Geosynthetics April/May 2021 - 27

Part 2

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. They 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.
In Part 1 of this two-part article, test methodologies and rationales were
presented for the evaluation and quantification of SRD performance in both
bench-scale and large-scale " as installed " scenarios. These standardized test
methods, ASTM D5141 and ASTM D7351, have proven to be an objective tool
for the evaluation of sediment filtration and water retention performance of
SRD systems. These objective evaluations can be used by designers, specifiers
and regulators to compare product-to-product performance and make decisions on the appropriate SRD system for a given project (Figure 1).
In Part 2 of this article, the results of historical testing efforts will be presented, providing a robust and compelling data set, and an in-depth analysis of
the results will be discussed. Products will be defined by product category, and
categories will be compared for general performance. These objective, datadriven comparisons will help designers, specifiers and regulators make informed
decisions on the appropriate SRD system to use on any given jobsite.

ASTM D5141 and ASTM D7351 SRD testing results
ASTM D5141 and D7351 testing are most commonly used by various state
departments of transportation (DOTs) to confirm that SRDs conform to state
specifications for sediment removal and sustained seepage. DOT projects are typically linear, requiring the extensive use of toe-of-slope SRDs, such as silt fence,
wattles and compost socks. As a result, DOTs must often be mindful of excessive
ponding behind SRDs caused by sediment buildup on SRDs that might cause

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.

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27


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Geosynthetics April/May 2021

Table of Contents for the Digital Edition of Geosynthetics April/May 2021

Geosynthetics April/May 2021 - Cover1
Geosynthetics April/May 2021 - Cover2
Geosynthetics April/May 2021 - 1
Geosynthetics April/May 2021 - 2
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