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A
Technical Guidance Manual:
Terminology and
Index Testing Procedures for Rolled Erosion Control Products
14. OPEN VOLUME PER UNIT AREA
14.1 Procedure
14.1.1 Determine thickness in accordance with Section 8.
14.1.2 Determine porosity in accordance with Section 12.
14.2 Calculation
14.2.1 Calculate open volume per unit area as follows.
| open volume per unit area, N | = t x n x 1296 (in2/yd2) or 10,000 (cm2/m2) |
| N | = open volume/unit area (in3/yd2) or (cm3/m2) |
| t | = thickness (inches) or (cm) |
| n | = porosity (%) |
14.3 Report
14.3.1 Report the open volume per unit area and denote whether it was calculated from published minimum, minimum average roll or typical values. If the value was obtained from a single test, denote that fact.
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