Infiltration and retention of rain water are used to reduce the runoff peaks in the sewerage system and in the receiving waters. At the University of Essen the efficiency of green roofs and porous pavements has been investigated. A mathematical model has been applied which allows a fast simulation for the runoff and respectively for the seepage. For linear systems the Fourier transform allows the calculation of transfer functions from measured data.

Infiltration, retention, green roofs, porous pavements, Fourier transform, transfer functions
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© IWA Publishing 1997
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