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Influence Of Sediment On The Hydrological Performance Of Permeable Pavements<p> Majed Alsubih*, Scott Arthur, And Grant Wright<p> Institute For Infrastructure And Environment, Herio

Congress: 2015
Author(s): majed alsubih (edinburgh, UK)


Keyword(s): Sub-theme 4: Infrastructure development,
AbstractKEYWORDS: Permeable pavement, Hydraulic performance, sedimentation, clogging

Introduction

Permeable pavements are a key SUDS measure in the attenuation of surface runoff in urban areas (Pratt et al., 1989, Schluter, W.C., Jefferies, 2002,). Permeable pavements are also able to filter out a proportion of the pollutants that exist in surface runoff. However, despite the readily apparent benefits of permeable pavements, there is uncertainty regarding their operational performance and maintenance requirements (Abbott, C. L., and L. Comino-Mateos, 2003, Scholz and Grabowiecki, 2007, Newman, 2013,). Therefore, further studies into the performance of these pavements are required in order to obtain a better understanding of the way in which they function.

Methodology

This study is based upon laboratory work, which provides an investigation into the performance of the permeable pavements. A one meter square of permeable pavement was constructed in the hydraulics lab at Heriot-Watt University in accordance with The SUDS manual design method CIRIA C697 (CIRIA, 2007) and British Standards BS 7533:13 (BSI, 2009). This sample consists of a series of layers, with the base being 300 mm of subgrade (sand), then 350 mm of coarse aggregate, 50 mm of fine aggregate and 80 mm of block paving. The method adopted in this research is to separate the experiment into two phases. Initially, the research focuses on the short term hydrology of the pavement and the way in which water moves through the structure during a range of different rainfall events. The next phase is to investigate the retention of pollutants within the pavement structure and how much volume of water discharged would be reduced after the addition of sediments.

Results and discussion

A summary of outflow analyses is provided in Table 1. In general the pavement managed to retain more than 50% of the total rainfall from all the rain events. However, when the structure was dry prior to the start it managed to retain about 80% of the total rainfall.

Table 1: illustrates the average results from the three rainfall intensities tested.

In the first week, the pavement had only responded to the third storm as it was completely dry and able to readily absorb rainfall. In Subsequent '' wet weeks'' the response of the pavement was different, the four storms showed the same trend. The outflow continually increased by consecutive storms as shown in Figure 2. This could be explained by the fact that the structure was not dry and had not returned to the condition level of the first rain event simulation.

The moisture content of subgrade layer has been monitored during the length of the experiment. As can be seen from Figure 3 there is a significant increase in moisture content at the beginning of the experiment due to the subgrade was dry. After a period of time, the subgrade layer became almost saturated.

Conclusion

Overall, this paper seeks to present the findings of this experimental investigation into hydrological performance as well as long-term sediment performance, thereby support the main objective of investigating the way in which permeable pavements perform and possible ways to optimise their design and maintenance. 1. Abbott, C. L., and L. Comino-Mateos (2003). "In-situ hydraulic performance of a permeable pavement Sustainable Urban Drainage System." Water and Environmental Management Journal 17(3): 187-190

2. Alan Paul Newman, Douglas Aitken, Blanca Antizar-Ladislao (2013). ‘’Stormwater quality performance of a macro-pervious pavement car park installation equipped with channel drain based oil and silt retention devices ‘’ Water research (2013) 1-1 0

3. British Standards Institution (2009) Pavements constructed with clay, natural stone or concrete pavers. Guide for the design of permeable pavements constructed with concrete paving blocks and flags, natural stone slabs and setts and clay pavers, BS 7533-13-2009, BSI

4. CIRIA 2007. The SUDS Manual (C697), London: CIRIA

5. Pratt, C. J., Mantle, J.D.G., Schofield, P.A. (1989). "Urban stormwater reduction and quality improvement through the use of permeable pavements". Water science and technology 21(8) 769

6. Schluter, W.C., Jefferies, 2002. ‘’Modelling the outflow from a porous pavement’’. Urban Water 4, 245-253

7. Scholz, M. and Grabowiecki, P. (2007). "Review of permeable pavement systems". Building and Environment, (42) 3830–3836

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