Astm D338518 Pdf Jun 2026

The primary objective of the test is to compute the at which water permeates an undisturbed soil layer. The data generated establishes standard parameters used extensively across several fields:

To achieve a steady-state infiltration rate, the soil often needs to be pre-wetted. Water is added to both the inner and outer rings simultaneously, maintaining an equal fluid level in both. 4. Taking Measurements (Constant Head vs. Falling Head)

The data collected from the inner ring is used to calculate both the incremental infiltration rate and the cumulative infiltration. Incremental Infiltration Rate The infiltration velocity (

To obtain an official, legally compliant copy of the standard: astm d338518 pdf

Comprehensive Guide to ASTM D3385-18: Standard Test Method for Infiltration Rate of Soils Using Double-Ring Infiltrometer

A critical note in the standard (section 5.4) states that tests performed at the same site are likely to produce varying results due to many factors (e.g., soil structure, layering, temperature). Therefore, the results of this test are primarily intended for comparative analysis under similar conditions rather than for deriving an absolute permeability value.

The legitimate cost (≈$60) is minor compared to the cost of a failed project or failed regulatory inspection. The primary objective of the test is to

Knowing the infiltration rate is crucial for many applications. According to the standard, it has "application to such studies as liquid waste disposal, evaluation of potential septic-tank disposal fields, leaching and drainage efficiencies, irrigation requirements, water spreading and recharge, and canal or reservoir leakage".

Gently tamp the soil along the inside and outside edges of both ring walls to eliminate any artificial voids or paths created during driving. Place a thin layer of fine sand or a splash guard cloth inside the inner ring to prevent the incoming water from eroding or scouring the soil surface. Step 4: Adding Water and Maintaining Head

. It is primarily conducted at the ground surface or in shallow trenches, making it ideal for relatively uniform soils without large rocks or high gravel content. Why the "Double-Ring" Design Matters Incremental Infiltration Rate The infiltration velocity ( To

Assessing the efficiency of septic-tank disposal fields.

The standard outlines the following test methods:

Designing retention ponds, bioswales, and permeable pavements requires accurate infiltration rates to ensure structures handle peak rainfall events.