Downloadable Files

Download Printable Brochure
Dam or Filter (Land and Water Magazine Jan/Feb 2016)

Curlex Sediment Log uses excelsior fibers to reduce hydraulic energy & filter sediment-laden runoff. Tired of straw and hay bale checks being blown out and the fibers washed downstream to clog the nearest outlet?


Fed up with spending all of your time and efforts installing a silt fence only to see it be knocked down when it rains or a good wind comes along? How about when you have to go back and pick up the loose fibers and/or remove those worn-out silt fences and take them to the landfill? Next time, consider trying our environmentally friendly, naturally seed-free, Curlex Sediment Log. Water filters through (not underneath) the diameter of the porous, interlocked fiber log matrix. As it does, velocity is naturally reduced and sediment is collected on the upstream side of the excelsior fiber log. Install Sediment Log over bare soil and/or biodegradable & permanent erosion control blankets, on steep slopes as a wattle, around drains for inlet protection, or around job sites for perimeter control.

Here are two photos of a Curlex Sediment Log that was cut apart to show the fine clay that was retained within the product after contaminated stormwater runoff filtered through the porous matrix.  The photo on the left shows a cross-section of the Curlex Sediment Log and the photo on the right shows all the fine soil that was inside the Curlex Sediment Log after it was broken up for demonstration purposes of the photo:

Sediment_inside_Sediment_Log_medium     Curlex_Sediment_Log_Soil_Inside_After_Busted_Apart_medium



Material Characteristics


Curlex Sediment Log is a versatile excelsior log comprised of an outside containment fabric and filled with unique Curlex® fibers. Curlex fibers are made of Great Lakes Aspen excelsior fibers. The fibers are curled with soft interlocking barbs and 80% will be six inches in length or longer. Curlex is considered the industry standard by many because of the plethora of Curlex Features and Benefits.  The outside, open weave containment fabric is degradable, thus Curlex Sediment Log will degrade in place if not removed. Curlex Sediment Log is porous, allowing water to pass through the excelsior matrix, progressively slowing velocity and filtering sediment as it passes through the log diameter. Sediment Log is extremely flexible and contours to the terrain to maintain intimate contact with the sub-grade. In addition, they come with six other benefits; lightweight, no trenching, no weed seeds, no disposal hassles, are re-usable, and hold their shape.



Product Name/Nominal Diametera
Length (±10%)
Weight (±10%)b
Net Opening (Hexagonal-Shaped)
20 in
3.05 m (10 ft)
13.62 kg (30 lb)
3.2 cm (1.3 in)
12 in
3.05 m (10 ft)
9.02 kg (20 lb)
2.5 cm (1 in)
9 in
7.62 m (25 ft)
11.35 kg (25 lb)
1.9 cm (.75 in)
6 in
7.62 m (25 ft)
5.45 kg (12 lb)
1.3 cm (.5 in)

Performance Requirements

Flow Rate (GPM/ft2)
≥ 35
ASTM D5141
Slope Soil Loss Reduction (%)
≥ 70
Quantified Researchc
Channel Soil Loss Reduction (%)
≥ 50
ASTM D7208
pH Buffering
8 ± 3
ASTM D1117, modified
Functional Longevityd
≤ 24 Months
Documented Laboratory and Field Studies
Oil Sorbent
U.S. Environmental Protection Agency
Removal of Polynuclear Aromatic Hydrocarbons (PAHs)
≥ 95%
Quantified Researche
Fly Ash Filtration (TSS)
≥ 78%
Quantified Researchf
Fly Ash Filtration (NTU)
≥ 76%
Quantified Researchf

Curlex Sediment Log Design Values with Comparisons to Typical Straw Wattles

Channel Design
Slope Design
Product Name/Nominal Diametera
GPM/linear ft of installed product
P Factorh
% Soil Retained
6 in Curlex Sediment Log
9 in Straw Wattle
9 in Curlex Sediment Log
12 in Straw Wattle
12 in Curlex Sediment Log
20 in Curlex Sediment Log

a Custom sizes available.
b Weight and density are based on a dry weight basis at the time of manufacture. Baseline moisture content of Great Lakes Aspen Excelsior, AEC Premier Straw, and AEC Premier Coconut fibers are 22%, 15%, and 20%, respectively.
c Kelsey, K., T. Johnson, and R. Vavra. 2006. ”Needed Information: Testing, Analysis, and Performance Values for Slope Interruption and Perimeter Control BMPs.” IECA Conference Proceedings. P. 171-181.”
d Functional Longevity varies from region to region because of differences in climatic conditions.
e Boving and Zhang, Chemosphere 54 (2004) 831-839.
f Kelsey, K., and M. Murley. (2017, January). Fly Ash Slurry Filtration Using Curlex® Sediment Log®–Quantifying Total Suspended Solids and Turbidity Reduction. Unpublished internal document, ErosionLab.
g Based on ASTM D5141.
h Based on large simulated rainfall testing.

Typical Applications

Energy dissipation and Sediment Control Device for:

  • Ditch bottoms, swales, and waterways
  • Over bare soils and/or temporary & turf reinforcement mats (TRMs)
  • Drop structures and let down structures
  • 360-degree protection around catch basins & drop inlet structures
  • Curb & drainage outlets
  • Project ingress & egress termination points
  • As wattles on steep slopes
  • Site perimeter control
  • Use in place of bales, silt fence, reinforced silt fence, and rock checks


Design Resources

Curlex Sediment Log Design Values

Channel and Slope Design Values for Curlex Sediment Log

Recommended Spacing Between Curlex Sediment Logs in Channelized Flow Applications

(U.S. Customary Units)

Recommended Spacing Between Curlex Sediment Logs on Slopes

(U.S. Customary Units)

Curlex Sediment Log perimeter control testing
Watch the Difference in Flow Rates Between a Curlex Sediment Log and a straw wattle





Curlex Sediment Log Case Studies

Dam or Filter: What’s the Difference When it Comes to Sediment Control?
Pikes Peak Erosion Control Challenges
Community Comes Together – Curlex NetFree, Enforcer, Sediment Log

Suggested Specifications

– Sediment Control Device


sediment_4 Sediment Log consists of an outside, open weave, containment fabric filled with Great Lakes Aspen curled excelsior fibers. Its purpose is to provide a flexible, lightweight, porous, sediment control device demonstrating the ability to conform to terrain details and dissipate water velocity in concentrated flow areas.

Sediment Control Device shall be Curlex Sediment Log, as manufactured by American Excelsior Company. Curlex Sediment Log shall be made of Great Lakes Aspen Excelsior fibers encased in an outside open weave containment fabric. Fibers shall be curled with soft, interlocking barbs to form a strong, organic filtration matrix. A minimum of 80 percent sediment_7of the fibers shall be 15 cm (6 in) or greater in length. Fibers shall be evenly distributed throughout the diameter and length of the Sediment Log. Fibers shall be naturally seed-free. Excelsior color shall be standard Aspen (natural). Netting at each end of the log shall be secured to assure fiber containment.

Technical Support

Visit our Technical Support Library to view all Technical Support Documents by clicking on Technical Support at the top of any page or please Contact Us if you have further questions.

Disclaimer: Curlex Sediment Log is a system for sediment control in channels and on slopes. American Excelsior Company (AEC) believes that the information contained herein to be reliable and accurate for use in sediment control applications. However, since physical conditions vary from job site to job site and even within a given job site, AEC makes no performance guarantees and assumes no obligation or liability for the reliability or accuracy of the information contained herein, for the results, safety, or suitability of using Sediment Log, or for damages occurring in connection with the installation of any erosion control product whether or not made by AEC or its affiliates, except as separately and specifically made in writing by AEC. These specifications are subject to change without notice.