Geosynthetics February/March 2021 - 29

of 300 pounds (136 kg) for a 20-foot
(6.1-m) SRD installation, or a sediment
concentration of approximately 6%. A
constant valved discharge is released
evenly across the slope for 30 minutes
to replicate the peak 30 minutes of the
prescribed storm event.
Periodic grab samples are taken as
influent discharge flows through, over
or under the installed SRD and into the
collection tank. Depth and weight of the
collected seepage inside the collection
tank is measured and recorded at the
same intervals. Observations such as
height of ponding, undermining, overtopping and the associated times are
recorded. The grab samples are evaluated in a lab to determine percent solids
content of the filtrate and to determine
the percent filtering efficiency of the
installed SRD.

objective, data-driven comparisons will
help designers, specifiers and regulators make informed decisions on the
appropriate SRD system to use on any
given jobsite.
References
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. American Society for Testing and
Materials, West Conshohocken, Pa.

>> For more, search SRD
at www.GeosyntheticsMagazine.com.

	

ASTM D7351. Standard Test Method for Determination
of Sediment Retention Device Effectiveness in Sheet
Flow Applications. American Society for Testing and
Materials, West Conshohocken, Pa. G

Conclusion
In Part 1 of this two-part article, test
methodologies and rationales have
been 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, provide a means for objective
evaluations of sediment filtration and
water retention performance of SRD
systems. These objective evaluations
can be used by designers, specifiers
and regulators to compare product-toproduct performance and make decisions on the appropriate SRD system for
a given project.
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

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27


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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
Geosynthetics February/March 2021 - 4
Geosynthetics February/March 2021 - 5
Geosynthetics February/March 2021 - 6
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