Pervious Pavers: Where is the Perviousness?
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1 Pervious Pavers: Where is the Perviousness? Elizabeth (Betsy) Pappas Research Hydraulic Engineer Chi-hua Huang Soil Scientist United States Department of Agriculture Agricultural Research Service National Soil Erosion Research Laboratory West Lafayette, IN USA
2 USEPA Stormwater Phase II Post-Construction Runoff Control Minimum Control Measure BMPS Include: Non-structural Planning / zoning around sensitive areas Site-based minimization of disturbance Structural Retention / detention Infiltration Vegetative
3 Pervious Pavement Types Porous concrete Grass pavers Gravel pavers Permeable interlocking concrete pavers Bricks Concrete grid pavers Recycled chipped tire surface
4 Causes of Decreased Infiltration Rates in Pervious Paver Systems Clogging by: Silt and clay Organic matter Proximity to erodible surfaces Proximity to landscaping Oil and grease Wear of paver High traffic counts Improper material
5 Previous Research Infiltration rates of permeable paver systems may be significantly improved by performing maintenance (Bean et al., 2007) In some cases, maintenance can return paver system to original infiltration rate. (Balades et al., 1995;) Removal of top mm and backfill with clean sand to original grade. (Gerrits and James, 2002) Permeable Interlocking Concrete Pavers * Single Ring Infiltrometer Test * *Used with Permission: Bean, E.Z., Hunt, W.F., and Bidelspach, D.A. (2007) Field survey of permeable pavement surface infiltration rates. J. Irrigation and Drainage Engr. 133(3),
6 Maintenance of Pervious Paver Block Systems Maintenance Methods Vacuum Vacuum Sweep Sweep Powerwash Powerwash with Suction
7 Objectives Evaluate changes in runoff and infiltration rates from two paver block systems receiving runon from an erodible surface under repeated rainfall events. Determine the importance of infiltration in paver blocks themselves vs infiltration in the spaces between them.
8 Example Pervious Paver Schematic Adapted from: Interlocking Concrete Pavement Institute Residential Driveway
9 Schematic of Experimental Apparatus Silt loam θ vi = 18% BD 1.2 g/cm cm Paver
10 Paver Boxes 100 cm 60 cm 20 cm Large Block (22.5 x 15.0 x 5.5 cm) Small Block (18.0 x 10.0 x 4.0 cm)
11 Rainfall Simulation 11 rainfall events 30 mm/hr for 60 min 5-yr return period hrs between events Timed Samples Surface Run-on Surface Runoff Deep Infiltration (20cm) Rainfall Rate
12 Run-on Run-on Water Rate (mm/hr) Run-on Water Rate Run-on Sediment Rate Run-on Sediment Rate (g/min) Time (min)
13 Sedimentation of Paver Surface Before Rain After Rain
14 Steady State Deep Infiltration Rates Impermeable Block Impermeable Block 95% Confidence Permeable Block Permeable Block 95% Confidence Deep Infiltration Rate (mm/hr) R 2 = 0.91 R 2 = y = -lnx+b Event
15 Steady State Runoff Rates Surface Runoff Rate (mm/hr) Impermeable Block Impermeable Block 95% Confidence Permeable Block Permeable Block 95% Confidence R 2 = R 2 = Y = lnx+b Event
16 Paver Infiltration Tests Mariotte Bottle Constant Head 7.6 cm Plumber s Putty 8 mm Single Paver Collection Bottle
17 Paver Infiltration Tests Paver Type Permeable Block Before Rain Permeable Block After Rain and Sweeping Impermeable Block Before Rain Average Steady State Infiltration Rate (cm/hr) <0.01
18 Conclusions Measured deep infiltration rates of pervious paver block systems were shown to decrease from 87% to 3% of total water input when receiving precipitation and run-on from an erodible surface. Maintenance may not be effective in restoring infiltration rates of individual paver blocks. Infiltration is most important in the open spaces between paver blocks. The benefit of using a permeable paver block over using a more durable impermeable paver block is questionable. There may be implications to applicability of porous concrete?
19 Thank You
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