ACB Hydraulic Stability Standard appended to every report
Adopted per FHWA-RD-89-199, FHWA-RD-88-181, USACE EM 1110-1100 and Delft Hydraulics. Section 09 of every recommendation now sets out the four-clause documentary evidence required from any ACB sub-supplier, with a one-tap Evidence Request template to issue to a competing supplier.
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Cable Concrete® Compliance Pack
ACB Hydraulic Stability Standard — Adopted References
FHWA-RD-89-199 (Nov 1989) · FHWA-RD-88-181 (1988) · USACE Coastal Engineering Manual EM 1110-1100 (Aug 2008) · Delft Hydraulics ACB Revetment Program
This pack records the documentary evidence proving Cable Concrete® mats satisfy each of the four clauses of the ACB Hydraulic Stability Standard. The engineer of record may rely on this evidence as the supplier-side product compliance factor of safety for Cable Concrete® mats supplied through IECS Africa.
§1 ✓
Overtopping hydraulic stability test (FHWA-RD-89-199)
Cable Concrete® has been tested in accordance with FHWA-RD-89-199 (November 1989), Hydraulic Stability of Articulated Concrete Block Revetment Systems During Overtopping Flow. The procedure was administered on full-size CC 35 and CC 45 OS blocks at the University of Minnesota St Anthony Falls Laboratory (1999) and on additional Cable Concrete® block types at the Colorado State University Engineering Research Center (January 2005).
Cable Concrete® has been independently tested at three accredited university hydraulics laboratories, exceeding the §2 minimum:
Colorado State University — Engineering Research Center
January 2005 — 4 ft × 100 ft steep-gradient overtopping flume set at 2H:1V. Soil-bed flume testing of multiple Cable Concrete® block types.
University of Minnesota — St Anthony Falls Laboratory
1999, Report No. 434 — Full-size CC 35 and CC 45 OS. 253 ft × 9 ft × 6 ft flume. Bed slopes 1.5H:1V to 3.0H:1V.
University of Windsor — Hydraulics Laboratory
1988 — CC 70 channel-flow testing (1:10 scale, 40 ft flume). 2004 — CC 65 / CC 90 / CC 95 wave-flume testing.
§3 ✓
Four-hour continuous overtopping survival
Full-size CC 35 and CC 45 OS blocks survived continuous four-hour overtopping flow at SAFL (1999) with the following measured peak values:
Parameter
Measured peak
Test conditions
Shear stress
38.5 lb/ft² (1,843 N/m²)
Continuous 4-hour overtopping
Velocity
19.0 ft/s (5.79 m/s)
Bed slopes 1.5H:1V–3.0H:1V
Bed
Silty clay (CL)
Non-woven 6.1 oz/yd² polypropylene geotextile
Outcome
No failure
No geotextile failure, no block displacement
Primary source: University of Minnesota St Anthony Falls Laboratory Report No. 434, Test Runs 1–8 (1999).
§4 ✓
Documented field performance record
Criterion
Cable Concrete®
Year ACB revetment supply commenced
1984
Cumulative installed area
~16 million sq ft (~1.48 million sq m)
Distribution / supply
Worldwide; Sub-Saharan Africa via IECS Africa
Parent organisation
International Erosion Control Systems Inc. (Canada)
Project-specific reference letters and engineer-of-record contacts available from IECS Africa on request — contact@iecsafrica.com.
✓
All four clauses satisfied.
Cable Concrete® mats supplied through IECS Africa carry documented evidence against §1–§4 of the ACB Hydraulic Stability Standard. The product compliance factor of safety is met.
Considering a competing ACB product?
Issue the same §1–§4 evidence schedule to the alternative supplier before approving substitution. The button opens a pre-drafted email — recipient blank, body ready.
Need the full source PDFs?
The originals (SAFL Report 434, CSU 2005 Data Report, Windsor 1988/2004, FHWA-RD-89-199) are available from IECS Africa on request.
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ACBS Compliance Check — Evidence Schedule
ACB Hydraulic Stability Standard — Adopted References
FHWA-RD-89-199 (Nov 1989) · FHWA-RD-88-181 (1988) · USACE Coastal Engineering Manual EM 1110-1100 (Aug 2008) · Delft Hydraulics ACB Revetment Program
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Articulated concrete block revetment is a regulated engineering product. For any ACB system proposed on this project, the supplier shall return signed documentary evidence against the four clauses below within 14 days of receipt of this schedule. The standard is peer-reviewed and applied across the international hydraulic engineering community. Tap the email button at the foot of this page to issue the schedule.
§1
Overtopping hydraulic stability test
Test report demonstrating compliance with FHWA-RD-89-199 (1989). Full-scale or accredited-scale flume, continuous overtopping flow at the maximum design discharge. State bed slope, peak shear stress (lb/ft² and N/m²), peak velocity (ft/s and m/s), and overtopping duration.
§2
Independent third-party flume testing
Test reports from no fewer than three independent university hydraulics laboratories, each at an institution whose engineering faculty holds internationally recognised engineering accreditation.
§3
Four-hour continuous overtopping survival
Documented survival of a continuous four-hour overtopping test at the design discharge without geotextile failure, block displacement or subgrade deformation. Reference performance to be matched or exceeded: 38.5 lb/ft² peak shear and 19.0 ft/s peak velocity.
§4
Documented field performance record
Year supply of ACB revetment commenced; cumulative installed area in square metres; and three reference projects in Sub-Saharan Africa or comparable tropical / coastal environments, each with engineer of record, completion year, and current installation status.
Engineer's duty of care: Approval of any ACB product without documented evidence against all four clauses above transfers full responsibility for the hydraulic stability of the installed system to the engineer of record. Manufacturer marketing claims and uncertified test summaries do not satisfy this duty.
Opens your email app with the §1–§4 evidence schedule and 14-day response request pre-loaded. Recipient field left blank — select the supplier from your contacts.
✓
Evidence Request Issued
The §1–§4 evidence schedule has opened in your email app. Once you send it, the supplier has 14 days to return signed documentation against each clause.
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