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Water 2014, 6(8), 2353-2366; doi:10.3390/w6082353

Comparing Two Methods of Determining Infiltration Rates of Permeable Interlocking Concrete Pavers

1
Stormwater Research Group, School of Science and Engineering, University of the Sunshine Coast, Maroochydore DC 4558, Australia
2
Urban Water Management, Frankfurt University of Applied Sciences, Frankfurt am Main 60318, Germany
*
Author to whom correspondence should be addressed.
Received: 30 May 2014 / Revised: 30 July 2014 / Accepted: 4 August 2014 / Published: 8 August 2014
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Abstract

Adequate infiltration through Permeable Interlocking Concrete Pavements (PICPs) is critical to their hydraulic performance. Detected by monitoring infiltration performance, reduced infiltration rates can indicate that maintenance is required. Measurement of infiltration rates has previously been problematic on PICPs because of a lack of accepted standard methodologies and the practical difficulties in modifying existing testing methodologies. On large sites, standard methodologies necessitate multiple measurements to achieve accuracy. Standard methods also contend with practical issues such as sealing the rings to the surface to prevent lateral water flow. This study examined the performance of two PICP surface infiltration rate measurement methods: a modified double-ring infiltrometer (DRIT), and a specially designed rainfall simulation infiltrometer (RSIT). A positive correlation (R2 = 0.85) of results was found between the two, demonstrating that the RSIT was comparable to the DRIT. The modified DRIT produced surface infiltration results approximately 60% higher than the RSIT results. The RSIT provided lower variation between tests, requiring fewer measurements in large sites whilst still maintaining accuracy, thereby improving testing efficiency. The new RSIT method also eliminates some of the practical difficulties with existing methodologies such as unrealistic pressure heads artificially increasing infiltration rates, and the use of sealant under test measurement infiltration rings.
Keywords: Permeable Interlocking Concrete Pavements; clogging; infiltration testing; water sensitive urban design Permeable Interlocking Concrete Pavements; clogging; infiltration testing; water sensitive urban design
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

W.B.Nichols, P.; Lucke, T.; Dierkes, C. Comparing Two Methods of Determining Infiltration Rates of Permeable Interlocking Concrete Pavers. Water 2014, 6, 2353-2366.

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