

Permeability Crossflow Ratio

k_geotextile >= 10 x k_soil (Prevents hydraulic blinding and excessive pore pressure buildup)

0.36 — mm

Calculation Breakdown

  1. Applied FormulaSizes non-woven and woven geotextile filter fabrics for French drains, revetments, and MSE walls based on FHWA particle retention (AOS / O95) and permeability criteria.O_{95} \le B \cdot d_{85}

Geotextile Filtration & AOS Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.00.30.50.81.0Max AOS (O_95)

What Is the Geotextile Filtration Apparent Opening Size (AOS) & Soil Retention Calculator?

This tool computes geotextile filtration apparent opening size (aos) & soil retention calculator with high precision arithmetic.

How Does the Geotextile Filtration Apparent Opening Size (AOS) & Soil Retention Calculator Work?

Sizes non-woven and woven geotextile filter fabrics for French drains, revetments, and MSE walls based on FHWA particle retention (AOS / O95) and permeability criteria.

Geotextile Filtration Apparent Opening Size (AOS) & Soil Retention Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

O95≤B⋅d85O_{95} \le B \cdot d_{85}

Sizes non-woven and woven geotextile filter fabrics for French drains, revetments, and MSE walls based on FHWA particle retention (AOS / O95) and permeability criteria.

How to Use the Geotextile Filtration Apparent Opening Size (AOS) & Soil Retention Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

Geotextile Filtration Apparent Opening Size (AOS) & Soil Retention Calculator Example

Input Values:

soilGrainSizeD85Mm:0.180
soilUniformityCoefficientCu:4.5
soilPermeabilityKSoilCmS:3.0e-3
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required mm.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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