For many years, permeable paving has been making an important contribution to the environmental improvements of urban development as a part of the sustainable management of drainage systems. It has helped to reduce flooding, overstressed drains, water pollution and lowered ground water levels. There have also been remarkable cost reductions - both initial and life cycle - for the overall drainage of pavements on new building and road projects. In addition, stormwater runoff from sealed pavements is also being handled effectively by adjacent areas of permeable paving. Central to the successful structural and hydraulic design of permeable block paving and its long-term use is accurate information about the infiltration performance of the pavement during its service life. This leads also to adequate proposals for monitoring and maintenance to achieve a long lasting infiltration performance on a high level.
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