Geosynthetics February/March 2021 - 23

Part 1

Comparative analysis of
the flow and filtration
capabilities of sediment
retention devices
By James E. Sprague and C. Joel Sprague

S

ediment retention devices (SRDs) include silt fences, wattles,
filter logs, compost socks and various types of stormwater inlet
protectors and are a widely used best management practice (BMP) to
provide sediment filtration from stormwater runoff while allowing
water passage. However, SRD performance varies greatly in flow rate
and filtration efficiency. Unfortunately, SRDs are frequently selected
without an objective quantitative means of knowing if the device can
be expected to be sufficiently effective in providing the desired balance between flow rate and filtration efficiency. There is a limited,
but growing, body of performance data related to the flow rate and
filtration capabilities of SRD products based on recognized standard
ASTM test procedures. SRD flow rate and filtration performance can
be accurately evaluated using the bench-scale standard test method,
ASTM D5141, Standard Test Method for Determining Filtering
Efficiency and Flow Rate of the Filtration Component of a Sediment
Retention Device Using Site-Specific Soil, or in large-scale " as installed " conditions using the standard test method, ASTM D7351,
Standard Test Method for Determination of Sediment Retention
Device Effectiveness in Sheet Flow Applications (Figure 1). These
test methods quantify both the sediment removal efficiency and the
associated flow rate of an SRD, so that the potential for either excessive sediment loss or the backup of runoff can be assessed.
This article details both the bench-scale (ASTM D5141) and
the large-scale (ASTM D7351) test procedures used for linear,
toe-of-slope devices and presents robust data on the comparative

James E. Sprague is lab
director for TRI Environmental
in Greenville, S.C.
C. Joel Sprague is senior
engineer and technical
director for TRI Environmental
in Greenville, S.C
All figures courtesy of the authors.

www.GeosyntheticsMagazine.com

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Geosynthetics February/March 2021

Table of Contents for the Digital Edition of Geosynthetics February/March 2021

Geosynthetics February/March 2021 - 1
Geosynthetics February/March 2021 - 2
Geosynthetics February/March 2021 - 3
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