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Calculate the Unilock permeable paver minimum required surface infiltration rate for the local rainfall intensities.

Measurement Option
Permeable Paver
Joint Material
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Joint width
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Void Space Percentage
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Initial Surface Infiltration Rate
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Location

Click here for local rainfall intensities.

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Input Information
Permeable Paver
Joint Material
Joint width mm
Void Space Percentage %
Initial Surface Infiltration Rate inches/hourmm/hour
Location
Results
Minimum Infiltration Rate per rainfall intensity
2 year: Min. IN/HR MM/HR
10 year: Min. IN/HR MM/HR
100 year: Min. IN/HR MM/HR

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DISCLAIMER: Results in this calculator are based on newly installed projects with joint material of ASTM #8 or #9 and ASTM C1781 engineered infiltration test results. Stormwater values are for the locations listed are from NOAA precipitation estimates based on 5 minutes intensity and annual minimum rounded to the nearest 0.25 inch. Contact your local representative for more detailed information for your project.

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