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Infiltration Rate Design

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

Measurement Option
Permeable Paver
Joint Material
--
Joint width
--
Void Space Percentage
--
Initial Surface Infiltration Rate
--
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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Unilock provides these tools, calculators and information as a free resource. It is the responsibility of the user to comply with any and all applicable standards, local building codes and governing regulations for your project and any associated aspects. It is your responsibility to consult with the appropriate professional(s) for the design of your project. Unilock will not be responsible for the accuracy, validity, execution, methods or use of results or any subsequent damages.
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    Traffic Estimates
    AADT FUNCTIONAL CATEGORY PERCENT COMMERCIAL # LANES ESTIMATED ESALS TOTAL ESALS
    500 Local 0.5% 2 719 14387
    1000 Local 1% 2 2825 56498
    5000 Local 1% 2 13516 270313
    10000 Minor Arterial/Collector 3% 2 79521 1590414
    15000 Minor Arterial/Collector 5% 2 196501 3930025
    20000 Principal Arterial 5% 2 259825 5196505
    40000 Principal Arterial 5% 2 509163 10183257
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    Subgrade Support
    CATEGORY NO. CLASSIFICATION DRAINAGE CHARACTERISTICS SUSCEPTIBILITY TO FROST ACTION Resilient Modulus (MR) for Typical Subgrade Conditions (psi)
    GOOD FAIR POOR
    1 Boulders/cobbles Excellent None 12,000 11,000 10,000
    2 GW, SW Excellent Negligible 11,000 10,000 7,000
    3 GP, SP Excellent to fair Negligible to slight 10,000 8,000 5,000
    4 GM, SM Fair to semi-impervious Slight to moderate 8,000 5,000 4,500
    5 GC, SC Practically impervious Negligible to slight 6,000 4,500 3,500
    6 ML. MI Typically poor Severe 5,000 3,500 2,500
    7 CL, MH Practically impervious Slight to severe 4,000 3,000 2,000
    8 CI, CH Semi-impervious to impervious Negligible to severe 3,500 3,000 2,000
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    Rainfall Quantity (in)
    24 HOUR RAINFALL QUANTITY
    2 YEAR 10 YEAR 100 YEAR
    Boston, MA 3 5 8
    Chicago, IL 2.75 4.25 7
    Cincinnatti, OH 2.75 4 5.75
    Cleveland, OH 2.25 3.5 5.25
    Des Moines, IA 3 4.5 7
    Detriot, MI 2.25 3.25 5.25
    Indianapolis, IN 2.75 4 5.75
    Kansas City, KS 3.5 5.5 8.75
    Madison, WI 2.75 4 6.5
    Montreal, QC 2.18 3.11 4.59
    New York, NY 3 5 8
    Philadelphia, PA 3 4.75 7.75
    Pittsburgh, PA 2.25 3.25 5
    Toronto, ON (Buffalo, NY) 2.25 3.5 5.5
    Washington, DC 3 4.25 8.25
    Averages 2.75 4.20 6.70

    Disclaimer: Rainfall data from NOAA's National Weather Service.

    Close
    Rainfall Quantity (mm)
    24 HOUR RAINFALL QUANTITY
    2 YEAR 10 YEAR 100 YEAR
    Boston, MA 76 127 203
    Chicago, IL 70 108 178
    Cincinnatti, OH 70 102 146
    Cleveland, OH 57 89 133
    Des Moines, IA 76 114 178
    Detriot, MI 57 83 133
    Indianapolis, IN 70 102 146
    Kansas City, KS 89 140 222
    Madison, WI 70 102 165
    Montreal, QC 55 79 117
    New York, NY 76 127 203
    Philadelphia, PA 76 121 197
    Pittsburgh, PA 57 83 127
    Toronto, ON (Buffalo, NY) 57 89 140
    Washington, DC 76 108 210
    Averages 70 107 170

    Disclaimer: Rainfall data from NOAA's National Weather Service.

    Close
    Rainfall Intensity (in)
    5 MINUTE RAINFALL
    2 YEAR 10 YEAR 100 YEAR
    Boston, MA 4 6.75 11
    Chicago, IL 5 7.25 10.25
    Cincinnatti, OH 5 7 9
    Cleveland, OH 4.25 5.25 8.75
    Des Moines, IA 5 7.75 12.5
    Detriot, MI 4 6.5 10
    Indianapolis, IN 5 7.25 10
    Kansas City, KS 5.25 8.25 13
    Madison, WI 4.75 7 10.5
    Montreal, QC 2.87 3.524 5.3
    New York, NY 4.75 7.75 12
    Philadelphia, PA 4.5 6.5 8.25
    Pittsburgh, PA 4.25 6.25 8.5
    Toronto, ON (Buffalo, NY) 3.75 6.25 9.75
    Washington, DC 4.75 6.75 9
    Averages 4.59 6.96 10.18
    Close
    Rainfall Intensity (mm)
    5 MINUTE RAINFALL
    2 YEAR 10 YEAR 100 YEAR
    Boston, MA 102 171 279
    Chicago, IL 127 184 260
    Cincinnatti, OH 127 178 229
    Cleveland, OH 108 133 222
    Des Moines, IA 127 197 318
    Detriot, MI 102 165 254
    Indianapolis, IN 127 184 254
    Kansas City, KS 133 210 330
    Madison, WI 121 178 267
    Montreal, QC 73 90 135
    New York, NY 121 197 305
    Philadelphia, PA 114 165 210
    Pittsburgh, PA 108 159 216
    Toronto, ON (Buffalo, NY) 95 159 248
    Washington, DC 121 171 229
    Averages 117 177 259
    Close
    Subgrade Soil Classification
    Boulders / Coubbles Rock, rock fill, shattered rock, boulders/cobbles
    GW, SW Well graded graves and sands suitable as granular borrow
    GP, SP Poorly graded gravels and sands
    GM, SM Silty gravels and sands
    GC, SC Clayey gravels and sands
    ML, MI Silts and sandy silts
    CL, MH Low plasticity clays and compressible silts
    CI, CH Medium to high plasticity clays
    Close
    Subgrade Soil Condition
    QUALITY OF DRAINAGE TIME TO DRAIN
    Good 1 day
    Fair 7 days
    Poor 1 month
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